CN105865877A - Non-cohesive soil sample filling mold of geotechnical triaxial test - Google Patents

Abstract

The purpose of the present invention is to provide a non-cohesive soil sample loading mold for geotechnical triaxial testing, so as to solve the problems in the prior art that the mold is easy to deform and move, and the sample is difficult to form and easy to deform. The invention discloses a non-cohesive soil sample loading mold for geotechnical triaxial test, which comprises a circular mold and a clamp. The circular mold is provided with an accommodation cavity, and the inner wall of the circular mold is provided with grid lines for reducing excessive local negative pressure. The mold comprises a first semicircle mold and a second semicircle mold, the end of the first semicircle mold is provided with a protrusion, the end of the second semicircle mold is provided with a groove adapted to the protrusion of the first semicircle mold, and the first semicircle The ends of the die and the second semi-circle die are abutted against each other, and the clamp is set outside the round die for fastening the first and second semi-circle dies. The beneficial effect of the non-cohesive soil sample loading mold for geotechnical triaxial test provided by the invention is that the mold is not easily deformed and shifted, the sample is easily formed and the sample is not easily deformed after forming.

Description

Non-cohesive soil sample loading mold for geotechnical triaxial test

technical field

The invention relates to the field of test devices, in particular to a non-cohesive soil sample loading mold for geotechnical triaxial tests.

Background technique

Geotechnical triaxial test is a method to measure the shear strength of soil. Under a certain fixed surrounding pressure, the axial pressure of the sample is gradually increased until the sample is destroyed. Based on this, the Mohr stress circle can be drawn. The same soil sample is tested under different surrounding pressures, and a set of Mohr stress circles can be obtained, and the common tangents of these Mohr stress circles can be obtained to obtain the envelope of the shear strength, and thus the soil sample can be obtained index of shear strength. Geotechnical triaxial tests require soil samples to be standard cylindrical, especially for non-cohesive soils. Due to the very weak bonding ability between soil particles, it is difficult for non-cohesive soils to form standard cylindrical samples in the natural state, and the preparation of samples It has a great influence on the accuracy of test results, so the demand for forming molds for cohesive soil samples is put forward.

First of all, the non-cohesive soil sample loading mold for geotechnical triaxial test in the prior art uses a plexiglass container, and the plexiglass mold will be deformed under the action of the internal and external pressure difference.

Secondly, the plexiglass mold in the prior art is designed in splits, the joint surface of the plexiglass mold is smooth, and there is no limit design, so after loading the soil sample, the glass mold is prone to relative misalignment, which will cause the sample to deform, and the sample is formed up to Less than the test standard.

Thirdly, the inner surface of the plexiglass mold is smooth, and when the sample is under negative pressure, the intensity of negative pressure received by different positions of the sample is inconsistent, resulting in the sample being easily deformed.

To sum up, the problems existing in the non-cohesive soil sample loading mold for geotechnical triaxial testing in the prior art are: the mold is easily deformed and shifted, and the sample is difficult to form and easily deformed.

Contents of the invention

The object of the present invention is to provide a non-cohesive soil sample loading mold for geotechnical triaxial testing to solve the problems in the prior art that the mold is easy to deform and move, and the sample is difficult to form and easy to deform.

The invention discloses a non-cohesive soil sample loading mold for geotechnical triaxial test, which comprises a circular mold and a clamp, the circular mold is provided with an accommodation cavity, and the inner wall of the circular mold is provided with a grid for reducing excessive local negative pressure lines, the round mold includes a first semicircular mold and a second semicircular mold, the end of the first semicircular mold is provided with a protrusion, and the end of the second semicircular mold is provided with a The groove that the protrusion fits, the ends of the first semi-circular mold and the second semi-circular mold abut against each other, and the clip is set outside the circular mold for fastening the first semi-circular mold and the second semi-circular mold. Describe the second semicircle mold.

Furthermore, the protrusion includes a first protrusion and a second protrusion, and the first protrusion and the second protrusion are symmetrically arranged at both ends of the first semicircular mold.

Furthermore, the groove includes a first groove and a second groove, and the first groove and the second groove are symmetrically arranged at both ends of the second semicircular mold.

Furthermore, both the first semicircular mold and the second semicircular mold are provided with an inner layer and an outer layer, and the first protrusion and the second protrusion are arranged on the inner layer of the first semicircular mold Above, the first groove and the second groove are arranged on the inner layer of the second semicircular mold.

Furthermore, the upper end and the lower end of the circular die are fitted with clamps.

Furthermore, the bottom of the round mold is provided with a boss for carrying the clamp.

Furthermore, the middle part of the inner layer of the first semi-circular mold is provided with a gas collection groove, and the middle part of the gas collection groove is provided with a negative pressure suction hole connected to a negative pressure controller.

Furthermore, the grid pattern includes intersecting vertical patterns and circular patterns.

Furthermore, the circular pattern includes a first circular pattern, a second circular pattern and a third circular pattern whose pattern density increases sequentially from the top to the bottom of the circular mold.

Furthermore, the circular mold is made of carbon steel.

In conjunction with the above technical solutions, the first, the non-cohesive soil sample loading mold for geotechnical triaxial test provided by the present invention is made of carbon steel material, which has high strength and is not easily deformed; second, the first semicircular mold and The end of the second semi-circular mold is provided with protrusions and grooves. This mortise and tenon connection can ensure that the non-cohesive soil sample loading mold for geotechnical triaxial testing will not be deformed during use; The grid-like structure is conducive to the circulation of gas in the circular mold, ensuring that the test samples in the circular mold are subjected to uniform pressure at different positions, so that the prepared samples are not easily deformed, and the sample forming is simple.

In summary, the beneficial effects of the non-cohesive soil sample loading mold for geotechnical triaxial testing provided by the present invention are: the mold is not easy to deform, the sample is easy to form and the sample is not easily deformed after forming.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

Fig. 1 is the front view of the non-cohesive soil sample loading mold for geotechnical triaxial test provided by the invention;

Fig. 2 is the top view of A-A direction of Fig. 1;

Fig. 3 is the structural representation of the first semicircle mold and the second semicircle mold;

Fig. 4 is the structural representation of clip;

Fig. 5 is a schematic diagram of the structure of the grid pattern.

reference sign

1-circular mold; 2-first semicircular mold; 3-second semicircular mold;

4-Protrusion; 5-Groove; 6-Clamp;

7-grid texture; 8-boss; 9-accommodating cavity;

21-inner layer; 22-outer layer; 41-first protrusion;

42-the second protrusion; 51-the first groove; 52-the second groove;

71-Vertical lines; 72-Ring lines; 211-Negative pressure suction holes;

212-gas collection groove; 721-the first ring pattern; 722-the second ring pattern;

723-Third circular pattern.

detailed description

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

As shown in Fig. 1 , Fig. 2 , Fig. 3 and Fig. 4 , the present invention discloses a non-cohesive soil sample loading mold for geotechnical triaxial test, which includes a round mold 1 and a clamp 6 . The hoop 6 is set on the round die 1 for fastening the round die 1 .

As shown in Figure 4, the hoop 6 is set to an annular structure consisting of two semi-circular rings, one end of the two semi-circular rings is hinged, the two semi-circular rings can rotate around the hinged position, and the other half of the semi-circular rings One end is helically connected by a connecting shaft, and the effect of fastening or loosening is achieved by tightening or loosening the connecting shaft. Both the upper end and the lower end of the round die 1 are sleeved with clamps 6 .

Furthermore, as a specific possible implementation, a screw hole is opened at the end of one semi-circular ring connected to the connecting shaft, and a negative pressure suction hole 211 is opened at the end of the other semi-circular ring connected to the connecting shaft. .

Furthermore, as a specific possible implementation manner, the connecting shaft is provided with threads, and the connecting shaft is screwed to the semi-circular ring provided with screw holes.

Furthermore, as a specific possible implementation, the end of the connecting shaft is provided with a handle, and the handle abuts against the semi-circular ring with the negative pressure suction hole 211, and the connecting shaft keeps moving forward during the tightening process. Push in and lock both half rings.

