水井抽水引起地基沉降的离心模型试验研究  

Centrifuge modeling of ground settlement due to groundwater pumping

作　　者：孙振岳[1] 张嘎[1] 张建民[1] 李国和[2] 郑瑞华[1] 

机构地区：[1]清华大学,北京100084 [2]铁道第三勘察设计院,天津300142

出　　处：《土木工程学报》2008年第4期67-72,共6页China Civil Engineering Journal

基　　金：国家重点基础研究发展计划(2007CB714108);北京市自然科学基金(8061003)

摘　　要：地下水的开采是引起地面沉降的重要因素之一。通过离心模型试验研究抽水引起的地基变形。研制一套离心场中地基抽水的模拟和测量系统。进行离心模型试验,测量抽水过程中粉土地基孔隙水压力和沉降的变化及分布规律,探讨渗透作用对地面沉降发展规律的影响。试验结果表明靠近抽水位置区域的地基变形大于远离抽水位置区域,排水引起的地基沉降量与其不均匀程度随着排水次数和沉降的增大有逐渐减小的趋势。在地下水开采过程中,地基侧向变形也是引起地面沉降的重要影响因素。地基渗流场变化强烈的发展阶段对于地基沉降的影响值得关注。Groundwater exploitation is one of the main reasons for ground subsidence. Centrifuge model tests were conducted to investigate the ground settlement due to groundwater pumping. A drainage system was developed to simulate water pumping during centrifuge tests. The histories of pore pressure and deformation of the soils were measured during the centrifuge model tests. The results indicate that soil deformation decreases with increasing distance from the well. The absolute and differential settlements due to groundwater pumping decrease with increasing the number of exploiting cycles. During water exploitation, the lateral deformation of the soil plays an important role for the ground settlement. Attention should be paid to the influence of the period during which the seepage field changes intensively.

关 键 词：地基沉降 离心模型试验 渗流 有效应力 

分 类 号：TU433[建筑科学—岩土工程]