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<p>Current research on the progressive failure mechanisms and dynamic load transfer paths induced by localized failure in asymmetrical excavation support systems re-mains insufficient. This study, based on the “component removal method,” designs a model test for local failure of internal supports in an asymmetrically excavated foundation pit. Through refined three-dimensional numerical modeling, multi-condition comparative validation is conducted, revealing the coordinated evolution mechanism of deformation and internal force response following local support failure. Key findings demonstrate: post-failure reduction in lateral stiffness of supporting slabs induces inward dis-placements, amplifying surrounding soil settlement, with significantly greater dis-placement increments observed in deeper excavation zones compared to shallower regions; Axial force redistribution follows a proximity amplification and distal attenuation pattern, with adjacent struts experiencing force increases to 1.48 times after single strut failure, while distant struts show reductions to 0.93 times; Bending moments increase in remote support structures due to soil arching effects, reaching up to 427 N·m on the shallow side, whereas near-field structures exhibit moment reductions attributed to pronounced unloading effects from significant slab displacement; The secondary retaining wall exhibits cantilever-like behavior, with bending moments rising to 450 N·m post-failure.</p>

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Progressive failure mechanisms and dynamic load redistribution in asymmetric excavation with partial bracing collapse

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月27日

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  • Jixin Chong,
  • Fengbin Su,
  • Huanwei Wei,
  • Xiao Zheng,
  • Fuyuan Liu

摘要

Current research on the progressive failure mechanisms and dynamic load transfer paths induced by localized failure in asymmetrical excavation support systems re-mains insufficient. This study, based on the “component removal method,” designs a model test for local failure of internal supports in an asymmetrically excavated foundation pit. Through refined three-dimensional numerical modeling, multi-condition comparative validation is conducted, revealing the coordinated evolution mechanism of deformation and internal force response following local support failure. Key findings demonstrate: post-failure reduction in lateral stiffness of supporting slabs induces inward dis-placements, amplifying surrounding soil settlement, with significantly greater dis-placement increments observed in deeper excavation zones compared to shallower regions; Axial force redistribution follows a proximity amplification and distal attenuation pattern, with adjacent struts experiencing force increases to 1.48 times after single strut failure, while distant struts show reductions to 0.93 times; Bending moments increase in remote support structures due to soil arching effects, reaching up to 427 N·m on the shallow side, whereas near-field structures exhibit moment reductions attributed to pronounced unloading effects from significant slab displacement; The secondary retaining wall exhibits cantilever-like behavior, with bending moments rising to 450 N·m post-failure.