Surface settlements at a soft soil site due to bedrock dewatering
Surface settlements at a soft soil site due to bedrock dewatering
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DOI：
10.1016/j.enggeo.2009.05.006
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发表时间：
2009-08
影响因子：
7.4
通讯作者：
D. Roy;K. Robinson
中科院分区：
文献类型：
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作者：
D. Roy;K. Robinson
通过8米的软土和8米的砂岩和粉砂岩建造了一个16米深、55米宽、几乎是方形的地下结构，导致了广泛的定居点的发展。受影响的区域延伸到距离建筑周边200多米的地方。地下结构的楼板不是为水压力而设计的。因此，结构的运行需要连续泵送位于结构内最低标高的水池收集的渗漏水。建造该建筑物后5.75年期间获得的地下调查和监测数据表明，沉降是由于地下基岩内的含水层因建筑物运行所需的持续降水造成的减压而使软土固结所致。进行了一项分析性研究，以预测长期沉降。一个简单的分析模型可以用来合理地模拟复杂的水文地质问题。文中详细介绍了该地区的水文地质背景、地下调查和监测活动，以及预测长期沉降的分析模型。
Construction of a 16-m deep, 55-m wide, almost square, underground structure through 8-m of soft soils and 8-m of sandstone and siltstone led to the development of widespread settlements. The affected area extended to distances of over 200 m from the perimeter of the structure. The floor slab of the underground structure was not designed for water pressure. Thus, operation of the structure requires continuous pumping of seepage water collected at a sump located at the lowermost elevation within the structure. Subsurface investigation and monitoring data obtained over 5.75-year period following the construction of the structure indicated that the settlement resulted from consolidation of soft soils due to depressurization of an aquifer within the underlying bedrock caused by continuous dewatering needed for the operation of the structure. An analytical study was undertaken to project the long term settlement. A simple analytical model could be used to simulate the complex hydrogeological problem reasonably. The details of hydrogeologic setting, subsurface investigation and monitoring activities, and the analytical model for projecting long-term settlements are presented in this paper.