Numerical Simulation Analysis Of The Effect Of Pumping Action On Concealed Fissure Activities

Nowadays,the ground fissure disaster is found in a large area of the world.At the same time,because of the scarcity of water resources,many areas will be mined underground water,and this initiative has sometimes become the cause of the destruction of ground fissures.The cracks in the city destroy the buildings,fault the underground pipelines and damage the roads,which brings huge economic losses to people,and also causes the waste of land resources.In order to prevent and control the ground fissure effectively,we must first clarify its extended activity pattern and mechanism.Based on the data of the ground fissures in Xi ' an area,in this paper,the plane distribution characteristics,profile assemblage characteristics and activity characteristics of the ground fissures in Xi ' an are summarized and analyzed,the pattern of the expansion of concealed ground fissures is summed up,and the expansion mode of the concealed crack is analyzed by using the theory of fracture mechanics.and the water content of soil,compactness,soil integrity and other internal factors and human activities,the influence of external factors such as tectonic action on the crack propagation of concealed ground is analyzed,and the effective stress principle is used to analyze the crack propagation of ground fissures in soil under pumping conditions,and the horizontal movement of aquifer under pumping condition is analyzed.Finally,the influence of pumping activity on concealed ground fissures is simulated from different angles by using Midas GTS software,and it is found that the distance between the pumping well and the concealed crack and the angle of ground fissure will affect the stress state of the ground fissure and the surrounding soil activity under the pumping condition.,whether it is pumping in the upper plate or in the lower plate,the vertical activity of the upper plate soil near the two sides of the ground fissure is higher than the vertical activity of the lower disk soil body;Under the pumping action,the soil compression zone will be formed near the pumping well,and the tensile region of soil will be formed with the increase of the distance,meanwhile,the existence of the concealed crack will also affect the stress propagation in the soil,The deformation activity of soil has a certain hindrance and amplification effect.