A test system for local wall stress relief method in deep drilling complex environment

Abstract

The invention belongs to the technical field of geotechnical mechanics measurement, and specifically discloses a local wall stress relief method testing system in a complex environment of a deep borehole. It includes an electronic control acquisition subsystem, a push positioning mechanism, a stress relief and strain measurement subsystem and a hydraulic balance subsystem that are connected in sequence. The electronic control acquisition subsystem is connected to the ground controller through a communication transmission device, and the push positioning mechanism moves along the borehole. The radial expansion of the central axis forms the contact between the fulcrum and the borehole wall. The stress relief and strain measurement subsystem is used to collect and obtain the strain data of the drilling borehole wall during the stress relief process. The hydraulic balance subsystem is used to balance the internal space of the overall system and the drilling Internal pressure. The invention can accurately control and test the local wall surface at a depth of more than 3,000 meters on the ground, realize automatic control and real-time transmission of test data in the complex environment of deep drilling, and is not suitable for drilling a landslide danger, and has the advantages of simple operation and effective Stable and easy to maintain.

Description

technical field [0001] The invention belongs to the technical field of rock and soil mechanics measurement, and more specifically relates to a test system for local wall stress relief in a deep borehole complex environment. Background technique [0002] Unlike man-made materials such as concrete or rebar, natural materials such as rock and soil are subject to natural stresses. The stress of rock can be roughly divided into two categories. The first category is in-situ stress, which can be further subdivided into gravity stress, tectonic stress, residual stress and geodetic stress. The second category is the ground stress disturbance caused by human activities, such as mining, excavation, drilling, water pumping (oil) and so on. In all engineering fields dealing with rocks, it is very important to know the state of stress in the ground. [0003] However, at present, the in-situ stress measurement technology has problems such as insufficient test depth, unstable test results...

AI Technical Summary

Problems solved by technology

However, when testing in the deeper part of the borehole, the isolation and drainage of the hole wall section will lead to the collapse of the hole wall, which will cause the equipment to be buried in the hole, causing inestimable and huge losses

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