Furthermore, as a specific possible implementation manner, a round hole is opened in the middle of the handle connecting the shaft, and the round hole is used for holding by the operator's hand.

Furthermore, as a specific implementation manner, the clip 6 is made of stainless steel.

Furthermore, as a specific implementation manner, the connecting shaft is made of stainless steel.

The round mold 1 is provided with an accommodating chamber 9, and the accommodating chamber 9 is used for loading samples. The round mold 1 includes a first semicircular mold 2 and a second semicircular mold, and the ends of the first semicircular mold 2 and the second semicircular mold abut against each other. The bottom of the mold 1 is provided with a boss 8 for carrying the second clip 6 . The middle part of the inner layer 21 of the first semicircular mold 2 is provided with a negative pressure suction hole 211 for connecting a negative pressure controller. Both the first semi-circular mold 2 and the second semi-circular mold are provided with an inner layer 21 and an outer layer 22 which are engaged with each other.

The diameter of the boss 8 is greater than that of the round die 1 , and the hoop 6 is lapped on the boss 8 . The boss 8 is arranged on the periphery of the bottom of the round mold 1. On the one hand, the boss 8 can carry the second clamp 6, and on the other hand, it can stabilize the non-cohesive soil sample loading mold for the geotechnical triaxial test to prevent the non-cohesive soil from being loaded in the geotechnical triaxial test. The sample mold is dumped.

The inner layer 21 of the first semicircle mold 2 abuts against the inner layer 21 of the second semicircle mold, the outer layer 22 of the first semicircle mold 2 and the outer layer 22 of the second semicircle mold abut, the first semicircle mold 2 and the second semicircle mold The inner layer 21 of the semicircular mold forms a closed ring, and the outer layer 22 of the first semicircular mold 2 and the second semicircular mold forms a closed annular.

The reason why the round mold 1 in the non-cohesive soil sample loading mold for geotechnical triaxial test provided by the present invention is provided with the outer layer 22 and the inner layer 21 is: combined use, convenient installation and disassembly, and simple processing.

The end of the first semicircle mold 2 is provided with projection 4, and projection 4 is arranged on the inner layer 21 of the first semicircle mold 2, and the end of the second semicircle mold is provided with the projection 4 suitable for the first semicircle mold 2. matching groove 5.

The protrusion 4 includes a first protrusion 41 and a second protrusion 42 , and the first protrusion 41 and the second protrusion 42 are symmetrically arranged at both ends of the first semicircular mold 2 . The first protrusion 41 and the second protrusion 42 are arranged on the inner layer 21 of the first semicircular mold 2,

The groove 5 includes a first groove 51 and a second groove 52, and the first groove 51 and the second groove 52 are symmetrically arranged at both ends of the second semicircular mold. The first groove 51 and the second groove 52 are disposed on the inner layer 21 of the second semicircular mold.

It should be noted that: the first protrusion 41 cooperates with the first groove 51 , and the second protrusion 42 cooperates with the second groove 52 . Round mold 1 can avoid the radial direction between the first semicircle mold 2 and the second semicircle mold under the situation that the first protrusion 41 and the second protrusion 42 cooperate with the first groove 51 and the second groove 52 respectively. movement, ensuring good positioning.

The non-cohesive soil sample loading mold for geotechnical triaxial test provided by the present invention has the beneficial effect of setting protrusions 4 and grooves 5 in that: the protrusions 4 and grooves 5 are fixed by tenon joint, which can ensure the non-cohesive soil sample loading of geotechnical triaxial test The precise positioning of the mold can avoid the misalignment and deformation of the non-cohesive soil sample loading mold in the geotechnical triaxial test during the working process.

