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<p>Buttress walls are widely used to limit wall displacement and protect adjacent buildings, but their role in enhancing excavation stability has not been extensively investigated. This study performed a three-dimensional finite element analysis with reduced shear strength to evaluate buttress wall performance for basal-heave stability in soft clays, considering both elastic and elastoplastic structural behaviors. Results show that friction along the contact surface between the buttress wall and surrounding soil is critical for resisting basal heave, and increasing the butress&#xa0;wall length, depth, or number enlarges this frictional area, improving the factor of safety (FS). With elastoplastic behavior, failure starts with retaining-wall yielding and then soil failure; under elastic behavior, it arises from soil failure that causes&#xa0;significant upward soil movement&#xa0;inside excavation and induces large soil movement beneath and behind the walls. New simplified methods were developed to estimate FS for excavations with buttress walls under elastic and elastoplastic behaviors and were validated by finite element results and case histories. Several case studies also confirm the ability of simplified method to assess basal-heave risk and provide buttress-wall dimensioning to meet required FS.</p>

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Numerical assessment of basal heave stability for deep excavation with buttress wall in soft clays

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Ari Surya Abdi,
  • Chang-Yu Ou

摘要

Buttress walls are widely used to limit wall displacement and protect adjacent buildings, but their role in enhancing excavation stability has not been extensively investigated. This study performed a three-dimensional finite element analysis with reduced shear strength to evaluate buttress wall performance for basal-heave stability in soft clays, considering both elastic and elastoplastic structural behaviors. Results show that friction along the contact surface between the buttress wall and surrounding soil is critical for resisting basal heave, and increasing the butress wall length, depth, or number enlarges this frictional area, improving the factor of safety (FS). With elastoplastic behavior, failure starts with retaining-wall yielding and then soil failure; under elastic behavior, it arises from soil failure that causes significant upward soil movement inside excavation and induces large soil movement beneath and behind the walls. New simplified methods were developed to estimate FS for excavations with buttress walls under elastic and elastoplastic behaviors and were validated by finite element results and case histories. Several case studies also confirm the ability of simplified method to assess basal-heave risk and provide buttress-wall dimensioning to meet required FS.