Numerical simulation method for coal mine abscission layer water periodical water inrush disaster

Abstract

The invention discloses a numerical simulation method for a coal mine abscission layer water periodical water inrush disaster. The method comprises the following steps that a numerical calculation model is established, the whole model is composed of 12 coal rock layers, the fourth layer above a second coal bed is a main sandstone aquifer, and the third mudstone layer is a key waterproof layer; when the key waterproof layer is 20 m, the length of the model in the moving direction is 600 m, the height is 300 m, the model is divided into 65,750 250*263 units, and rock mass only bears gravity stress ad water pressure; according to boundary conditions, the two ends are horizontally restrained, the bottom end is fixed, and the periphery is arranged to be a waterproof boundary. The development process of a water guide fracture is simulated through step-by-step excavation; excavation is started from the position 100 m away from the left side of the moving direction of the model, 400 m is excavated in total with the height of 5 m, 10 m is excavated in each step, and totally 40 steps are included. A computer numerical simulation means is adopted to simulate an abscission layer formation process, and periodicity of the secondary roof abscission layer water disaster is summarized.

Description

technical field [0001] The invention relates to the field of water disaster prevention and control of coal seam roof abscission layer, in particular to a numerical simulation method for disaster caused by periodic water inrush of coal mine abscission layer water. Background technique [0002] Water disasters occur frequently in my country's coal mines, especially when there is no strong aquifer, and the roof breaks cause disasters. For example, Shenhua Ningxia Coal Group Hongliu Coal Mine No. 2 Coal Mining Mine The water filling water source mainly comes from the bottom of the Jurassic Zhiluo Formation on the roof Coarse sandstone fracture-porous aquifer, the aquifer is weak in water-rich. The 1121 working face started back mining in September 2009 and advanced a total of 186m from March 2010 to March 2010, but experienced 4 concentrated water inflows, with a maximum water inflow of up to 3000m 3 / h. Yuhua Coal Mine 4, Jiaoping Mining Area, Tongchuan, Shaanxi -2 The water ...

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Problems solved by technology

At present, the research results mainly focus on the formation mechanism and distribution of the separation layer, and the engineering application of the separation layer grouting to reduce settlement, but there are few studies on the formation conditions of the separation layer water and the mechanism of the inrush water, especially the separation layer water The law of dynamic periodicity is rarely reported

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