摘要
圆形地连墙的空间受力机制是基坑工程研究热点之一,以往的理论研究大都聚焦其受轴对称荷载作用的解答,对非轴对称荷载的研究很少,而实际圆形基坑工程因土层不均匀、堆载不一致等因素而导致产生偏压的情况是普遍的。为了解析非轴对称荷载作用下圆形地连墙的空间受力机制,利用“分载法原理”将圆形地连墙的空间柱壳结构体系解构为竖向弹性地基梁和环向弹性地基曲梁的组合结构;给出了环向非轴对称的荷载下圆形地连墙按分载法计算内力与位移的详细推导流程。环向的曲梁符合圆形地连墙水平切面的几何特征,因此该方法既能考虑空间“拱效应”,又能简化原结构空间问题的求解,还能够直观地反映结构参数与内力变形的相互关系。通过两个数值案例验证了理论推导正确性,给出了环向和竖向分担系数的分布云图,结果表明圆形地连墙的环向刚度在承担水土荷载中起着绝对主导作用。
The spatial stress mechanism of circular diaphragm walls persists as a critical research focus in foundation pit engineering.Previous theoretical studies predominantly address axisymmetric loading conditions,with limited investigation of non-axisymmetric loading scenarios.However,eccentric pressure frequently develops in circular foundation pits due to soil heterogeneity and uneven pile loading.To analyze spatial mechanical behavior under non-axisymmetric loading,we deconstruct the column-shell system into vertically oriented elastic foundation beams and circumferentially arranged curved beams using load decomposition principles.We present a rigorous derivation process for calculating internal forces and displacements under circumferential non-axisymmetric loading.The curved beam configuration matches the horizontal geometry of diaphragm walls,enabling simultaneous consideration of spatial arching effects and simplified solution of three-dimensional structural problems while clarifying parameter-deformation relationships.Numerical validation through two case studies confirms theoretical derivations,with cloud distribution plots illustrating circumferential and vertical load-sharing coefficients.Results demonstrate that circumferential stiffness predominantly governs soil-water load resistance in circular diaphragm walls.
作者
金国龙
李鸿桥
谢雄耀
JIN Guo-long;LI Hong-qiao;XIE Xiong-yao(College of Civil Engineering,Tongji University,Shanghai 200092,China;China Shipbuilding NDRI Engineering Co.,Ltd.,Shanghai 200090,China)
出处
《岩土力学》
北大核心
2025年第S1期81-91,共11页
Rock and Soil Mechanics
基金
国家自然科学基金重点项目(No.52038008)
中海石油气电集团有限责任公司课题(No.CGP2022YFCB004)
关键词
圆形基坑
分载法
弹性地基曲梁
竖向地基曲梁
circular foundation pit
load-sharing method
curved beam with elastic foundation
vertical foundation curved beams
