CN107884246A - Solution cavity preparation method in a kind of geomechanical model test - Google Patents

Abstract

The present invention relates to solution cavity preparation method in a kind of geomechanical model test, this method mainly pre-buried realizes different shapes and sizes in geomechanical model test body, the automatic forming of position solution cavity by the way that ice body is prefabricated.Design is required according to required solution cavity geomery and make solution cavity mould first with mold materials；Clear water is then injected into, and is placed on carrying out freeze forming during freezing is set, after its freeze forming, form removal, which is taken out, can obtain solution cavity ice body model；Prefabricated ice body model surface is uniformly then smeared into vaseline；The ice body model made finally is embedded into test body specified location, the geomechanical model test body of built-in solution cavity is can obtain after its thawing.Solve the problem tested in geomechanical model test and put solution cavity in vivo, by prefabricated pre-buried ice body, the characteristic to be disappeared using its freeze forming, thawing, realize solution cavity built in fast simple making in geomechanical model test.

Description

A method for making karst caves in geomechanical model tests

technical field

The invention belongs to the field of geomechanics model tests, and specifically refers to a method for pouring an ice body model with a mold and pre-embedding it into a test body during the geomechanics model test, so as to realize the automatic formation of the built-in karst cave of the test body.

Background technique

Geomechanical model test is one of the important research methods in the field of geotechnical engineering research, and it refers to a physical simulation method to conduct scale-down research on an engineering geological structure based on a certain similarity principle. In the current stage of geotechnical engineering construction in my country, the geomechanics model test can provide a more intuitive simulation of physical phenomena, which can not only reveal the influence of engineering construction on the stability of rock and soil mass, but also reveal the influence of geological structure on engineering excavation law. Moreover, with the improvement of test measurement technology in recent years, some research topics in geomechanics model tests have entered the quantitative analysis stage from the qualitative analysis stage. Among them, how to truly simulate complex geological structures puts forward higher requirements for the accuracy of geomechanical model tests.

Contents of the invention

The technical problem to be solved by the present invention is how to quickly and efficiently form the built-in karst cave of the test body in the geomechanics model test. The invention provides a method for making karst caves in a geomechanical model test. The method mainly realizes the automatic formation of karst caves with different shapes, sizes and positions in a geomechanical model test body through prefabricated and pre-embedded ice bodies.

To achieve the above object, the technical scheme of the present invention is as follows:

A method for making a karst cave in a geomechanical model test, comprising the following steps:

Step 1: Make an ice mold according to the shape of the cave;

Step 2 injecting liquid into the ice mold, and placing the liquid-injected ice mold in the freezing device;

In step 3, a hard ice model is to be formed, and the mold is removed to obtain a prefabricated cave model;

Step 4 Apply a protective layer outside the prefabricated karst cave model; then place it on the designated position of the test body; and quickly cover the prefabricated karst cave model with the test body for filling and compaction, so as to prevent the cave from collapsing after the ice body melts, and wait for the ice body to collapse. After all the water is melted, the water seeps out of the test body under the action of gravity, and a geomechanical model test body with a built-in karst cavity is obtained.

Further, the ice body mold described in step 1 includes an upper mold and a lower mold, and the upper mold and the lower mold are connected through a connecting piece, and a sealing ring is provided at the connected position; a liquid injection mold is provided on the upper mold. Tube.

Further, lug plates are provided at the connecting position of the upper mold and the lower mold, and the lug plates are connected by bolts to form a mold cavity.

The protective layer described in step 3 is to smear vaseline to reduce damage to the ice body during operation, and to weaken the contact between the ice body and air, thereby reducing its melting speed.

The freezing equipment includes but is not limited to refrigerators and cold storages.

Further, in step 1, metal mold materials or non-metal mold materials are used to design and manufacture ice pouring molds according to the shape and size requirements of the cave. The mold not only has good sealing performance, but also has high molding efficiency and is easy to operate Easy to use, strong shell, no deformation and damage at low temperature.

Further, the liquid can be frozen below zero degrees Celsius.

The beneficial effects of the present invention are as follows:

The invention relates to a method for making karst caves in a geomechanical model test. The method mainly realizes the automatic formation of karst caves with different shapes, sizes and positions in a geomechanical model test body through prefabricated and pre-embedded ice bodies. Firstly, use the mold material to design and make the cave mold according to the required shape and size of the cave; then inject clean water and place it in the freezing setting for freezing and forming. After it is frozen and formed, remove the mold and take it out to get the cave ice model ; Then apply vaseline evenly on the surface of the prefabricated ice model; finally, pre-embed the prepared ice model into the designated position of the test body, and after it melts, the geomechanical model test body with built-in karst cave can be obtained. The present invention studies a method for making karst caves in geomechanical model tests, which solves the problem of built-in karst caves in test bodies in geomechanical model tests, and realizes geological In the mechanical model test, the built-in karst cave can be made quickly and easily. Compared with previous studies, the invention is easy to operate, environmentally friendly, and has good application prospects.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application, and do not constitute improper limitations to the present application.

