Recyclable ground stress testing device

Abstract

A recyclable ground stress testing device comprises a pipe body, a probe and a movable plate. A notch is formed in the top of the left end of the pipe body, a first guide plate is fixed at the bottom of the pipe body, the two ends of the first guide plate both extend out of the pipe body, a limit plate is fixed at the left end of the first guide plate, a connection rod is hinged to the limit plate, and the movable plate is hinged to the other end of the connection rod. The inner wall of the movable plate gradually becomes thinner from the hinge end to the free end, the movable plate is located at the notch, a pipe body conveying and recycling device is fixed at the right end of the first guide plate, the probe is provided with a stress sensing column, a probe conveying device and a probe recycling device, and the probe can be conveyed into the pipe body along the first guide plate. The recyclable ground stress testing device can be repeatedly used, and lower the cost of stress testing.

Description

technical field [0001] The invention relates to a stress test device, in particular to an in-situ stress test device for coal bodies and rock bodies. Background technique [0002] In-situ stress refers to the stress on underground coal and rock formations, mainly including the self-gravity stress caused by the self-weight of the overlying strata and the structural stress caused by the geological structure. With the progress of coal mining activities, the original stress balance is destroyed, resulting in the redistribution of stress in the mining space. Therefore, the stress of coal and rock mass around the mining space also includes the mining stress. In-situ stress is the basic parameter for coal mine mining, support and roof control, coal and gas outburst and other disaster prevention. Testing and evaluating coal and rock mass stress is the main content of mine pressure observation, and it is the solution to the roadway mine pressure affected by mining. The basis for dec...

AI Technical Summary

Problems solved by technology

The existing ground stress testing device can only be used once because it is not recyclable, resulting in high cost of ground stress testing, and the existing ground stress testing device, such as the device for measuring ground stress with expansion glue, is prone to accidents during the test process. The glue hardens, causing the test device and the surrounding rock mass to be independent of each other, without stress transfer points, causing the test to fail

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