Multiple combined foundation pits are characterized by large scale investment, uncertainties, complicated construction technique, as well as the interplays among internal pits and so forth. Background with a deep combined foundation pit constructed by Shanghai Natural Museum and Metro Line 13, the entire pit group is divided in the light of dewatering, supporting structure and excavation procedures, the risk factors during the construction are I-dentified through questionnaire investigations, which are handed out in order to estimate the level of probability and losses. Finally, the weight of each risk factor is ascertained by analytic hierarchy process, thus the risk level of foundation pit group construction and the engineering process could be obtained.%多重组合式基坑具有投资规模大、不确定性因素多、施工技术复杂、内部基坑彼此相互影响等特点.以上海自然博物馆与上海轨道交通13号线共建组合式深基坑为背景,将一整体复杂的基坑群从基坑降水、支护结构以及基坑开挖施工工序进行分解,识别该基坑群施工期间的风险因素,并制作专家调查表；通过发放调查表对风险的概率等级和损失等级进行估值,最后通过层次分析法确定基坑中各子风险因素所占的权重,得出基坑群施工以及各施工工序的风险等级.
展开▼
