基于嵌固稳定安全系数的悬臂结构优化设计  

OPTIMIZATION DESIGN OF CANTILEVER STRUCTURE BASED ON EMBEDDED STABILITY FACTOR

作　　者：高幸 王维玉 丁继辉[3] GAO Xing;WANG Wei-yu;DING Ji-hui(HeBei Jian Ke Tang Qin Building Science and Technology Co.Ltd,Tangshan,Hebei 063009,China;Research Institute of Architecture Science of Hebei,Shijiazhuang,Hebei 050021,China;School of Architecture and Engineering,Hebei university,Baoding,Hebei 071002,China)

机构地区：[1]河北建科唐秦建筑科技有限公司,河北唐山063009 [2]河北省建筑科学研究院,河北石家庄050021 [3]河北大学建筑工程学院,河北保定071002

出　　处：《工程力学》2020年第S01期51-56,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(51678112);国家重点研发计划项目(2018YFC1505300-2);河北省科技厅项目(162176486)。

摘　　要：常规基坑支护设计沿用传统的平面设计方法,而基坑作为一个具有长、宽、深的三维空间体系,平面设计无法满足基坑三维空间结构的特点。基于基坑的空间特性,提出依据坡顶水平位移反推空间效应影响下的主动土压力与被动土压力的计算方法。参考现行规范计算空间效应影响下的嵌固稳定安全系数,以嵌固稳定安全系数最小值(最危险状态)作为优化标准,提出悬臂支护结构优化设计方案。研究表明:基坑开挖时主动土压力与被动土压力同时受到空间效应的影响,但主动土压力相对于被动土压力受空间效应影响更加明显。嵌固稳定安全系数随距坑角距离的减小而呈幂函数形式增大。The method of plane design is adopted by the design of foundation pit support.As a three-dimensional space system with long,wide and depth,the plane design of foundation pit cannot meet the characteristics of three-dimensional space structure of a foundation pit.Based on the spatial effect of a foundation pit,the calculation method of active soil pressure and passive soil pressure under the influence of horizontal displacement of slope roof is proposed.With reference to the current specifications,the embedded stability safety factor under the influence of space effects is calculated,and the minimum embedded safety factor(the most dangerous state)is used as an optimization criterion to propose an optimal design scheme for a foundation pit,a cantilever supporting structure.The study results show that:the active soil pressure and the passive soil pressure are affected by the space effect simultaneously during excavation,but the active soil pressure is more affected by the spatial effect than the passive soil pressure.The embedded stability safety factor increases as a function of power as the distance from the pit angle decreases.

关 键 词：空间效应 土压力 悬臂支护结构 嵌固稳定安全系数 优化设计 

分 类 号：TU473[建筑科学—结构工程]