In-situ test method for surrounding rock relaxation depth in columnar jointing rock mass cavity project

A technology of columnar joints and relaxation depth, applied in drilling equipment and methods, measuring devices, earthwork drilling and mining, etc., can solve the problems of sound wave velocity difference, inhomogeneity, and difficulty in completeness of sound wave velocity, and achieve accurate determination of relaxation depth , Simple technical solution, reliable test method
CN103487797AInactive Publication Date: 2014-01-01INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
Publication Date
2014-01-01
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to an in-situ test method for the surrounding rock relaxation depth in a columnar jointing rock mass cavity project. The in-situ test method includes the steps of designing and arranging test drilling holes which are formed in the periphery of a cavity excavated in a columnar jointing rock mass and parallel or perpendicular to the axis of a column body of the columnar jointing rock mass, selecting test projects, determining the relaxation depth, and comprehensively conducting the test. The test drilling holes are distributed in key portions of a monitored fracture surface after the cavity is excavated, surrounding rock elastic waves and jointing fissure characteristics of the monitored fracture surface of the excavated cavity are obtained through an in-situ test means which integrates digital drilling with camera shooting and integrates single hole sound waves with across hole sound waves, and the surrounding rock relaxation depth is comprehensively judged according to reduction of the wave velocity of the sound waves in an unloading relaxation area and the corresponding rock mass fracture condition. The technical scheme is simple, the test means is reliable, comprehensive collection and comparison analysis of columnar jointing rock mass unloading relaxation information are ensured, the surrounding rock relaxation depth is accurately confirmed, the in-situ test method can be widely applied to columnar jointing rock mass excavation and supporting projects such as water conservancy and hydropower projects, traffic projects and underground test site projects.
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Description

technical field

[0001] The invention relates to an in-situ test method for the relaxation depth of the surrounding rock of a columnar joint cavern project, which can be widely used in excavation and support projects of columnar joint rock mass in water conservancy and hydropower, transportation, underground test sites and the like. Background technique

[0002] Columnar joints are a kind of regular columnar primary tensile fracture structure commonly found in volcanic lavas. The columns are basically perpendicular to the extension direction of the lava layer, and the internal joint fissures are abnormally developed. This joint includes columns and columns. The joints between them also include the recessive joints randomly developed inside a single column, and the columnar joint rock mass often presents a mosaic structure. The columnar jointed rock mass is prone to relaxation and cracking under the action of excavation and unloading, the self-stabilization time is short and t...

Claims

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