Controlled Models Of Groundwater Flow With Geological Structure In Zhangji Mine In Huainan Coalfield

Huainan coalfield is located in the south margin of North China plate.It has experienced multi cycle and multi-stage geological tectonic movement,developed a large number of folds and faults.The geological tectonic conditions are extremely complex.Due to the control of the structure on the groundwater system,the hydrogeological conditions are particularly complex.The structural development characteristics and hydrogeological conditions of the study area are explored,and the control of the structure on the groundwater system is analyzed,In order to explore the regularity of structural water control,it is helpful to the safe mining of coal seam in the mining area.This paper takes Zhangji mining area of Huainan coalfield as the research object,uses the thinking mode of system theory,first studies the regional geological structure and hydrogeological characteristics of the research area,then starts with the regional structural unit of the research area,explores the structural characteristics of the research area,summarizes and summarizes the fracture structural combination patterns of the research area,grasps the hydrogeological conditions of the research area,and then studies Based on the regional geological structure and hydrogeological characteristics,focusing on the control effect of the overall characteristics of regional structure on the groundwater system,using the evaluation method of water yield and the dynamic change characteristics of groundwater,this paper discusses the control characteristics of the structure on the groundwater in the study area.Finally,it studies the characteristics of the water diversion type and the water resistance type structural model respectively,and uses flac.3d mathematical simulation to explore the water diversion type structure in Zhangji mining area.The influence of water control mode on mining effect.The research results are as follows:(1)The study area is mainly composed of fault structure and undeveloped fold structure.According to the structural style,it can be divided into seven types:graben,Horst and horst combination,normal(reverse)thrust structure,imbricate thrust structure,strike slip structure and "flower like" structure combination.(2)The water yield of the Cenozoic loose aquifer in the study area is affected by the Chenqiao anticline and Xieqiao syncline structure,which shows that the eastern area is moderately rich,the central area is weakly to moderately rich,and the western area is strongly to extremely rich.The water yield of coal bearing sandstone and limestone aquifer is controlled by Chenqiao anticline,Xieqiao syncline and fault structure in the area.Due to the relatively developed structure in the East,a series of spaces favorable for water storage,such as interlayer fissures,vertical and horizontal tension fissures and interlayer slippage,form a relatively water rich area;the structure in the west is the weakest,with almost no water storage space,so the water rich area is poor;although the central area is basically a squeeze fracture structure,with strong water resistance,the reverse fault has a large scale,many secondary faults,fissures,and water rich area The sex is stronger than that in the West.(3)The structural style plays an important role in controlling the water yield of aquifer.Among the seven types of fault structures,the maximum value,mean value and threshold value of Q value of the combined structure of graben and horst are all the largest,indicating that the water yield of Horst structure is stronger than that of graben structure;the water yield of positive(reverse)thrust structure and imbricated thrust structure is very weak,while the strike slip fault fracture is the same compressional fault,but due to its large scale and complex structure,the aquifer is rich in water Compared with other compressional structural styles,the "flower like"composite structural style has weak water yield.(4)The water controlling function of fold is mainly reflected in the turning end of fold,and it is easier to develop longitudinal tension fracture and detachment layer,so the water yield is strong in this area.For example,Chenqiao anticline shows obvious law of water yield enhancement in three main aquifers.(5)The water control model of fault in Zhangji mining area can be divided into water blocking type and water conducting type.Select the water conducting type fault Fs866 in the 1413A working face of Zhangji mine,and construct a mathematical model for comparative analysis.The simulation results show that due to the existence of the water conducting type fault,the plastic damage degree of the working face top and floor is strong,and the vertical stress of the rock is significantly greater than that of the fault free mining,which makes the fault activated and increases the possibility of water inrush.