Wellhole multi-parameter searching method for rock deformation and damage features

Abstract

The invention discloses a wellhole multi-parameter searching method for rock deformation and damage features. By a BOTDR distributed optical fiber single-end testing mode, total hole depth is deeply drilled to acquire strain data, and different depth positions of an overlying strata after mining of a working face and deformation features of extrusion, tension, shearing and the like, which are shown by a geologic body, of different rock strata in a deformation process can be reflected. Effective deformation of a linear test total drill hole controlled depth stratum is formed, and the shortcoming that data are missing easily by original point type data acquisition is overcome. The test method is clear and visible in test, and has high accuracy and precision; and the heights of a caving zone and a water conducted zone can be judged accurately. By electric field response analysis of a parallel electrical-method test technology, qualitative and quantitative accurate judgment can be realized, test accuracy is improved effectively, and other interference factors are controlled.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering monitoring, in particular to a wellbore multi-parameter exploration method for deformation and failure characteristics of rock formations. Background technique [0002] Ground deep drilling is an important means of obtaining geological data in geological exploration. It can obtain the basic characteristics of different rock layers in the geological body from the ground to the detection target depth through drilling. At present, the testing of the change of the overlying strata is mainly carried out by methods such as abscission indicator, borehole panoramic camera, borehole high-density electrical method, etc., but none of the above methods can achieve real-time linearity test, and the field data The amount is small, easily affected by the test environment and conditions, and it is difficult to do quantitative analysis. In particular, it is very difficult to test the spatial rang...

AI Technical Summary

Problems solved by technology

At present, the testing of the change of the overlying strata is mainly carried out by methods such as abscission indicator, borehole panoramic camera, borehole high-density electrical method, etc., but none of the above methods can achieve real-time linearity test, and the field data The amount is small, easily affected by the test environment and conditions, and it is difficult to do quantitative analysis

In particular, it is difficult to test the spatial range of deep drill bodies, and the result profile has corresponding limitations in the ability to distinguish formation deformation and failure

At present, the corresponding conventional electrical method or seismic observation system arranged in the borehole can also obtain the abnormal deformation characteristics of the borehole body in space, but it cannot realize the subsidence, extrusion, stretching and other deformations of the formation during the mining process of the working face. Effective and comprehensive understanding, the data acquisition process is complex and expensive, and the key data of deformation characteristics are easily lost in point-type and quasi-distributed data acquisition, and the reliability of the results is not enough

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