CN218674983U - Dry-wet circulation system for rock expansion test - Google Patents

Abstract

This application proposes a dry-wet circulation system for rock expansion test, including temperature control-deformation monitoring system, temperature sensor, displacement sensor, heating resistance wire, permeable stone, sample, centering base plate, pad, water outlet , water injection port and test chamber. The temperature sensor, displacement sensor and heating resistance wire are uniformly regulated by the temperature control-deformation monitoring module on the detachable top cover of the test box to obtain the expansion and deformation of the sample under the dry-wet cycle condition. The system integrates water immersion and drying conditions, which can monitor and accurately measure the deformation of the sample during water immersion and drying, and can provide more accurate results and convenient operation for rock expansion tests.

Description

A dry-wet circulation system for rock expansion test

technical field

The present application relates to the field of civil engineering rock expansivity test, in particular to a dry-wet cycle system for rock expansibility test.

Background technique

Rocks that expand and disintegrate when exposed to water are commonly referred to as expansive rocks. Because it contains expansive clay minerals, a series of physical and chemical reactions will occur under the action of water, resulting in changes in its internal microstructure, thereby affecting the mechanical strength properties of rocks. This phenomenon is manifested under dry-wet cycle conditions. more obvious. In actual engineering, the swelling and disintegration of rocks in contact with water will bring huge potential hazards to the project and seriously affect the safety of the project. Therefore, it is very important to measure the expansibility of rock, which is mainly realized by expansion rate test and expansion force test.

During the expansion rate test, the axial and radial deformation of the sample is mainly monitored by the dial gauge. When simulating the dry-wet cycle conditions, the sample is first soaked in water to monitor its deformation, and then the dilatometer needs to be moved to the oven. During the drying process, the sample is dried, and the deformation of the sample is monitored at the same time. During the moving process, the dial indicator is prone to reading changes due to disturbances that affect the test results, and the more the number of dry-wet cycles, the greater the impact on the test results. At the same time, it is necessary to monitor the deformation of the sample during the drying process, but it is very inconvenient to read the dial indicator in the oven, and the reading accuracy of the existing dial indicator will be affected to a certain extent under the conditions of water and high temperature. Influence.

Therefore, there is an urgent need to develop a dry-wet cycle system for rock expansion tests under the conditions of water immersion and drying to solve the problems of cumbersome test steps and inconvenient operation during the dry-wet cycle of the expansion test. Real-time monitoring and precise measurement of deformation can provide more accurate results and convenient operation for rock expansion tests.

Utility model content

The purpose of this application is to overcome the deficiencies of the prior art and provide a dry-wet circulation system for rock expansion tests. The system integrates water immersion and drying conditions, and can monitor the deformation of the sample in real time during water immersion and drying. And accurate measurement, can provide more accurate results and convenient operation for rock expansion test.

In order to achieve the above-mentioned purpose, the technical scheme that this application adopts is:

A dry-wet cycle system for rock expansion test, including temperature control-deformation monitoring module, temperature sensor, axial displacement sensor, radial displacement sensor, heating resistance wire, permeable stone, sample, centering base plate, pad block, water outlet, water injection port and test chamber. The test box includes a test box body and a detachable top cover; the inside of the test box body is equipped with heating resistance wires around and at the bottom, and radial displacement sensors are arranged in the center of the outside of the test box body and through the inside; The water outlet and the water injection port are respectively arranged on both sides of the test box near the bottom; the detachable top cover of the test box is provided with a temperature control-deformation monitoring module, and two temperature sensors are provided on both sides of the central axis of the detachable top cover , an axial displacement sensor is connected directly under the detachable top cover; a permeable stone is placed at the bottom of the sample, a centering base plate is placed at the top, pads are bonded around the sample, so that the pointer contact surface of the radial displacement sensor smooth. The temperature sensor, displacement sensor and heating resistance wire are uniformly regulated by the temperature control-deformation monitoring module on the detachable top cover of the test box to obtain the expansion and deformation of the sample under the dry-wet cycle condition.

Preferably, the size of the test box is 140mm×140mm×110mm (length×width×height), and a layer of heating resistance wires is respectively arranged on the inside of the test box and within 10mm of the bottom.

Preferably, the outer panel and the detachable top cover of the test box are made of thermal insulation material, and the inner panel is made of water-proof and heat-conducting material.

Preferably, the radial displacement sensor is installed at the center around the test box, and four are installed in total. The pointer of the radial displacement sensor is against the pads around the sample, and the contact position of the pointer is adjusted through the elastic screw at the rear end. The measured data is transmitted to the temperature control-deformation monitoring module through the wireless module.

Preferably, the axial displacement sensor is installed at the center of the lower end of the detachable top cover of the test chamber, and has an integral structure with the temperature control-deformation monitoring module at the upper end, and the pointer of the axial displacement sensor touches the concave point on the centering base plate .

Preferably, the sample is a cylinder with a diameter of 50 mm and a height of 50 mm, which is placed in the center of the test chamber, a permeable stone is placed at the bottom of the sample, and a centering base plate is placed on the top of the sample to ensure that the position of the sample does not occur. offset.

Preferably, the temperature control-deformation monitoring module integrates temperature control and deformation monitoring functions, and its panel displays the drying temperature of the test chamber, axial monitoring displacement and radial monitoring displacement.

Preferably, the temperature sensor is arranged on the detachable top cover of the test box, and the temperature measuring end extends into the test box, and the measured data is transmitted to the temperature control-deformation monitoring module through a cable.

A kind of dry-wet circulation system used for rock expansion test provided by the application steps includes:

First open the removable top cover of the test box, adjust the telescopic distance of the radial displacement sensor around the test box, place the permeable stone at the center of the bottom of the test box, then place the prefabricated sample on the permeable stone, and adjust the test box again The expansion and contraction distance of the radial displacement sensor around, and at the same time bond the cushion block at the position where the sample contacts the pointer of the radial displacement sensor to ensure that the pointer contact surface of the radial displacement sensor is level. Then place the centering base plate on the top of the sample, cover the detachable top cover of the test box, adjust the telescopic distance of the axial displacement sensor through the button on the temperature control-deformation monitoring module, and ensure that its pointer just touches the centering base plate the concave point. Clear the reading of the displacement sensor on the temperature control-deformation monitoring module, then close the water outlet, turn on the water injection port switch, and use an external water pipe to fill the box with water until the sample is submerged. After immersing the sample for a specified time, the radial deformation and axial deformation are displayed through the temperature control-deformation monitoring module. After the immersion is completed, the water outlet switch is turned on to discharge the water in the test chamber. Then turn on the heating switch of the test box, and dry the sample by heating the resistance wire to the specified temperature. At the same time, the temperature sensor is used to monitor the temperature in the test box in real time, and the temperature control-deformation monitoring module is automatically adjusted to maintain a constant temperature inside the box. . Finally, the change data of the radial and axial deformation of the sample with time is obtained on the display screen of the temperature control-deformation monitoring module.

Compared with the prior art, the present application has the following beneficial effects:

This application combines the water immersion and drying conditions of the rock expansion test under the condition of dry-wet cycle, which solves the problems of cumbersome test steps and inconvenient operation in the process of dry-wet cycle of the expansion test, and can be used for different times of dry-wet cycles. Real-time monitoring and accurate measurement of sample deformation can reduce the interference of human factors on test results, and provide more accurate results and convenient operation for rock expansion tests.

Description of drawings

In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are the For some embodiments of the present invention, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts.

Fig. 1 is the three-dimensional structure schematic diagram of the present application;

Fig. 2 is the front view of the present application;

Fig. 3 is the side view of the present application;

Fig. 4 is the top view of the present application;

Fig. 5 is a three-dimensional schematic diagram of the connection of internal components of the present application;

Figure 6 is a detailed view of the axial displacement sensor;

Figure 7 is a detailed view of the radial displacement sensor.

In the figure: 1. Temperature control-deformation monitoring module; 2-1. Temperature sensor one; 2-2. Temperature sensor two; 3. Detachable top cover; 4. Heating resistance wire; 5. Centering base plate; 6- 1. Radial displacement sensor 1; 6-2. Radial displacement sensor 2; 6-3. Radial displacement sensor 3; 6-4. Radial displacement sensor 4; 7. Water outlet; 8. Water injection port; 9. Permeable stone; 10, sample; 11-1, block one; 11-2, block two; 11-3, block three; 11-4, block four; 12, axial displacement sensor; 13, test box.

