岩土工程学报2016，Vol.38Issue(z2)：136-142,7.DOI:10.11779/CJGE2016S2022
坑底加固置换率对杭州地铁湘湖站深基坑安全的影响分析
Effects of reinforcement replacement rates at pit bottom on safety of deep foundation pit of Xianghu metro subway station in Hangzhou
摘要
Abstract
For the collapse accident of the second foundation pit at the north side of Xianghu station of Hangzhou metro line No. 1, a three-dimensional finite element model is established to simulate the whole excavation process of the deep foundation pit. Then, the effects of different reinforcement replacement rates at the bottom of pit on the safety of deep foundation pit of Xianghu station are analyzed. The results show that the reinforcement replacement rate has great influence on the lateral displacement and the moment of the diaphragm wall of the deep foundation pit when the replacement ratio is less than 60%. However, as the replacement ratio is greater than 60%, this kind of effect decrease obviously. The axial force on the inner support is also influenced obviously by the replacement ratio, which mainly shows that it has the maximum effect on the lowest inner support. By contrast with the collapse accident of the pit of Xianghu subway station, it is found that the major impact area of the moment of the diaphragm wall generated by different replacement ratios is consistent with the broken position of the diaphragm wall in the collapse accident. However, the retaining structures have no collapse when the bottom ground is reinforced, which proves again that the reinforced bottom of foundation pit plays a significant role in this accident.关键词
地铁车站/深基坑/地基加固/坍塌/有限元分析Key words
subway station/deep foundation pit/foundation reinforcement/collapse/finite element analysis分类
建筑与水利引用本文复制引用
刘雪珠,张艳书,顾蒙娜,庄海洋..坑底加固置换率对杭州地铁湘湖站深基坑安全的影响分析[J].岩土工程学报,2016,38(z2):136-142,7.基金项目
江苏省地质矿产勘查局科研项目（2013-科研-13）；中国博士后基金项目 （）
