岩土力学2011，Vol.32Issue(11)：3306-3311,3324,7.
既有基坑延深开挖稳定性评价与支护方案确定
Stability evaluation and supporting scheme for deepening excavation of existing foundation pit
摘要
Abstract
Taking a foundation pit in Beijing as the background, the fast Lagrangian analysis of continua in 3 dimensions (FLAC3D numerical calculation program and Mohr-Coulomb constitutive model are adopted to make analysis of the deformation and force condition of pile-anchor supporting system on the case of deepening excavation of the existing foundation pit. Calculation results show that the deepening excavation will induce poor bending performance of pile, larger horizontal displacement of supporting structure and failure of anchor system based on the existing supporting scheme. In order to ensure stability of the foundation pit, increasing pile fulcrum is necessary. Several reinforcement schemes are compared on the basis of design change and construction condition. The scheme of increasing anchor cable is adopted to reinforce the foundation pit. The mechanical behavior of foundation pit after deepening excavation with above supporting scheme is analyzed by using numerical simulation. The calculated deformation of foundation pit and supporting system is compared with field monitoring data; and the result shows that the scheme is reasonable. So the research results are of significance as a reference for similar engineering.关键词
基坑加固/桩锚支护/嵌固深度/FLAC3D/水平位移Key words
pit reinforcement/pile-anchor reinforcement/embedded depth/FLAC3D/horizontal displacement分类
建筑与水利引用本文复制引用
蔡海波,吴顺川,周喻..既有基坑延深开挖稳定性评价与支护方案确定[J].岩土力学,2011,32(11):3306-3311,3324,7.基金项目
国家863计划资助项目(No.2009AA11Z105) （No.2009AA11Z105）
教育部新世纪优秀人才支持计划(No.NCET-06-0084). （No.NCET-06-0084）
