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为分析相邻基坑开挖过程中共用连续墙的受力变化规律,以深圳地铁车公庙枢纽共用地下连续墙为研究对象,选择一个典型断面进行监测。通过在共用连续墙D内埋置混凝土应变计,得到现场测试2基坑施工全过程的受力情况,并以此评价共用连续墙D的安全性。结果表明:共用地下连续墙D处于安全状态;随着基坑的开挖深度增加,大多数测点的应变值呈增长趋势,轴力和弯矩变化越来越大;共用连续墙D受紧邻基坑开挖影响明显,内力变化较大。
In order to analyze the force variation of common diaphragm wall during the excavation of adjacent foundation pit, taking the common diaphragm wall of Chegongmiao junction of Shenzhen Metro as the research object, a typical section is selected for monitoring. By embedding the concrete strain gauge in the common continuous wall D, the stress of the whole process of the foundation pit test 2 is obtained and the safety of the common continuous wall D is evaluated. The results show that the common diaphragm wall D is in a safe state. With the increase of the excavation depth of the foundation pit, the strain values of most measuring points show an increasing trend, and the axial force and bending moment change more and more. Excavation excavation obvious internal force changes.