Detailed ways

In order to make the purpose, technical solutions and advantages of the application clearer, the application will be further described in detail below in conjunction with the examples and accompanying drawings. The schematic implementation of the application and its description are only used to explain the application and are not intended to As a limitation of this application.

As shown in Fig. 1-Fig. 4 is a dry-wet cycle system for rock expansion test of the present application, including temperature control-deformation monitoring module 1, heating resistance wire 4, centering base plate 5, water outlet 7, injection Nozzle 8, permeable stone 9, sample 10, axial displacement sensor 12, temperature sensor, radial displacement sensor, pad and test box. Described temperature sensor comprises temperature sensor one 2-1 and temperature sensor two 2-2; Described radial displacement sensor comprises radial displacement sensor one 6-1, radial displacement sensor two 6-2, radial displacement sensor Three 6-3 and four radial displacement sensors 6-4; the pads include pad one 11-1, pad two 11-2, pad three 11-3 and pad four 11-4; The test box includes a test box body 13 and a detachable top cover 3; the water outlet 7 and the water injection port 8 are respectively arranged on both sides of the test box near the bottom; the inside of the test box is equipped with heating resistance wires around and at the bottom. 4. The test box 13 is equipped with a radial displacement sensor through the center of the outer periphery and the inside; the detachable top cover 3 of the test box is provided with a temperature control-deformation monitoring module 1 on both sides of the central axis of the detachable top cover 3 A temperature sensor 2-1 and a temperature sensor 2 2-2 are provided, and an axial displacement sensor 12 is connected directly under the detachable top cover; the permeable stone 9 is placed on the bottom of the sample 10, and a centering base is placed on the top. Adhesive pads are bonded around disk 5 and sample 10 to make the contact surface of the pointer of the radial displacement sensor smooth.

The size of the test box is 140mm×140mm×110mm (length×width×height), and a layer of heating resistance wires 4 are respectively arranged on the inside of the test box and within 10mm of the bottom.

The outer panel of the test box 13 and the detachable top cover 3 are made of thermal insulation materials, and the inner panel is made of water-proof and heat-conducting materials.

The radial displacement sensor is installed in the center position around the test box 13, which are radial displacement sensor one 6-1, radial displacement sensor two 6-2, radial displacement sensor three 6-3 and radial displacement sensor 4. 6-4. The pointer of the radial displacement sensor is pressed against the pads around the sample 10, and the contact position of the pointer is adjusted through the elastic screw at the rear end, and the measured data is transmitted to the temperature control-deformation monitoring module 1 through the wireless module.

The axial displacement sensor 12 is installed at the center position of the lower end of the detachable top cover 3 of the test chamber, and has an integral structure with the temperature control-deformation monitoring module 1 at the upper end. point.

The sample 10 is a cylinder with a diameter of 50mm and a height of 50mm, which is placed in the center of the test chamber. A permeable stone 9 is placed on the bottom of the sample 10, and a centering base plate 5 is placed on the top of the sample 10.

The temperature control-deformation monitoring module 1 integrates temperature control and deformation monitoring functions, and its panel displays the drying temperature of the test chamber, axial monitoring displacement and radial monitoring displacement.

The temperature sensor is set on the detachable top cover 3 of the test box, and the temperature measuring end extends into the test box, and the measured data is transmitted to the temperature control-deformation monitoring by cable.

The application provides a method for using a dry-wet circulation system for a rock expansion test including:

