Numerical Simulation Analysis Of Geostress For Baiping Sliding Structure In The Western Of Henan Province

Geostress is an essential force and is a main power of coal and gas outburst,which causes the deformation and failure of the tunnel and other underground geotechnical engineering.Due to the development of sliding structures and faults in Bai Ping field,it leads to the distribution of stress in mining field that is quite complex.Geostress is gradually increasing with the increase of mining depth and the degree of danger of coal and gas outburst is also growing,which has become a major factor that endangers the safe operation of coal mines.Therefore,it is important to predict and prevent a coal and gas outburst,which can fully understand the characters of geostress distribution near the sliding structure zone.On the basis of predecessors' research,it is based on the regional measured stress,mine exploration and production data and it combines the finite element software ANSYS and Flac3 D to stimulate for the geostress distribution of Baiping sliding structure,which comprehensively analyses the distribution of the Bai Ping sliding structural belt and discusses its influence on coal and gas outburst.The main research achievements are as follows.(1)There are mainly three periods of tectonic movement and sliding structures develops in Bai Ping field;The present stress field is maximum horizontal principal stress,which is nearly east-west and the vertical stress is intermediate principal stress in Baiping field;the degree of gliding structure,lithology and topography are the main factors to influence the geostress distribution.(2)The regression analysis is conducted for stress along with the change of buried depth,which is based on the measured stress data.A three-dimensional models of Bai Ping sliding structural belt and its near are established,which combine with geological datas between field drilling reveal and production reveal.The simulation results show that the sliding structure is the main factor causing uneven distribution of geostress.Geostress decreases in Bai Ping sliding structural belt and near fault zone and the horizontal and vertical principal stress is larger in the undermass of sliding layer structure.Meanwhile,stress concentration is the most significant on the turn end of sliding structure,decreases on the sliding structure fracture zone and changes little on the bedding of sliding structure.(3)Geostress has an important control function on coal structure,coal seam permeability and gas pressure.The high stress area of Bai Ping sliding structure belt and near the fault have some dynamic phenomena.