Pumping-induced stress and strain in aquifer systems in Wuxi,China |
| |
| Authors: | Yun Zhang Jun Yu Xulong Gong Jichun Wu Zhecheng Wang |
| |
| Institution: | 1.School of Earth Sciences and Engineering,Nanjing University,Nanjing,China;2.Key Laboratory of Earth Fissures Geological Disaster,Ministry of Land and Resources (Geological Survey of Jiangsu Province),Nanjing,China |
| |
| Abstract: | Excessive groundwater withdrawal from an aquifer system leads to three-dimensional displacement, causing changes in the states of stress and strain. Often, land subsidence and sometimes earth fissures ensue. Field investigation indicates that land subsidence and earth fissures in Wuxi, a city in eastern China, are mainly due to excessive groundwater withdrawal, and that they are temporally and spatially related to groundwater pumping. Groundwater withdrawal may cause tensile strain to develop in aquifer systems, but tensile strain does not definitely mean tensile stress. Where earth fissures are concerned, the stress state should be adopted in numerical simulations instead of the strain state and displacement. The numerical simulation undertaken for the Wuxi area shows that the zone of tensile strain occupies a large area on the ground surface; nevertheless, the zone of tensile stress is very limited. The zone of tensile stress often occurs near the ground surface, beneath which the depth to the bedrock surface is relatively small and has considerable variability. Earth fissures often initiate near the ground surface where tensile stress occurs. Tensile stress and earth fissures rarely develop at the centers of land subsidence bowls, where compressive stress is dominant. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
