A Quantitative Evaluation Method of Fault Water Inrush Risk

Abstract

The invention discloses a method for quantitatively evaluating the risk of water inrush from a fault, which specifically includes analyzing the nearest main water-rich aquifer connected by the fault according to the data, and obtaining the water pressure data P0 of the water-rich aquifer; Stop excavation when the fault is at a certain distance L; arrange test boreholes at the front section of the tunnel; use test boreholes to carry out water injection tests and record water injection flow and water injection pressure data; draw water injection flow and water injection pressure time-lapse curves to obtain fault water blocking pressure P1; Finally, calculate the fault safety factor n=P1 / P0; to judge whether the fault is safe, this method is based on the field measured data to carry out evaluation work, and can obtain the fault safety factor when the underground engineering passes through the fault excavation. This method is simple in principle and can effectively prevent the original state. The problem of water inrush in water-conducting faults during excavation without conducting water below.

Description

technical field [0001] The invention relates to the field of quantitative evaluation method for fault water inrush risk, in particular to a quantitative evaluation method for fault water inrush risk. Background technique [0002] Faults are one of the most common fracture structures. Faults cause stratum dislocation. Faults are in a broken state, generally in a loose structure, with weak overall strength and poor water resistance. Water inrush from faults is the most common form of water damage in underground engineering. Taking coal mines as an example, according to the statistics of relevant experts, about 80% of water inrush accidents are related to faults. [0003] There are mainly three types of water inrush from faults: the first type is the excavation of tunnels and roadways (abbreviated as tunnels) in underground engineering to directly expose the fault, and the fault itself is in a water-conducting state. ; The second type uses geophysical prospecting and drilling ...

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Problems solved by technology

[0003] There are mainly three types of water inrush from faults: the first type is the excavation of tunnels and roadways (abbreviated as tunnels) in underground engineering to directly expose the fault, and the fault itself is in a water-conducting state. ; The second type uses geophysical prospecting and drilling methods to detect that the fault does not contain water conduction. After the underground engineering excavation exposes the fault, the stress change caused by the underground engineering will disturb the fault, causing the activation of the fault, and the fault will cause water damage accidents; the third type The excavation of underground engineering does not directly expose the fault, but due to the small distance from the fault, the thickness of the water-proof rock pillar and the insufficient pressure bearing capacity, the fault water breaks through the water-proof rock pillar and enters the underground project

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