摘要
传统的基坑水平支护体系没有考虑连续破坏的问题,对基坑支护体系冗余度设计考虑不多。本文依据冗余度理论,对深基坑工程中水平支护体系进行分析,研究施工工况情况下支护结构中内支撑杆件的局部损坏对基坑的影响。采用拆除杆件法,对基坑水平支撑杆件损坏进行数值模拟,并根据冗余度理论判断损坏杆件的重要程度。对基坑水平支撑体系局部损坏在不同施工工况下对整个基坑的空间效应进行分析。结果表明,在不同工况下对水平支撑体系的轴力影响程度不同,会对相邻层水平支撑造成影响。另外,模拟结果验证了冗余度设计理论在深基坑工程中的重要性,为类似地下工程的模拟和深基坑冗余度深入研究提供参考。
The traditional horizontal support system of foundation pit does not consider the problem of continuous failure,and the redundancy design of foundation pit support system is not considered much.The theory of redundancy was introduced to analyze the horizontal support system in deep foundation pit engineering.The damage of horizontal bracing member of foundation pit was simulated numerically by using the removal method,and the importance of the damaged member was judged according to the theory of redundancy.The spatial effect of the whole foundation pit was analyzed under different construction conditions for local damage of the foundation pit horizontal support system.The results show that the influence degree of the axial force on the horizontal bracing system is different under different working conditions,which will affect the horizontal bracing of adjacent layers.It is suggested that redundancy analysis and optimization should be carried out in the design process of large and complex retaining structures,and that key elements should be monitored and protected intensively during the construction process.In addition,the simulation results verify the importance of redundancy theory in deep foundation pit engineering,so as to provide a reference for simulation of such collapse problems in underground engineering and further study of redundancy in deep excavation.
作者
宋利文
谭燕秋
Song Liwen;Tan Yanqiu(College of Civil Engineering,Hebei University of Engineering,Handan,Hebei 056038,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2019年第S01期321-326,共6页
Chinese Journal of Underground Space and Engineering
关键词
冗余度
水平支撑
工况
深基坑
redundancy
horizontal support system
working condition
deep foundation pit
作者简介
宋利文(1992—),男,河北黄骅人,硕士生,主要从事岩土工程、地下工程等领域的科研工作。E-mail:974205333@qq.com;通讯作者:谭燕秋(1964—),男,河北邯郸人,硕士,教授,主要从事钢结构教学、科研、和设计方面的工作。E-mail:387787459@qq.com
