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针对圆形基坑底板突涌灾害与临界安全厚度问题，考虑土体自身强度参数影响，该文构造出了包含剪切区与被动区的底板突涌破坏力学模型，并采用Mohr-Coulomb强度准则与非线性强度准则，根据极限平衡原理，分别推导出底板抗突涌安全厚度计算公式。同时，分析得到了底板抗突涌安全厚度与土体不排水强度沿深度变化系数、黏聚力、被动区高度、土体强度参数呈负相关，与非线性系数m、承压水压力呈正相关。土体强度参数与被动区高度对底板抗突涌安全厚度影响较为显著。
Abstract：Focused on water inrush disaster and critical safety thickness of circular foundation pit bottom slab,a mechanical model of bottom slab inrush failure including shear zone and passive zone is constructed by considering the influence of the soil strength parameters. Then the Mohr-Coulomb strength criterion and nonlinear strength criterion are adopted,and the calculation formula of safety thickness of the bottom slab against water inrush is derived according to the principle of limit equilibrium. Meanwhile,the analysis shows that the safety thickness of bottom slab against water inrush is negatively correlated with the depth variation coefficient of the undrained strength of the soil,cohesion,passive zone height and soil strength parameters,and positively correlated with the nonlinear coefficient m and the confined water pressure. The soil strength parameters and the passive zone height will significantly affect the safety thickness of bottom slab against water inrush.
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基本信息:
DOI：
中图分类号:TU753
引用信息:
[1]李春林,罗国勇,刘荣秀,等.考虑地层强度影响的圆形基坑底板突涌破坏分析[J].勘察科学技术,2025,No.264(05):1-7+33.
基金信息:
国家自然科学基金项目(52374093); 中国博士后科学基金资助项目(2022M711314); 山东省自然科学基金(ZR2022ME088); 济南市科研带头人工作室项目(202333054)