国家开发银行办公楼基坑土层抗剪强度指标反分析

Back Analysis of Soil Shear Strength Index on the Foundation Excavation of China Development Bank Office Building

土层抗剪强度指标是基坑工程支护设计的重要参数,限于室内试验方法和条件等因素,使得试验结果往往与原位土体的真实抗剪强度指标值存在较大差异。采用文献给出的ACE土层参数反演分析模型对土层抗剪强度指标进行反分析,选择基坑桩体水平位移作为实测目标,经过回归分析获得基坑桩体水平位移和土层抗剪强度指标之间的响应面,在此基础上,利用Monte Carlo模拟与筛分原理对土层抗剪强度指标进行反分析,为今后类似基坑工程的设计与施工提供依据。

The soil shear strength index is an important parameter of foundation excavation supporting design. Due to the factors such as test method and condition,the test results often have some difference with the situ soil shear strength indexes. In this paper,the soil parameter back analysis model based on ACE is adopted to analyze the soil shear strength indexes. The excavation pile horizontal displacement is chosen as the measured target. Then through the regression analysis,the response surface between foundation excavation horizontal displacements of pile and the soil shear strength indexes is obtained. On this basis,the Monte Carlo simulation and screening principle are used to analyze the soil shear strength indexes. It provides the reference for the design and construction of the future similar foundation excavation engineering.