It should be noted that in the geotechnical triaxial sample, the latex film covering the soil sample is set on the test base of the triaxial pressure chamber platform. The upper part of the mold is loaded with test soil and compacted according to the test standard for sample preparation, then a sample cap is placed on the upper part, and the non-cohesive soil sample loading mold for the triaxial test is located between the sample cap and the test base of the pressure chamber platform. The upper part of the sample cap is provided with a drainage pipeline and a control valve, and the outside of the pressure chamber base is provided with a pore water pressure sensor and a control valve. When saturating the test sample of the non-cohesive soil sample mold in the triaxial test, the pore water pressure valve is first opened, carbon dioxide gas is introduced first, and the air in the soil sample is exhausted, and then the air-free water flows from the bottom of the test sample. Gradually flow into the upper sample cap. After the water immersion is completed, open the drain valve located at the upper end of the sample cap to drain the water and saturate the sample. A filter paper and a water-permeable stone moistened with pure water are arranged on the top of the test sample. The gap between the sample cap and the triaxial test soil sample is sealed by the clamping effect of the rubber mold. The gap between the pressure chamber platform test base and the triaxial test soil sample is sealed by the clamping effect of the rubber mold.

As shown in FIG. 1 , the inner layer 21 of the first semicircular mold 2 is provided with a negative pressure suction hole 211 in the middle for communicating with a negative pressure controller.

It should be noted that when preparing samples, the latex film covering the soil sample must be adsorbed to the inner wall of the triaxial test non-cohesive soil sample loading mold, so as to facilitate the filling of the test soil and compact sample preparation. , needs to use the negative pressure controller, the suction nozzle of the negative pressure controller is arranged on the position corresponding to the negative pressure suction hole 211 of the outer layer 22 of the first semicircular mold 2 . When vacuuming the non-cohesive soil sample loading mold for geotechnical triaxial test, the air in the round mold 1 first passes through the negative pressure suction hole 211, and then is discharged to the geotechnical triaxial test non-cohesive soil by the suction nozzle of the negative pressure controller. Cohesive soil loading mold exterior.

The air-collecting groove 212 is horizontally arranged in the middle of the axial direction of the non-cohesive soil sample loading mold of the geotechnical triaxial test. The negative pressure suction hole 211 in the middle part of the first semicircular mold 2 is located in the middle part of the air collecting groove 212 .

The reason for setting the gas collection groove 212 is: the negative pressure suction hole 211 in the middle part of the first semicircular mold 2 is the gas outlet of the non-cohesive soil sample loading mold for the geotechnical triaxial test, and the gas collection groove is set near the negative pressure suction hole 211 The groove 212 makes the air between the latex film and the mold flow through the grid dents to be discharged there concentratedly.

As shown in FIG. 5 , the inner wall of the round mold 1 is provided with grid lines 7 for reducing excessive local negative pressure. The grid lines 7 include intersecting vertical lines 71 and circular ring lines 72 .

Furthermore, as a specific possible implementation, the grid lines 7 are set as grid-shaped indentations.

The main purpose of the grid pattern 7 is to provide passages for air circulation in the non-cohesive soil sample loading mold of the geotechnical triaxial test. When the sample in the non-cohesive soil sample loading mold of the geotechnical triaxial test was subjected to backpressure treatment, the air in the non-cohesive soil sample loading mold of the geotechnical triaxial test was discharged to the Outside the non-cohesive soil sample loading mold for geotechnical triaxial test, the air pressure in different positions in the non-cohesive soil sample loading mold for geotechnical triaxial test is not balanced at this time, and the air near the negative pressure suction hole 211 in the middle of the first semicircular mold 2 It can be discharged quickly, but the air far away from the negative pressure suction hole 211 in the middle of the first semicircular mold 2 is difficult to discharge due to the lack of necessary circulation channels. 7. The circulation channel provided is smoothly discharged to the outside of the non-cohesive soil sample loading mold for geotechnical triaxial test, so that the prepared test sample is evenly stressed and stable and not easily deformed.

The circular pattern 72 includes a first circular pattern 721 , a second circular pattern 722 and a third circular pattern 72 whose density increases sequentially from the top to the bottom of the circular mold.

