Ground cracks, as the name suggests, crack the ground, creating huge crevices or collapses. Since the Tangshan earthquake in 1976, it has gradually been recognized, with the increasing improvement of human production activities, more and more cracks have appeared in the city, which has a great impact on the living environment such as major buildings, structures, and linear engineering, and will endanger the safety of people's lives and property when serious.
The area with more serious development of cracks in the country is Xi'an City, Shaanxi Province, and the special geological conditions determine the development and growth of ground cracks. On the question of causes, there are two main assertions. First, groundwater over-exploitation, resulting in deformation of the compression layer above and below the aquifer. Second, the creepy deformation of the active fracture, so such ground cracks often have obvious directional spread. The study of ground cracks in Xi'an is relatively mature, because the collapsibility characteristics of loess soil and the influence of some active fractures in the region form a unique ground crack spread group.
In the past ten years, several large emergency water sources have been built in the Beijing Plain area, resulting in serious groundwater over-extraction, coupled with the creeping deformation of five important active faults in Beijing, and the comprehensive effect has caused regionally distributed ground cracks. Through ten years of investigation and research, the cracks in beijing have obtained detailed information in terms of distribution, quantity, scale and causes.
Developing ground crack 1 in Changping District
Ground crack 2 developed in Changping District
Deformation of the wall caused by cracks in the shunyi district
Deformation of the formation in the probe
Stratigraphic misalignment
Ground cracks in the Pinggu area
Ground crack 1 in Tongzhou District
Ground cracks in Shunyi District