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PDF(678 KB)
公路路基地基承载特性及破坏模式
Bearing Capacity Behaviors and Failure Modes of Foundati on underHighway Subgrade
基于公路路基基底的柔性和荷载分布为梯形的主要特征，采用了关联流动的Mohr-Coulomb内切圆屈服准则，通过增量加载的弹塑性有限元方法，着重研究了公路路基地基的承载特性和破坏模式，并与刚性条形基础地基进行了对比分析。研究结果表明，在相同的基底平均应力作用下，公路路基基底中心点相对沉降s/B比刚性条形基础大；公路路基地基的破坏模式主要与内摩擦角和弹性模量有关；明确了公路路基地基塑性变形多从地基中部向坡脚和外侧延伸；提出了公路路基地基承载力特征值的确定方法和修正系数k的值域范围。
The flexible interface and trapezoidal load are the main features of f oundation under highway subgrade . The bearing capacity behavior and failure modes off oundation under highw ay subgrade are studied and compared with those of rigid strip foundation , The Mohr- Coulombin side- tangentcircle yield crititerion under associated flow rule and elastic- plastic finite element method are adopted . It is revealed that the relative settlement o f central point of foundation under highway subgrade S /B is bigger than that off oundation under rigid strip load ; the failure modes of foundation under high way subgrade are mainly in fluenced by friction angle and elastic modules ; t he plastic form ati on mainly occurred at t he middle of foundation and extended to t he toe of slope ; the determination met hod of t he characteristic value of bearing capacit y foundation and the value range of modified coefficient are proposed .
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highway subgrade / bearing capacity of foundation / failure modes / step increment method / shea r failure / modified coefficient {{custom_keyword}} /
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