紧邻立交桥的连续墙受力分析和安全性评价
Force analysis and security assessment of diaphragm walls adjacent overpasses

以深圳地铁车公庙交通枢纽7 & 9号线车站深基坑工程为研究背景,选取典型的监测断面,埋置混凝土应变计,进行地下连续墙的内力测试,分析了连续墙在深基坑开挖过程中的内力变化规律,并对连续墙的安全性进行了评价,得到以下结论:随着基坑开挖深度的增加,地下连续墙的内力变化越发明显,基坑负二层和负三层开挖对连续墙的内力变化影响较大,应重点关注和监测;根据现场测试数据得到两侧地下连续墙的内力变化并非完全一致,主要受到紧邻基坑开挖和周边建筑物的影响;最后计算得到地下连续墙处于安全状态。
A typical measurement-section was selected, and concrete strain meters were embedded to make measurement for diaphragm walls on the construction of Station of Metro Line 7&9 of Chegongmiao Station of Shenzhen Metro. The internal force change of diaphragm walls was discussed, and the reliability of diaphragm walls was evaluated. Results showed that with the increasing of the excavation depth of foundation pits, the variation of stresses of diaphragm walls was observable. According to the strain data from field measurement, safety factors of diaphragm walls were calculated, which turned out to meet national code. Meanwhile, it can be concluded that diaphragm walls were in the safe status. In the end, the variation relationship of their internal force, which would provide some references for the design and construction of similar projects in the future, was obtained.