First open the removable top cover 3 of the test box, adjust the telescopic distance of the radial displacement sensor installed around the test box, place the permeable stone 9 at the center of the bottom of the test box, and then place the prefabricated sample 10 on the permeable stone 9 First, adjust the expansion and contraction distance of the radial displacement sensor around the test box again, and at the same time, bond pads at the position where the sample 10 contacts the pointer of the radial displacement sensor to ensure that the pointer contact surface of the radial displacement sensor is level. Then place the centering base plate 5 on the top of the sample 10, cover the detachable top cover 3 of the test box, adjust the telescopic distance of the axial displacement sensor 12 through the button on the temperature control-deformation monitoring module 1, and ensure that its pointer just touches At the concave point of the centering base plate 5. Clear the reading of the displacement sensor on the temperature control-deformation monitoring module 1, then close the water outlet 7, open the switch of the water injection port 8, and inject water into the box until the sample 10 is submerged with an external water pipe. After immersing the sample 10 for a specified time, the temperature control-deformation monitoring module 1 displays the radial deformation and axial deformation. After the water immersion is completed, the switch of the water outlet 7 is turned on to discharge the water in the test chamber. Then turn on the heating switch of the test box, and dry the sample 10 by heating the resistance wire 4 to the specified temperature, and simultaneously use the temperature sensor one 2-1 and the temperature sensor two 2-2 to monitor the temperature in the test box in real time, and pass The temperature control-deformation monitoring module 1 automatically regulates and maintains a constant temperature state in the test chamber. Finally, on the display screen of the temperature control-deformation monitoring module 1, the change data of the radial and axial deformation of the sample with time are obtained. The above is the test procedure of one dry-wet cycle. If multiple dry-wet cycles are performed, the above-mentioned immersion and drying of the sample can be repeated.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present utility model in detail. Within the protection scope of the utility model, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims (7)

1. A dry-wet circulation system for rock expansion test, characterized in that it comprises a temperature control-deformation monitoring module (1), a heating resistance wire (4), a centering base plate (5), and a water outlet (7) , water injection port (8), permeable stone (9), sample (10), axial displacement sensor (12), temperature sensor, radial displacement sensor, pad and test box; The test box includes a test box body (13) and a detachable top cover (3); the inside of the test box is equipped with heating resistance wires (4) around and at the bottom, and the center of the test box (13) outside is connected to the inside. A radial displacement sensor is arranged through it; the detachable top cover (3) of the test box is provided with a temperature control-deformation monitoring module (1), and a temperature sensor is provided on both sides of the central axis of the detachable top cover (3). (2-1) and temperature sensor two (2-2), the axial displacement sensor (12) is connected directly under the detachable top cover; the permeable stone (9) is placed at the bottom of the sample (10), and the top A centering base plate (5) is placed, and cushion blocks are bonded around the sample (10). 2. A dry-wet circulation system for rock expansion test according to claim 1, characterized in that, the size of the test box length × width × height is 140mm × 140mm × 110mm, and the surrounding area of the test box and A layer of heating resistance wires (4) are respectively provided within the range of 10 mm from the bottom. 3. A kind of dry-wet circulation system that is used for rock expansion test according to claim 1, is characterized in that, described test case body (13) outer panel and detachable top cover (3) adopt thermal insulation material , The inner panel is made of water-proof and heat-conducting material. 4. A kind of dry-wet circulation system that is used for rock expansion test according to claim 1, is characterized in that, described radial displacement sensor is installed in the center position around test case body (13), respectively radial displacement Sensor one (6-1), radial displacement sensor two (6-2), radial displacement sensor three (6-3) and radial displacement sensor four (6-4), the pointer of the radial displacement sensor is on the sample (10) On the surrounding pads, adjust the contact position of the pointer through the elastic screw at the rear end, and the measured data is transmitted to the temperature control-deformation monitoring module (1) through the wireless module. 5. A dry-wet circulation system for rock expansion test according to claim 1, characterized in that, said axial displacement sensor (12) is installed at the center of the lower end of the detachable top cover (3) of the test chamber , and the upper-end temperature control-deformation monitoring module (1) is an integral structure, and the pointer of the axial displacement sensor (12) touches the concave point on the centering base plate (5). 6. A kind of dry-wet cycle system for rock expansion test according to claim 1, characterized in that, said sample (10) is a cylinder with a diameter of 50 mm and a height of 50 mm, which is placed inside the test chamber At the center position, a permeable stone (9) is placed on the bottom of the sample (10), and a centering base plate (5) is placed on the top of the sample (10). 7. A kind of dry-wet circulation system that is used for rock expansion test according to claim 1, is characterized in that, described temperature control-deformation monitoring module (1) integrates temperature control and deformation monitoring function, and displays on its panel Test chamber drying temperature, axial monitoring displacement and radial monitoring displacement.

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