Study On Rock Strata And Surface Movement Law Under The Railway Filling Mining With Superhigh-water Material

The coal resource is one of the main energy in our country, in recent years, the exploitation of coal resources is expanding, "three"(under buildings, railway, water under pressure) of coal issues have become increasingly prominent, seriously restricted the stable production and the sustainable development of mine. How to effectively relieve the railway under the pressure of coal is one of the main problems in mining area "in the east of China is facing three" mining, improve the recovery rate and ensure the safe running of the train is the core of the study on mining under railway. This topic takes 12706 working face of Handan Coal Group Tao Yi Mine under Handan railway by superhigh-water material backfilling mining as the background, according to the full goaf caving and superhigh-water material backfilling, caused by different treatment schemes of overlying strata and surface movement and deformation laws of theoretical analysis; numerical simulation using FLAC3 D software, carry out numerical simulation of filling mining overlying strata and surface movement law; through field monitoring and numerical simulation analysis to take surface with superhigh-water material filling technology of settlement deformation. Through the above research, provide the basis for the railway road, Stubbs road maintenance measures, so as to ensure the safety of railway operation in the mining process, selection of superhigh-water material bag filling scheme provides the technical basis and reference for other coal mine "three" for the mine by filling mining.A special method of mining with superhigh-water material bag filling mining coal under railway as solving the problem, the ability to Control of roof and filling body surface, with abundant raw materials, simple production process, rapid hardening, early strength grouting material(two single A or B slurry) has the advantages of good fluidity, consolidation volumetric strain of initial setting time is adjustable, the small, can effectively reduce the rock and ground surface settlement, can bring remarkable economic benefits and social benefits for the mine. Analysis and field monitoring results, the probability integral numerical simulation, draw the following conclusion: surface displacement monitoring results show that: super high water material filling mining can effectively slow down the surface subsidence; super high water material filling rate reached 80%, the surface does not appear sudden subsidence, subsidence, horizontal displacement and the extent of damage in the controllable within the scope of the mining, railway line is not needed in the process of outage renovation, only a small routine repair of the railway, the train can safely pass the slowdown. The full caving mining overlying strata are usually formed a regular distribution of "three zones", and the ultra high water material filling mining caving zone generally does not exist, and bending zone height decrease cracks, subsidence parameters and all caving method has significant difference, the subsidence coefficient is larger than all the caving method. The filling rate, the size of the working face mining influence of overlying strata and surface different results, should be based on different working faces, take proper filling rate, ensure the sudden sinking in filling mining on the stability of overlying strata, the prevention of surface, to ensure the safe operation of the railway.