The reason for setting the first circular pattern 721, the second circular pattern 722 and the third circular pattern 72 is that the air at the bottom of the non-cohesive soil sample loading mold for the geotechnical triaxial test is more than the air at the upper part, which is located in the non-viscous soil of the geotechnical triaxial test. The gas at the bottom of the soil sample mold is difficult to discharge, so it is necessary to set up denser fluid channels to assist the air discharge at the bottom. The more reasonable setting method is: from the top to the bottom of the round mold, the first circular pattern 721, the second circular pattern The densities of 722 and the third ring pattern 72 increase sequentially.

The reason for setting the vertical lines is that the ring lines 72 are arranged in the axial direction of the non-cohesive soil sample loading mold of the geotechnical triaxial test, and there is no passage between the ring lines, so setting the vertical lines 71 can connect the ring texture72. The non-cohesive soil sample loading mold for geotechnical triaxial test can realize the rapid circulation of gas in the non-cohesive soil sample loading mold for geotechnical triaxial test under the combined action of the ring lines 72 and the vertical lines 71 .

Furthermore, as a specific implementation manner, the round mold 1 is made of carbon steel.

The beneficial effect of the circular mold 1 being made of carbon steel is that the traditional glass circular mold 1 is easily deformed under the action of the pressure difference between the inner and outer molds for non-cohesive soil sample loading in the geotechnical triaxial test, and has low strength. Carbon steel has high strength, high toughness, corrosion resistance and excellent characteristics, so it can adapt to the situation where the triaxial sample loading mold works under various pressures.

The operation process of the triaxial test adopting the geotechnical triaxial test non-cohesive soil loading mold provided by the invention is as follows:

1. Prepare 500g of ready-to-use mixed sand, take out a quarter of the total mass of the sample and put it into four crucibles and mix it with 75g of water to form sand with a water content of 15%. The balls are evenly dropped into the crucible, and then sealed with a plastic film to ensure that the moisture content of the sample remains unchanged.

2. Prepare a rubber film for sealing. The rubber film is set in a circular shape, and the length of the rubber film in the axial direction is kept at 10 mm to ensure that the edge of the rubber film is smooth, without jagged, and without inclination. And cut a rubber ring with a width of 5mm, and then conduct a rubber film leakage test. Tighten one side of the rubber film with a rubber ring, fill it with water, and tie the other side with a rubber ring, and squeeze the rubber with both hands in turn. Check whether there is water leakage in all directions of the membrane. After the inspection, remove the rubber band to release the water and wipe it clean.

3. The side edge of the pressure chamber platform test base is evenly coated with a layer of Vaseline to prevent the rubber film from leaking, and then the permeable stone and filter paper wetted with distilled water are placed on the pressure chamber platform test base in turn, and then the prepared rubber film Put it on the base of the pressure chamber, and then use a rubber ring to put the rubber film on the test base of the pressure chamber platform. The tightness of the vaseline and the rubber ring can fully ensure that the contact surface between the rubber film and the sample base is airtight.

4. Fix the non-cohesive soil sample loading mold for the geotechnical triaxial test on the test base of the pressure chamber platform, then tighten the rubber film on the mold and put it on the mold to make the rubber film inside the mold flat, and then use the suction ball to The air between the mold and the rubber film is sucked out, so that the two fit tightly.

5. Mix the prepared four small portions of sand materials with a spoon and put them into the mold slowly and evenly. Put the filter paper and permeable stone moistened with pure water on the top of the sample in turn, and then put the surrounding area coated with petroleum jelly. Put the sample cap on the sand sample, open the pore water pressure valve and the measuring tube valve, let the water flow in slowly from the bottom of the sample, remove the air bubbles between the sample and the rubber film, close the pore water pressure valve and the measuring tube valve. Open the drain valve to fill the sample cap with water, then wrap it with the rubber film that is reversed on the mold, and finally tie it tightly with a rubber ring. After the sample is completed, use a back pressure controller to create a negative pressure inside the sample to ensure that the sample can stand after the mold is removed, and then gently remove the split mold to check whether the height and diameter of the sample meet the test requirements.

The beneficial effects of the non-cohesive soil sample loading mold for geotechnical triaxial test provided by the invention are:

First, because the non-cohesive soil sample loading mold for geotechnical triaxial test provided by the present invention is made of carbon steel material, the strength of carbon steel material is large and not easily deformed, so the sample loading mold for triaxial test is not easy to deform.

