CN106198347A - Rock seepage rate Auto-Test System and method of testing - Google Patents

Abstract

An automatic test system for rock water permeability, which is composed of a water tank, a flow meter, a peristaltic pump, a water injection head, a liquid level gauge, a control module, and a rock test piece; based on the foregoing system, the present invention also proposes an automatic test method for rock water permeability The beneficial technical effect of the present invention is: provide an automatic rock water permeability testing system and testing method, the program can realize the automatic testing of rock water permeability at a relatively low cost.

Description

Automatic test system and test method for rock water permeability

technical field

The invention relates to a rock water permeability test technology, in particular to an automatic rock water seepage test system and a test method.

Background technique

As one of the main triggers of disasters such as slope deformation and failure, landslides, and mine collapses, seepage in rock and soil will have a huge impact on the mechanical indicators and physical forms of rock and soil. In engineering practice, in order to ensure the safety of structures and avoid disasters and accidents Strict experiments and evaluations must be carried out on the water seepage state of the engineering structure and the possible impact of water seepage.

In the prior art, most seepage tests are carried out by drilling pressure holes and pressurized water experiments. The existing methods can only test the seepage pressure and seepage performance of the rock mass, and the important parameters such as seepage speed and seepage direction are not yet very economical. Effective testing program.

Contents of the invention

Aiming at the problems in the background technology, an automatic test system for rock water permeability has a structure: the automatic test system for rock water permeability consists of a water tank, a flow meter, a peristaltic pump, a water injection head, a liquid level gauge, a control module and a rock test piece (the rock specimen is made by field sampling); the water outlet of the water tank is connected with the water inlet of the flowmeter, the water outlet of the flowmeter is connected with the water inlet of the peristaltic pump, and the water outlet of the peristaltic pump is connected with the water inlet of the water injection head. The water end is connected, and the water outlet end of the water injection head faces downward; the rock test piece is arranged under the water injection head, and a water storage tank is prefabricated in the middle of the rock test piece, and the water outlet end of the water injection head is opposite to the water storage tank; the detection end of the liquid level gauge It is suspended in the middle of the inner cavity of the water storage tank; the control module is electrically connected with the flowmeter, the peristaltic pump and the liquid level gauge respectively; water is stored in the water tank.

The functions of each device in the aforementioned automatic test system are: the water tank is used to contain test water, the flow meter is used to measure the water flow, and the peristaltic pump is used to pump the water in the water tank to the rock specimen at a relatively constant speed. The liquid level gauge provides a trigger signal for the control module by detecting the liquid level, and the control module is used to control the action of the peristaltic pump, obtain relevant data and perform data processing; the automatic test system can automatically complete the rock water permeability of the rock specimen The test operation, the system structure is simple, and various devices are common products in the engineering field.

Based on the aforementioned rock water permeability automatic testing system, the present invention also proposes a kind of rock water permeability automatic testing method, and the hardware involved is as described above; the concrete steps are:

1) Set up an automatic test system for rock water permeability according to the aforementioned method, and fully dry the liquid level gauge, water injection head and rock specimen;

2) When the water is in contact with the detection end, the liquid level gauge outputs a high-level signal, and when the water level is lower than the detection end, the liquid level gauge outputs a low-level signal;

After starting the test, the control module controls the peristaltic pump to start. After a certain period of time, the liquid level gauge outputs a high-level signal to the control module. After receiving the high-level signal, the control module controls the peristaltic pump to stop working, and records the current time t ₀ , after that, cycle operation starts: when receiving a low-level signal, the control module controls the peristaltic pump to start, and records the corresponding time data; when receiving a high-level signal, the control module controls the peristaltic pump to stop working, and records Corresponding time data;

During the cyclic operation, the data obtained at multiple times are sequentially recorded as _{t 1} , _{t 2} , t ₃ . Odd numbers starting with 1;

3) During the cyclic operation, every time the data acquisition operation of a measurement cycle is completed, the control module calculates the permeability corresponding to the current measurement cycle in real time according to the following formula:

