基于“时空效应”原理的邻近地铁深大基坑土方开挖施工组织和实践

Construction Organization and Practice on Earth Excavation of Deep-Large Foundation Pit Adjacent to Subway According to Principle of “Time-Space Effect”

以某邻近地铁的超大深基坑施工为例,详细介绍了深基坑的支护和土方开挖技术。由于基坑距离既有地铁线路较近,为更好地保护地铁,根据时空效应原理,按照"分层、分块、对称、平衡、限时"的原则,采用分坑施工、分区开挖的方案,各分基坑内土方再按照"盆式+台阶式"开挖的形式进行施工,取得了理想的效果,保证了地铁的正常运营。

Taking the construction of a deep-large foundation pit adjacent to subway as an example, the earth support and excavation technology of deep foundation pit is introduced in detail. Because the foundation pit is close to the existing subway line, in order to protect the subway better, according to the principle of time-space effect as well as the principle of 'stratification, partitioning, symmetry, balance, time limit', the scheme of separate pit construction and divisional excavation is adopted. The earth in the separate pit is constructed in the form of 'basin type + terrace type' excavation, which has achieved ideal results and guaranteed the normal operation of the subway.