【摘要】 结合工程实例,研究框架逆作法施工的超大深基坑的变形特性及其对周边环境的影响。基于该工程大量监测数据,分析得出:采用框架逆作施工能够很好地限制围护结构的变形,围护变形规律与常规施工方法基本一致;地表沉降量较小,但影响范围却远超过4.5倍开挖深度,不同于以往的地表沉降经验预测结果,降水是其影响范围广的主要原因;临近建筑物和地下管线差异沉降较小,沉降被控制在允许范围内。结果表明:框架逆作法可以有效地控制基坑的变形和保护周围环境。更多还原

【Abstract】 Combined with engineering case of a super-large deep excavation constructed by frame-top-down method,the deformation and effect on around environments are studied.According to analysis of the monitoring data,some conclusions are drawn as follows.(1) The deformation of retaining piles could be controlled well by use of frame-top-down method;and the deformation law is basically consistent with that by normal construction method.(2) The ground settlements are smaller,but the effect range is far excess of 4.5 times of excavation deep,which is different from the predicted results by former experience.Dewatering is the main reason of wide effect range.(3) The non-uniform settlements of the adjacent building and underground pipeline are small;and their settlements are controlled in allowable range.The results show that the deformation of excavation can be controlled and the around environment can be protected effectively by using this method.更多还原