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; V</span>}}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, v _k is the permeability corresponding to the kth measurement cycle, k is a natural number starting from 1; V is the rated flow rate of the peristaltic pump, and the unit of V is: ml/s;

4) When the number of measurement cycles reaches the set number, or when the time length of the cycle operation reaches the set value, the cycle operation ends; if the number of measurement cycles is N, then the permeability corresponding to the last measurement cycle is v _N ; After the cycle operation is over, the control module calculates the average permeability of the rock specimen according to the following formula

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}^{<span\; class="notranslate">\; ~</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}$

in, is the correction value of v _N ; calculated according to the following formula

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}^{<span\; class="notranslate">\; ~</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; V</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; V</span>}}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, ΔV is the volume of water remaining in the pipeline and device between the flowmeter and the water injection head after the cycle operation is completed; the specific value of ΔV is calculated according to the following formula:

ΔV＝V _F -V·[(t ₂ +t ₄ +...+t _2N )-(t ₁ +t ₃ +...+t _2N-1 )]

Wherein, V _F is the total volume of water flowing through the flow meter measured by the flow meter during the period of t ₁ -t _2N .

The principle that the data processing part of the present invention is based on is relatively simple, promptly calculates the average permeability of rock specimen according to the permeability of multiple measurement cycles; There will inevitably be a certain volume of water remaining in the pipelines and devices between them, and this part of residual water will affect the accuracy of the calculated average permeability. In order to eliminate this part of the influence, the present invention uses the average permeability calculation formula introduced in This correction value, by Eliminate the influence of residual water on the calculation results.

After the aforementioned automatic test system for rock water permeability is combined with the automatic test method for rock water permeability, the automatic test of rock water permeability can be realized at a relatively low cost.

The beneficial technical effect of the present invention is that it provides an automatic testing system and testing method for rock water permeability, which can realize automatic testing of rock water permeability at a relatively low cost.

Description of drawings

Fig. 1, structural representation of the present invention;

The names corresponding to each mark in the figure are: water tank 1, flow meter 2, peristaltic pump 3, water injection head 4, liquid level gauge 5, control module 6, and rock specimen 7.

detailed description

An automatic test system for rock water permeability, the innovation of which is: the automatic test system for rock water permeability consists of a water tank 1, a flow meter 2, a peristaltic pump 3, a water injection head 4, a liquid level gauge 5, a control module 6 and a rock test piece 7 Composition; the water outlet of the water tank 1 is connected to the water inlet of the flow meter 2, the water outlet of the flow meter 2 is connected to the water inlet of the peristaltic pump 3, and the water outlet of the peristaltic pump 3 is connected to the water inlet of the water injection head 4 , the water outlet end of the water injection head 4 faces downward; the rock test piece 7 is arranged below the water injection head 4, and a water storage tank is prefabricated in the middle of the rock test piece 7, and the water outlet end of the water injection head 4 is opposite to the water storage tank; the liquid level gauge 5 The detection end is suspended in the middle of the inner cavity of the water storage tank; the control module 6 is electrically connected to the flowmeter 2, the peristaltic pump 3 and the liquid level gauge 5 respectively; water is stored in the water tank 1.

A rock water permeability automatic test method, the hardware involved includes an automatic rock water permeability test system: the rock water permeability automatic test system consists of a water tank 1, a flow meter 2, a peristaltic pump 3, a water injection head 4, a liquid level gauge 5, The control module 6 and the rock test piece 7 are composed; the water outlet of the water tank 1 is connected to the water inlet of the flow meter 2, the water outlet of the flow meter 2 is connected to the water inlet of the peristaltic pump 3, and the water outlet of the peristaltic pump 3 is connected to the water inlet of the peristaltic pump 3. The water inlet end of the water injection head 4 is connected, and the water outlet end of the water injection head 4 is downward; the rock test piece 7 is arranged below the water injection head 4, and a water storage tank is prefabricated in the middle of the rock test piece 7, and the water outlet end of the water injection head 4 is connected to the water storage tank. Relatively; the detection end of the liquid level gauge 5 is suspended in the middle of the inner cavity of the water storage tank; the control module 6 is electrically connected with the flow meter 2, the peristaltic pump 3 and the liquid level gauge 5 respectively; water;

