Method for estimating ground stress of soft rock in fault fracture zone
A technology of in-situ stress and fracture zone, applied in calculation, earthwork drilling, data processing and application, etc., can solve the problem that the in-situ stress test results cannot reflect the real in-situ stress status of soft rock in the fault fracture zone
Active Publication Date: 2020-10-20
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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[0004] This application provides a method for estimating the in-situ stress of soft rock in the fault fracture zone, which solves the problem that the in-situ stress tests of existing deep-buried long tunnels are mostly carried out in intact rock mass, and the in-situ stress test results are difficult to reflect the reality of the soft rock in the fault fracture zone. In-situ stress conditions, resulting in a large difference between the large deformation prediction results and the actual measurement results, realized the technical effect of estimating the in-situ stress of soft rock in the fault fracture zone based on the in-situ stress test results of the complete rock mass
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[0045] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.
[0046] See attached figure 1 , a method for estimating in-situ stress of soft rock in a fault fracture zone provided by this application, including:
[0047] S1: Obtain the in-situ stress test results of the three principal stresses in the hard rock area. The three principal stresses include: the horizontal major principal stress, the horizontal minor princi...
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The invention relates to a method for estimating a ground stress of soft rock in a fault fracture zone. The method comprises the following steps of obtaining ground stress test results of three principal stresses in a hard rock area to determine a stress matrix of an original coordinate system of the hard rock area; converting the stress matrix of the original coordinate system of the hard rock area into a stress matrix of a geodetic coordinate system in the hard rock area; converting the stress matrix of the geodetic coordinate system in the hard rock area into a stress matrix of a fault coordinate system in the hard rock area; converting the stress matrix of the fault coordinate system in the hard rock area into a stress matrix of a fault coordinate system in a soft rock area; convertingthe stress matrix of the fault coordinate system in the soft rock area into a stress matrix of a geodetic coordinate system in the soft rock area; and converting the stress matrix of the geodetic coordinate system in the soft rock area into a stress matrix of a tunnel coordinate system in the soft rock area. The method for estimating the stress is based on the ground stress test results of the intact rock mass to estimate the ground stress of the soft rock in the fault fracture zone, so that the large deformation prediction results can be well in line with the actual measurement results.
Description
technical field [0001] The invention relates to the technical field of civil engineering, in particular to a method for estimating the ground stress of soft rock in a fault fracture zone. Background technique [0002] The soft rock in the fault fracture zone of deep-buried long tunnels is prone to large deformation disasters. In-situ stress is an important parameter for the classification and prediction of large deformation disasters, and its reasonable value is very important. At present, the commonly used in-situ stress testing methods include hydraulic fracturing and stress relief methods. The in-situ stress tests of the above two methods require relatively intact rocks, especially the stress relief method also requires drilling and coring for the integrity of the rock mass. higher. [0003] Therefore, most of the existing in-situ stress tests are carried out in the complete rock mass, and the in-situ stress test results are difficult to reflect the real in-situ stress c...
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IPC IPC(8): E21B47/06E21B49/00G06Q50/02
CPCE21B47/06E21B49/00G06Q50/02
Inventor 陈卫忠李喆田洪铭张广泽王栋杨建平田云
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI