近风氧化带开采导水裂隙发育规律及机制分析

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Abstract Nonlinear statistical analysis of heights of zones with water transmitting fractures at three different grades of underwater mining beneath various roof rocks was conducted with the regression method and the measured data of 40 drillings. A BoxLucas1 curve between the ratio of heights of fractured to mining zones and the height of waterproof coal pillar was established，which produced smaller errors than the conventional empirical formula did. The slopes of curves for 3 types of water gradually increased and the values of types II and III were greater than that of type I，which indicated that the height of water transmitted fractured zone under water mining type I was more easily reduced by the inhibition effect of weathered and oxidized zone. The fracture of type III did not penetrate the weathered and oxidized zone as mining closing to this area and the top interfaces of water transmitted fractures of types I and II did not reach the bottom of the mud layer，which indicated that raising the upper limit of mining within a certain range was feasible. A displacement formula for tensile fracture surfaces of weathered and oxidized zone was proposed utilizing Paris?s formula of displacement and Crouch?s formula of discontinuous displacement. The calculated results show that the fractures are more easily closed due to the overlying gravity. The large plastic deformation of weathered and oxidized zone consumes the work by external forces and consumes splitting energy easily，which prevents water transmitted fractures from upward development.

Key words： mining engineering approaching to weathered and oxidized zone height of water transmitting zone ratio of the height of the fractured zone to the mining height developing mechanism

Received: 31 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I7/1319

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