Amplification phenomenon and mechanism analysis of ground fissure activity rate in Jiaocheng fault

Abstract

Jiaocheng fault ground fissure is the longest ground fissure extending intermittently in Fen Wei fault depression zone. The occurrence and development of ground fissures are affected by rainfall, groundwater pumping, fault activity, strata and other factors. The research shows that with the rainwater flowing down and replenishing the confined water layer, there will be undercutting, scouring and hollowing, which will aggravate the development of ground fissures; In the structural area, due to the multi-stage activity of the fault, a strong tensile stress area is formed, resulting in the rapid reactivation, expansion and rebirth of the ground fracture. At the same time, there is a thicker and finer silty clay layer that is easier to lose with water, which is another incentive factor for the rapid development of the ground fracture. However, when the tectonic action causes the dislocation of the aquifer and water resisting layer and blocks the loss of formation materials, the ground fracture will lose its development conditions. Jiaocheng fault is the main controlling factor for the shaping, formation, development and continuous influence of the geological environment of Jiaocheng ground fracture, while precipitation, groundwater exploitation and natural discharge are the incentive factors, and the loss of stratum material is the necessary condition. The North basin of Tianzhuang fault cannot form ground fracture without necessary conditions.