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Dynamically-disturbed low-temperature rock triaxial loading and unloading rheometer and test method

A dynamic disturbance, loading and unloading technology, applied in the direction of applying stable tension/pressure to test the strength of materials, instruments, scientific instruments, etc., can solve the problems of lack, no data available for rheological characteristics and stability evaluation, etc., to achieve operation Convenience, friendly interface, and high measurement accuracy

Inactive Publication Date: 2017-08-11
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many studies on the triaxial compression and rheological properties of fractured rock mass, but due to the lack of advanced equipment, the research on triaxial compression test and triaxial rheological properties of fractured rock mass under low temperature and disturbance conditions is still blank. The mechanical properties of the triaxial compression and the time-varying mechanical behavior of the low-temperature fractured rock mass after disturbance are still unknown; in addition, the deformation of the low-temperature fractured rock mass over time will exert force on the concrete well wall, making the newly poured concrete The wellbore is subject to dual effects of rock wall deformation and blasting vibration, and there is no data available for the rheological characteristics and stability evaluation under the disturbance effect

Method used

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  • Dynamically-disturbed low-temperature rock triaxial loading and unloading rheometer and test method
  • Dynamically-disturbed low-temperature rock triaxial loading and unloading rheometer and test method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] The steps of applying the above-mentioned triaxial loading and unloading rheometer for dynamic perturbation low temperature rock to carry out the triaxial unloading rheological test of dynamic perturbation rock are as follows:

[0058] Step 1. Determine the test plan; assume that the test temperature is -10°C and the initial confining pressure is σ 3 =12MPa, axial pressure σ 1=60MPa, using the weight dynamic disturbance system (constant impact speed), the disturbance load is from 10kg impact weight 1-21, the free fall distance is 300mm, and the reduction motor 1-11 is adjusted to make the weight impact frequency 10 times / min , the unloading stress path is that the axial pressure is constant, the confining pressure is unloaded step by step, and the unloading level of the confining pressure is 3MPa, such as Figure 12 shown.

[0059] Step 2, sample preparation; take the processed cylindrical rock sample 13 of φ50×100mm, fully saturate it with water, put it in a low-temp...

Embodiment 2

[0066] The steps of applying the above dynamic disturbance low temperature rock triaxial loading and unloading rheometer to carry out rock dynamic disturbance low temperature triaxial loading rheological test are as follows:

[0067] Step 1, determine the test plan; assume that the test temperature is -10°C and the test confining pressure is σ 3 =8MPa, initial axial pressure σ 1 =40MPa, using the impact cylinder dynamic disturbance system (the mass of the impact rod is constant), the dynamic disturbance speed is set to 10m / s by the software, the impact frequency is set to 0.1Hz, the loading stress path is that the confining pressure remains constant, and the axial pressure increases step by step, and Axial pressure step loading level is 5MPa, such as Figure 13 shown.

[0068] Steps 2-5 are the same as steps 2-5 in the first embodiment.

[0069] Step 6, low temperature rock triaxial loading rheological test under the action of dynamic disturbance; start the impact cylinder ...

Embodiment 3

[0072] The steps of applying the above dynamic disturbance low temperature rock triaxial loading and unloading rheometer to carry out rock dynamic disturbance low temperature triaxial compression test are as follows:

[0073] Step 1, determine the test plan; assume that the test temperature is -10°C and the test confining pressure is σ 3 =8MPa, using the weight dynamic disturbance system (constant impact speed), the disturbance load is from 10kg impact weight 1-21, the free fall distance is 300mm, and the reduction motor 1-11 is adjusted to make the weight impact frequency 10 times / min .

[0074] Steps 2-5 are the same as steps 2-5 in the first embodiment.

[0075] Step 6, triaxial compression test of low-temperature rock under dynamic disturbance; start the axial pressure loading system 8 and the confining pressure loading system 9, and adjust the switching valve 8-2 so that the servo valve 8-3 communicates with the loading cylinder 8-1. At this time , the axial loading sys...

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Abstract

The invention relates to a dynamically-disturbed low-temperature rock triaxial loading and unloading rheometer and test method. The rheometer comprises a dynamic disturbance system, a frame, a guide rail, a lifting mechanism, a pressure chamber, a trolley, a temperature control system, an axial loading system, a confining pressure loading system, a measuring system, a control system and a computer and software system, a loading cylinder in the axial loading system can switch between a lead screw booster and a servo valve through a switching valve, a servo oil source, a servo valve and a loading cylinder are communicated through the switching valve when a conventional triaxial compression test is performed, the lead screw booster is communicated with the loading cylinder through the switching valve when a triaxial rheological test is performed, and rock samples are subjected to dynamic disturbance by the aid of a weight dynamic disturbance system or an impacting cylinder disturbance system. The rheometer effectively achieves rock triaxial loading and unloading rheological tests and conventional triaxial compression tests under the conditions of negative temperature and dynamic disturbance and is simple in integral structure principle, variable in function and high in applicability.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of rock mechanics test equipment, and relates to a three-axis loading and unloading rheometer and a test method for dynamic disturbance low-temperature rock. [0003] Background technique: [0004] The Ordos Basin in Northwest my country is rich in coal reserves. The 13th Five-Year Plan clearly states that the eastern region should be restricted, the central and northeast regions should be controlled, the development of coal resources in the western regions should be optimized, and the green mining and transformation of large coal bases should be promoted. It can be seen that the development and utilization of coal resources in the western region is of great significance to the national economic development and energy security strategies. However, the lithology of the rock strata within the mining depth range in this area is quite different. And the groundwater in the water collection corridor of the ...

Claims

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Application Information

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IPC IPC(8): G01N3/18G01N3/303
CPCG01N3/18G01N3/303G01N2203/0033G01N2203/0228
Inventor 单仁亮白瑶隋顺猛孙鹏飞
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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