Weibei P-C Coalfield Geological Tectonic Development Control Characteristics Of Groundwater

Weibei P-C Coalfield is one of the important coal production base in Shaanxi province.In recent years,with the coal resource development speed,the mining area of coal mining todeep gradually,Ordovician limestone karst water coal-bearing sedimentary basement hasbecome the main factors threatening the safety production of mine. Ordovician limestonekarst water with water,regional water dynamic field characteristics of stability,and theinfluence of mining large Eastern coalfield.This paper analyses the detailed study of the basic characteristics and hydrogeologicalcondition of geological structural development on Weibei coalfield, Discusses the geologicalstructure of Weibei coalfield hydrogeological unit boundary conditions, hydrologicalgeological unit division, the karst development and groundwater recharge, runoff, dischargeconditions; That geological structure plays the key role in the groundwater spatial distribution,formation and movement, control effect on the hydrogeological characteristics of the obvious.We draw the following conclusions:(1)In Weibei coalfield in the middle part of the mainfaults, things on both sides to fold. Direction of the tectonic line clear, mainly in the NorthEast, the main direction of the tectonic line can be divided into near EW, near SN, NW andNE of four groups.(2)the coalfield structure distribution density interaction, fault concentratedbelt, partition obvious zonation. Along the East-West from east to west and can be dividedinto the Hancheng-Heyang fault concentrated belt, Chengcheng Chengdong faultconcentrated belt, Luohe fault concentrated belt, Dongpo-duck mouth fault concentrated beltand the Tongchuan west fault concentrated belt5NE-trending fault concentrated belt; alongthe North-South from north to south, can be divided into F2dense layer with love, Tie villagefault concentrated belt and Dukang ditch-Heyang fault concentrated belt3east-west faultconcentrated belt.(3)dividing Heyao hydrogeological unit and Hancheng hydrogeological unit is roughly by the syncline and thrusts group the result of comprehensive effect.(4)compresso-shear faults, especially the formation of regional faults, water blocking faultsobviously; tenso-shear faults or cutting in the tenso-shear fault zone, water effect faultobviously;(5)development in fold axis and the turning point, is the enrichment of the regionalgroundwater;(6)the karstic collapse column hydraulic properties are very different, althoughthe vast majority of collapse column is not water, but subsided column once water, is oftendisastrous.