Geotechnical exploration project soft rock ground stress test method

Abstract

The invention relates to a geotechnical exploration project soft rock ground stress test method. The method includes the following steps that: (1) location and depths where test points are required tobe set are determined; (2) boreholes are formed at the locations where the test points are required to be set; (3) stress sensing assemblies are formed outside surrounding rock through casting; (4) the stress sensing assemblies are pushed to the test points; (5) the stress sensing assemblies are fixed; (6) the torsion angles of the stress sensing assemblies are recorded; (7) slurry is injected between three-direction pressure sensor boxes, and the slurry is made to be solidified; (8) the step (4) to step (7) are repeated until the installation of the stress sensing assembly in the corresponding borehole is completed; (9) the step (2) to step (8) are repeated until the installation of the stress sensing assemblies in all the boreholes is completed; and (10) the detection values of the stress sensing assemblies are read, and the ground stress of the test points is determined, and a soft rock region space mechanical model is established.

Description

technical field [0001] The invention relates to the technical field of geotechnical exploration and measurement, and relates to a method for testing soft rock ground stress in geotechnical exploration geotechnical exploration engineering. Background technique [0002] The stability of underground caverns and their surrounding rocks under complex conditions has always been concerned, especially in high ground stress, developed groundwater and relatively broken surrounding rocks, the deformation damage is very serious and lasts for a long time, and at the same time, it shows temporal and spatial inconsistency. Uniformity, asymmetry and many other characteristics make excavation, support and maintenance difficult. [0003] In-situ stress is the fundamental source of surrounding rock pressure in underground engineering. Gravity and tectonic movement are the main causes of in-situ stress, among which the horizontal tectonic movement has the greatest influence on the formation an...

AI Technical Summary

Problems solved by technology

However, due to its technical scheme, the sensing column is cemented with cement mortar outside the borehole, and its self-stress is different from the condition of cementing under the surrounding rock pressure in the borehole, which will affect the measurement results; at the same time, due to the sensor The column is easy to twist during the setting process. The push rod used to move the sensing column needs to be equipped with an angle measuring device. When each sensing column is fixed, the angle measuring device needs to be used to determine the final angle of the sensing column.

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