Its innovation is: described method comprises:

1) Set up an automatic test system for rock water permeability according to the aforementioned method, and fully dry the liquid level gauge 5, water injection head 4 and rock test piece 7;

2) When the water is in contact with the detection end, the liquid level gauge 5 outputs a high-level signal, and when the water level is lower than the detection end, the liquid level gauge 5 outputs a low-level signal;

After starting the test, the control module 6 controls the peristaltic pump 3 to start. After a certain period of time, the liquid level gauge 5 outputs a high-level signal to the control module 6. After receiving the high-level signal, the control module 6 controls the peristaltic pump 3 to stop working. And record the current time t ₀ , and then start the cycle operation: when receiving a low-level signal, the control module 6 controls the peristaltic pump 3 to start, and records the corresponding time data; when receiving a high-level signal, the control module 6 Control the peristaltic pump 3 to stop working, and record the corresponding time data;

During the cyclic operation, the data obtained at multiple times are sequentially recorded as _{t 1} , _{t 2} , t ₃ . Odd numbers starting with 1;

3) During the cyclic operation, every time the data acquisition operation of a measurement cycle is completed, the control module 6 calculates the permeability corresponding to the current measurement cycle in real time according to the following formula:

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; V</span>}}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, v _k is the permeability corresponding to the kth measurement cycle, k is a natural number starting from 1; V is the rated flow rate of the peristaltic pump 3, and the unit of V is: ml/s;

4) When the number of measurement cycles reaches the set number, or when the time length of the cycle operation reaches the set value, the cycle operation ends; if the number of measurement cycles is N, then the permeability corresponding to the last measurement cycle is v _N ; After the cycle operation finishes, the control module 6 calculates the average permeability of the rock test piece 7 according to the following formula

$\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; v</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span><span\; class="notranslate">\; ...</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}^{<span\; class="notranslate">\; ~</span>}}{\mathrm{<span\; class="notranslate">\; N</span>}}$

in, is the correction value of v _N ; calculated according to the following formula

${\mathrm{<span\; class="notranslate">\; v</span>}}_{\mathrm{<span\; class="notranslate">\; N</span>}}^{<span\; class="notranslate">\; ~</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; V</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; V</span>}}{{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; N</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; t</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}}}$

Among them, ΔV is the volume of water remaining in the pipeline and device between the flowmeter 2 and the water injection head 4 after the cycle operation is completed; the specific value of ΔV is calculated according to the following formula:

ΔV＝V _F -V·[(t ₂ +t ₄ +...+t _2N )-(t ₁ +t ₃ +...+t _2N-1 )]

Wherein, V _F is the total volume of water flowing through the flow meter 2 measured by the flow meter 2 within the time period of t ₁ -t _2N .

Claims (2)

1. The utility model provides a rock water permeability automatic test system which characterized in that: the automatic rock water permeability testing system consists of a water tank (1), a flowmeter (2), a peristaltic pump (3), a water injection head (4), a liquid level meter (5), a control module (6) and a rock test piece (7); the water outlet end of the water tank (1) is connected with the water inlet end of the flow meter (2), the water outlet end of the flow meter (2) is connected with the water inlet end of the peristaltic pump (3), the water outlet end of the peristaltic pump (3) is connected with the water inlet end of the water injection head (4), and the water outlet end of the water injection head (4) faces downwards; the rock test piece (7) is arranged below the water injection head (4), a water storage tank is prefabricated in the middle of the rock test piece (7), and the water outlet end of the water injection head (4) is opposite to the water storage tank; the detection end of the liquid level meter (5) is suspended in the middle of the inner cavity of the water storage tank; the control module (6) is respectively and electrically connected with the flowmeter (2), the peristaltic pump (3) and the liquid level meter (5); the water tank (1) is internally stored with water.

