A test system and monitoring method for water and sand migration of mining-broken rock mass

Abstract

The invention discloses a mining-induced fractured rock mass water sand transportation testing system and a monitoring method. The mining-induced fractured rock mass water sand transportation testing system comprises a support which is provided with a testing bin; the testing bin comprises an upper bin body and a lower bin body; a plurality of pressure sensors are uniformly configured in the upper bin body; a plurality of pore water pressure sensors are uniformly configured in the lower bin body; a sand layer is laid in the upper bin body; rock layers with different lithology and lumpiness are laid in the lower bin body; when a top plate moves downward, the loose sand layer and the rock layers are compressed gradually; a crisp epoxy resin water-stop plate also moves downward; the tip end part of a fracturing rod fractures the crisp epoxy resin water-stop plate, so that the upper bin body and the lower bin body are communicated. The transportation and gush simulation test of a water and sand mixture in fractured rocks can be carried out; water and sand transportation parameters of different ground layer combinations can be obtained; the reliability of characteristic recognition of gushing water and crushed sand disasters at a working surface induced by coal mining is improved.

Description

technical field [0001] The invention relates to a water-sand migration test system and a monitoring method of a mining-broken rock mass. Background technique [0002] In recent years, with the continuous increase of coal mine mining intensity and the continuous increase of the mining upper limit, the overlying loose aquifer is affected by mining, and the water-sand mixture with high sand content breaks into the underground working face, resulting in property losses and even casualties. Geological disasters occur from time to time, which pose a great threat to mine safety and seriously restrict the development of the coal industry. On April 20, 1990, the Ciyaowan Coal Mine suffered a disaster of roof fall, water inrush and sand inrush, with water gushing up to 200m 3 / h, the total amount of broken sand is 4000m 3 Above, the 304m-long belt roadway in the first mining area was filled with sand to a thickness of 2m (the roadway height is 4.5m), and a conical collapse pit (28m ...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the continuous increase of coal mine mining intensity and the continuous increase of the mining upper limit, the overlying loose aquifer is affected by mining, and the water-sand mixture with high sand content breaks into the underground working face, resulting in property losses and even casualties. Geological disasters occur from time to time, which pose a great threat to the safe production of mines and seriously restrict the development of the coal industry

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