Second, since the non-cohesive soil sample loading mold for geotechnical triaxial test provided by the present invention is provided with protrusions and grooves at the ends of the first semicircle mold 2 and the second semicircle mold, the mode of this mortise and tenon connection can ensure geotechnical triaxial The non-cohesive soil sample loading mold for the axial test does not deform during use, so that the prepared sample is not easily deformed.

The 3rd, because the non-cohesive soil loading mold of geotechnical triaxial test provided by the present invention is provided with grid-like structure inside the round mold, the grid-like structure helps the circulation of gas in the round mold 1, guarantees the air in the round mold 1. The test sample receives uniform pressure at different positions, the prepared sample is not easily deformed, and the sample forming is simple.

In summary, the beneficial effects of the non-cohesive soil sample loading mold for geotechnical triaxial testing provided by the present invention are that the mold is not easily deformed, the sample is easily formed and the sample is not easily deformed after forming.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or to part or all of them.

Claims (10)

1. a cohesive soil sample loading mold for geotechnical triaxial test, is characterized in that, comprises round die (1) and clip (6), and described round die (1) is provided with accommodating cavity (9), and described round die (1) is provided with accommodating cavity (9), and The inner wall of the mold (1) is provided with grid lines (7) for reducing excessive local negative pressure. The circular mold (1) includes a first semicircular mold (2) and a second semicircular mold (3). The end of the semicircle mold (2) is provided with a protrusion (4), and the end of the second semicircle mold (3) is provided with a protrusion (4) adapted to the first semicircle mold (2). Groove (5), the ends of the first half-round die (2) and the second half-round die (3) abut against each other, and the clamp (6) is set outside the round die (1) for tight Fixing the first semicircular mold (2) and the second semicircular mold (3). 2. geotechnical triaxial test non-cohesive soil sampling mold according to claim 1, is characterized in that, described protrusion (4) comprises first protrusion (41) and second protrusion (42), and described The first protrusion (41) and the second protrusion (42) are symmetrically arranged at both ends of the first semicircular mold (2). 3. geotechnical triaxial test non-cohesive soil sampling mold according to claim 2, is characterized in that, described groove (5) comprises first groove (51) and second groove (52), and described The first groove (51) and the second groove (52) are symmetrically arranged at both ends of the second semicircular mold (3). 4. geotechnical triaxial test non-cohesive soil sampling mold according to claim 3, is characterized in that, described first semicircle mold (2) and described second semicircle mold (3) are all provided with inner layer (21 ) and the outer layer (22), the first protrusion (41) and the second protrusion (42) are arranged on the inner layer (21) of the first semicircular mold (2), the first The groove (51) and the second groove (52) are arranged on the inner layer (21) of the second semicircular mold (3). 5. The non-cohesive soil sample loading mold for geotechnical triaxial test according to claim 1, characterized in that, the upper end and the lower end of the circular mold (1) are all sleeved with clamps (6). 6. The non-cohesive soil sample loading mold for geotechnical triaxial test according to claim 1, characterized in that, the bottom of the round mold (1) is provided with a boss for carrying the clamp (6). 7. geotechnical triaxial test non-cohesive soil sample loading mold according to claim 1, is characterized in that, the middle part of the inner layer (21) of described first semicircle mold (2) is provided with gas collection groove (212) , the central part of the gas collection groove (212) is provided with a negative pressure suction hole (211) connected to a negative pressure controller. 8. The non-cohesive soil sample loading mold for geotechnical triaxial test according to claim 1, characterized in that, the grid lines (7) include intersecting vertical lines (71) and ring lines (72). 9. geotechnical triaxial test non-cohesive soil sample loading mold according to claim 8, is characterized in that, described annular grain (72) comprises the first annular grain that increases successively from the top of circular die to the bottom grain density (721), the second circular pattern (722) and the third circular pattern (723). 10. The non-cohesive soil sample loading mold for geotechnical triaxial test according to claim 9, characterized in that, the circular mold (1) is made of carbon steel.