2. A rock water permeability automatic test method relates to hardware comprising a rock water permeability automatic test system: the automatic rock water permeability testing system consists of a water tank (1), a flowmeter (2), a peristaltic pump (3), a water injection head (4), a liquid level meter (5), a control module (6) and a rock test piece (7); the water outlet end of the water tank (1) is connected with the water inlet end of the flow meter (2), the water outlet end of the flow meter (2) is connected with the water inlet end of the peristaltic pump (3), the water outlet end of the peristaltic pump (3) is connected with the water inlet end of the water injection head (4), and the water outlet end of the water injection head (4) faces downwards; the rock test piece (7) is arranged below the water injection head (4), a water storage tank is prefabricated in the middle of the rock test piece (7), and the water outlet end of the water injection head (4) is opposite to the water storage tank; the detection end of the liquid level meter (5) is suspended in the middle of the inner cavity of the water storage tank; the control module (6) is respectively and electrically connected with the flowmeter (2), the peristaltic pump (3) and the liquid level meter (5); water is stored in the water tank (1);

the method is characterized in that: the method comprises the following steps:

1) an automatic rock water permeability testing system is built according to the method, and the liquid level meter (5), the water injection head (4) and the rock test piece (7) are fully dried;

2) when water is contacted with the detection end, the liquid level meter (5) outputs a high level signal, and when the water level is lower than the detection end, the liquid level meter (5) outputs a low level signal;

after the test is started, the control module (6) controls the peristaltic pump (3) to start, after a certain time, the liquid level meter (5) outputs a high level signal to the control module (6), after receiving the high level signal, the control module (6) controls the peristaltic pump (3) to stop working, and records the current time t₀After that, a cyclic operation is started: when receiving a low level signal, the control module (6) controls the peristaltic pump (3) to start and records corresponding time data, and when receiving a high level signal, the control module (6) controls the peristaltic pump (3) to stop working and records corresponding time data;

in the cyclic operation process, a plurality of acquired time data are sequentially recorded as t according to the time sequence₁、t₂、t₃……；t_n-1～t_n+1The corresponding time interval is recorded as a measuring period, and n is an odd number from 1;

3) in the cyclic operation process, each time the data acquisition operation of one measurement period is finished, the control module (6) calculates the permeability corresponding to the current measurement period in real time according to the following formula:

$v_k=\frac{(t_{2k}-t_{2k-1})\&CenterDot;V}{t_{2k}-t_{2k-2}}$

wherein v is_kIs the permeability corresponding to the kth measurement period, k being a natural number starting from 1; v is the rated flow rate of the peristaltic pump (3), and the unit of V is: ml/sec;

4) when the number of the measuring periods reaches the set number or the time length of the circulating operation reaches the set value, the circulating operation is finished; if the number of the measurement periods is N, the permeability corresponding to the last measurement period is v_N(ii) a After the circulation operation is finished, the control module (6) calculates the average permeability of the rock test piece (7) according to the following formula

$\stackrel{\&OverBar;}{v}=\frac{v_1+v_2+\mathrm{...}+v_{N-1}+v_N^{~}}{N}$

Wherein,is v is_NThe correction value of (1); calculated according to the following formula

$v_N^{~}=\frac{(t_{2N}-t_{2N-1})\&CenterDot;V-\mathrm{\&Delta;}V}{t_{2N}-t_{2N-2}}$

Wherein, DeltaV is the volume of water remained in a pipeline and a device between the flowmeter (2) and the water injection head (4) after the circulation operation is finished; the specific value of Δ V is calculated according to the following formula:

ΔV＝V_F-V·[(t₂+t₄+...+t_2N)-(t₁+t₃+...+t_2N-1)]

wherein, then V_FIs t₁～t_2NThe total volume of water flowing through the flow meter (2) measured by the flow meter (2) over the period of time.