A Study On The Engineering Geology Characteristics And On The Mechanics Of Water And Sand Bursting From The Overlying Strata Of Mining Coal Seam In Qidong Coalmine

This topic is a multi-disciplinary study which synthesizes the sedimentation, the geology of mine, the structural geology, the petrology of coal, the mechanics of rock masses, groundwater dynamics and so on. While widely collecting and reorganizing materials of drilling, borehole log, mine construction and production from the northern Anhui Coal Electricity Group Qidong Coalfield, rock and soil samples were picked and selected to carry on the soil mechanics experiments and the rock physics mechanical properties tests. Beginning with the consideration of all the geologic factors, this paper analyzes the ability of water-segregating of "3rd aquifuges", the hydrogeological conditions and its seepage stability of "4th aquifers", the performance of water-segregating and aquiferous storage of the bedrock weathering zone and coal bearing formation, and the performance of waterproof pillars in Qidong coal mine. This paper evaluates the rule of ground water dynamic change and the permeate stability of the water-bearing stratum. By means of the heights of water flowing fractured zone from the "two belts" drilling ,the dissertation makes use of the numerical simulation, simulates and analyses the distributional characteristic and law of the distortion and destruction of the rock in the 3₂ coal bed worked-out area, presents the maximum heights of water flowing fractured zone and maximum heights of rock caving zone in the 3224exploration workplace .It also proposes a reasonable and secure plan of waterproof pillars remaining and setting. Ensure a secure and reasonable underwater mining and the safety of the mine pits and the miners.