Fig. 1 is a schematic diagram of a cave ice mold provided by the present invention.

Fig. 2 is a schematic diagram of the cave ice model provided by the present invention.

Fig. 3 is a schematic diagram of the pre-embedded formation of the cave ice model provided by the present invention.

In the figure: 1-liquid injection pipe, 2-upper template, 3-ear plate, 4-lower template, 5-sealing ring, 6-bolt, 7-mold cavity, 8-karst cave ice model, 9-test body , 10- test body built-in cave cavity.

Detailed ways

It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

As introduced in the background technology, and with the improvement of test measurement technology in recent years, some research topics in geomechanics model tests have entered the quantitative analysis stage from the qualitative analysis stage. Among them, how to truly simulate complex geological structures puts forward higher requirements on the accuracy of geomechanical model tests. In order to solve the above technical problems, the present invention proposes a method for making karst caves in geomechanical model tests. It is suitable for geomechanical model tests and has achieved good application results.

In a typical implementation of the present application, as shown in Figures 1 to 3, a method for making a karst cave in a geomechanical model test includes the following steps:

1) As shown in Figure 1, use metal mold materials or non-metal mold materials to design and manufacture ice casting molds according to the shape and size requirements of the cave. The mold is mainly composed of upper template 2 and lower template 3. The ear plates 3 are connected by bolts 6, and the joints are sealed with rubber sealing rings 5 to prevent water leakage. The mold not only has good airtightness, but also has high molding efficiency, and is easy to operate, and the shell is firm, and will not be deformed or damaged at low temperatures.

In Figure 1, the shape of the upper template and the lower template is hemispherical, forming a spherical structure when they are combined; the upper template and the lower template can also be designed into other shapes according to actual needs.

2) As shown in Figure 1, after the mold is made and assembled, use the liquid injection pipe 1 to inject clean water (clear water is the best choice) into the mold, and be careful not to fill it up, so as not to change the volume of the clear water during freezing and freezing, causing The mold is under too much force. Then place the water-filled mold in a refrigerator, cold storage and other freezing equipment for freezing and forming. After 48 hours, a relatively hard ice body will be formed, and the mold will be removed to obtain a prefabricated spherical cave ice model.

3) As shown in Figure 2, the surface of the prefabricated spherical cave ice model 8 is evenly coated with vaseline to reduce the damage of the ice body during operation, and weaken the contact between the ice body and air, thereby reducing its melting speed.

4) As shown in Figure 3, bury the prepared spherical karst cave ice model in the designated position of the test body 9, and quickly fill and compact the test body overlying the ice body to prevent the cave from collapsing after the ice body melts, and wait for the ice body to collapse. After the body is completely melted, water seeps out of the test body under the action of gravity, and the geomechanics model test body with built-in karst cavity 10 is obtained.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, there may be various modifications and changes in the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims (7)

1. a method for making karst caves in a geomechanical model test, is characterized in that, comprises the following steps: Step 1: Make an ice mold according to the shape of the cave; Step 2 injecting liquid into the ice mold, and placing the liquid-injected ice mold in the freezing device; In step 3, a hard ice model is to be formed, and the mold is removed to obtain a prefabricated cave model; Step 4 Apply a protective layer outside the prefabricated karst cave model; then place it on the designated position of the test body; and quickly cover the prefabricated karst cave model with the test body for filling and compaction, so as to prevent the cave from collapsing after the ice body melts, and wait for the ice body to collapse. After all the water is melted, the water seeps out of the test body under the action of gravity, and a geomechanical model test body with a built-in karst cavity is obtained. 2. method for making karst cave in geomechanics model test as claimed in claim 1, it is characterized in that, in step 1, utilize metallic mold material or non-metallic mold material according to karst cave shape size requirement, design and make ice casting mold; The mold shell is strong and will not be deformed and damaged at low temperatures. 3. method for making karst cave in geomechanics model test as claimed in claim 2, it is characterized in that, the ice body mold described in step 1 comprises upper mold and lower mold, and described upper mold and lower mold link to each other by connector , a sealing ring is provided at the connected position; a liquid injection pipe is provided on the upper mold. 4. method for making karst cave in geomechanics model test as claimed in claim 3, it is characterized in that, the connecting position of described patrix and lower mold is provided with lug plate, and described lug plate is connected by bolt to form mold cavity together. cavity. 5. method for making karst cave in geomechanical model test as claimed in claim 1, is characterized in that, the protection layer described in the described step 3 is to smear vaseline. 6. The method for making karst caves in geomechanical model tests according to claim 1, wherein the freezing equipment includes but is not limited to refrigerators and cold storages. 7. The method for making a karst cave in a geomechanical model test as claimed in claim 1, wherein said liquid can freeze below zero degrees Celsius.