Abstract

The mechanical characteristics and stress distribution of wall rock of the deep buried and pressed chamber have great significance to the engineering science design and safety. Generally speaking, the lithology of the wall rock and its structure characteristics varies accordingly. However, all of them have certain ability of resisting pressure. Our study showed that the hydraulic jacking test can well display the in-situ stress bearing capacity of the chamber surrounding rock. It also showed that the 3-D hydraulic fracturing stress measurement not only can determine the possible stress relaxation of the chamber surrounding rock and stress concentration area, but also give the reliable three-dimensional stress distribution with depth.

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