Sectional test method for mining damage range of surrounding rock

Abstract

The invention discloses a segmented testing method for mining damage of surrounding rock, which belongs to the technical field of determination of the damage range of rock mass on the roof and floor of mines. It solves the problems of one-time plugging and multi-segment measurement, plugging and leakage measurement integration and internal water pressure conversion measurement of mine roof and floor rock mass observation equipment. The test system used includes a plugging system, a guiding system, a supply propulsion system and a pressure conversion system. The plugging unit of each plugging system includes a leaking pipe and tubular joints connected to both ends of the leaking pipe. There is a connecting pipe between the units, and the two ends of the connecting pipe are respectively connected to the tubular joints of the adjacent sealing units. A sealing capsule is arranged on the periphery of the leaking pipe between the two tubular joints. A certain closed space is formed between them. The testing method of the invention can simultaneously realize the multi-stage measurement of one-time plugging, the integration of plugging and leak detection, and the pressure conversion from plugging high-pressure water sources to observing low-pressure water sources.

Description

technical field [0001] The invention belongs to the technical field of measuring the damage range of rock mass on the roof and floor of a mine, and in particular relates to a segmented test method for the damage range of surrounding rock mining. Background technique [0002] The measurement of the damage range of rock mass on the roof and floor of mine is an important parameter to indicate the occurrence state of coal rock. It is a key basic parameter in the study of mine water prevention and control. Therefore, to study the formation of water-conducting channels in mining surrounding rocks, it is necessary to grasp the movement rules of rock strata and determine the damage range of roof and floor rock mass. Numerical simulation, empirical formula prediction, field measurement and other methods are usually used. [0003] However, due to the complex site conditions, to a certain extent, the numerical simulation cannot reflect the site conditions well, and the blindness of th...

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Problems solved by technology

[0003] However, due to the complex site conditions, to a certain extent, the numerical simulation cannot reflect the site conditions well, and the blindness of the empirical formula is relatively large. As the mining depth increases, the applicability of the empirical formula becomes worse and worse.

First of all, due to the excessive number of pipelines working at the same time in the existing observation equipment, especially during the propulsion process, the problem of pipeline entanglement in the borehole is prone to occur. The observed water pressure is generally 0.1MPa, and the observed water source pressure in the borehole should not be too high, otherwise, it will cause expansion of the original cracks in the borehole wall

Under the same external water source, how to make the plugging water source and the observation water source in the integrated observation equipment work at the same time under their respective pressures? Finally, because the drilling length is approximately 50-70m, the test site often uses a single-stage water injection observation instrument. Advance the measurement length (about 1m), too many advances will greatly increase the manual workload, which may affect the measurement accuracy

The prior art fails to solve the above three problems simultaneously

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