Surrounding rock crack growth dynamic monitoring method and monitoring apparatus thereof

Abstract

The invention relates to a surrounding rock crack growth dynamic monitoring method and a monitoring apparatus thereof. The monitoring method comprises the following steps: punching the inside of a surrounding rock along a direction vertical to the sidewall of the surrounding rock to form a borehole; fixedly arranging airbags in the borehole at certain intervals, and connecting the airbags to an air inflation tube; sending a tester to the borehole, and fixing the tester to a position to be tested; introducing air to the air inflation tube to make all the airbags connected with the air inflation tube be in full contact with the inner wall of the borehole and a cavity be formed between two adjacent airbags, and connecting cavities to water flooding tubes; and sequentially flooding water into cavities from the deep part to the shallow part of the borehole through the corresponding water flooding tubes, recording to the water flooding amount of every cavity, and determining the surrounding rock crack growth condition according to the size of the water flooding amount. A surrounding rock loose range can be measured multiple times only through once punching, so the operation is simple, and the construction cost is reduced; and tests can be simultaneously carried out in different positions of a same tunnel at different times to obtain the time and space evolution rules of the tunnel surrounding rock loose range, and bases are provided for tunnel support design.

Description

technical field [0001] The invention relates to testing of surrounding rock loose circles, in particular to a dynamic monitoring method and monitoring equipment for the development of surrounding rock fissures. Background technique [0002] The loose ring theory has been widely recognized and promoted in the field of underground space development and utilization, especially the loose ring support theory has played a huge role in the production and safety of coal mines. After the roadway is excavated, the stress of the surrounding rock is redistributed, and a stress change area appears in the surrounding rock, and stress concentration occurs in this area. When the stress value exceeds the strength limit or yield limit of the surrounding rock mass, the surrounding rock mass of the roadway ruptures. Make a certain range of cracked areas around the roadway, that is, the surrounding rock loose circle. The loose circle reflects the universal objective physical and mechanical stat...

AI Technical Summary

Problems solved by technology

[0003] The traditional method of measuring the range of the loose circle is to drill a hole in the surrounding rock and place a measuring instrument in the hole for measurement. Due to the damage in the surrounding rock, the hole is often buried. If multiple measurements are required, it is necessary to repeat the measurement. Drilling, the construction cost increases, and the position of each punching cannot be guaranteed to be exactly the same, and the same test point cannot be accurately and scientifically measured, and the test results obtained are inaccurate

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