摘要
Abstract
In order to effectively ensure the safety of foundation pit construction,considering the actual situation of the project,and based on the preliminary selection of the foundation pit support scheme,a quantitative support scheme evaluation system is constructed through the Analytic Hierarchy Process(AHP),the 1-9 scale method,and the fuzzy method to determine the optimal support scheme.At the same time,based on the deformation monitoring results during the construction process of the foundation pit,the deformation control effect of the foundation pit support scheme is evaluated through the current statistical analysis and the deformation prediction analysis in the prediction stage.The analysis results show that:combined with the actual situation of the project,there are mainly four types of preliminary selection schemes for the foundation pit support,namely"diaphragm wall+internal support","bored pile+anchor cable+internal support","steel-reinforced cement-soil mixing retaining wall+internal support",and"slope excavation+soil nail wall".After the evaluation of the support schemes,the comprehensive score of the applicability of the"bored pile+anchor cable+internal support"is relatively the highest,so it is selected as the foundation pit support measure.At the same time,through the analysis of the deformation results during the construction process of the foundation pit,whether in the current stage or in the prediction stage,the horizontal convergence of the foundation pit and the settlement of the buildings are within the range of the deformation control values,and there is still an ample remaining deformation space,which fully verifies the rationality of the foundation pit support scheme and accumulates experience for similar projects.关键词
基坑/支护设计/变形控制/BP神经网络/变形预测Key words
Foundation pit/Support design/Deformation control/BP neural network/Deformation prediction分类
土木建筑
