承压含水层局部降压引起土体沉降机理及参数分析.pdf

TU463 A 2014 (1967 ) E-mail: zhenggang1967@163.com Settlement mechanism of soils induced by local pressure-relief of confined aquifer and parameter analysis ZHENG Gang1, 2, ZENG Chao-feng1, 2, XUE Xiu-li 3 1. Key Laboratory of Coast Civil Structure Safety (Tianjin University), Ministry of Education, Tianjin 300072, China; 2. School of Civil Engineering, Tianjin University, Tianjin 300072, China; 3. Mechanics Departments, Tianjin University, Tianjin 300072, China Abstract: By carrying out the in-situ pumping tests on confined aquifer in Tianjin, it is found that the settlement of soils of overlying confined aquifer gradually increases up to down during local relieving, meanwhile, heave appeares in underlying soils. Further analysis, by using three-dimensional fluid-solid coupling numerical model, indicates that the soil-arch effect will form in soils, which has no drawdown and overlies confined aquifer during its local relieving, in the meantime, the additional tensile stress and tensile deformation appeare there, and moreover, the seepage force is the reason why the soils underlying the confined aquifer heave. Furthermore, the law of grou