高幸, 王维玉, 丁继辉. 基于嵌固稳定安全系数的悬臂结构优化设计[J]. 工程力学, 2020, 37(S): 51-56. DOI: 10.6052/j.issn.1000-4750.2019.03.S005
引用本文: 高幸, 王维玉, 丁继辉. 基于嵌固稳定安全系数的悬臂结构优化设计[J]. 工程力学, 2020, 37(S): 51-56. DOI: 10.6052/j.issn.1000-4750.2019.03.S005
GAO Xing, WANG Wei-yu, DING Ji-hui. OPTIMIZATION DESIGN OF CANTILEVER STRUCTURE BASED ON EMBEDDED STABILITY FACTOR[J]. Engineering Mechanics, 2020, 37(S): 51-56. DOI: 10.6052/j.issn.1000-4750.2019.03.S005
Citation: GAO Xing, WANG Wei-yu, DING Ji-hui. OPTIMIZATION DESIGN OF CANTILEVER STRUCTURE BASED ON EMBEDDED STABILITY FACTOR[J]. Engineering Mechanics, 2020, 37(S): 51-56. DOI: 10.6052/j.issn.1000-4750.2019.03.S005

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

  • 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。

     

    Abstract: 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.

     

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