公路路基地基承载特性及破坏模式  

Bearing Capacity Behaviors and Failure Modes of Foundation under Highway Subgrade

作　　者：刘怡林[1,2,3] 黄茂松[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]交通部公路科学研究院,北京100088 [3]交通部道路结构与材料交通行业重点实验室,北京100088

出　　处：《地下空间与工程学报》2010年第1期84-89,共6页Chinese Journal of Underground Space and Engineering

基　　金：西部交通建设科技项目(No.200431822311;No.200831822357)

摘　　要：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Mo-hr-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 foundation under highway subgrade. The beating capacity behavior and failure modes of foundation under highway subgrade are studied and compared with those of rigid strip foundation, The Mohr - Coulomb inside - tangent circle yield criterion under associated flow rule and elastic - plastic finite element method are adopted. It is revealed that the relative settlement of central point of foundation under highway subgrade S/B is bigger than that of foundation under rigid strip load; the failure modes of foundation under highway subgrade are mainly influenced by friction angle and elastic modules ; the plastic formation mainly occurred at the middle of foundation and extended to the toe of slope ; the determination method of the characteristic value of bearing capacity foundation and the value range of modified coefficient are proposed.

关 键 词：公路路基 地基承载力 破坏模式 增量加载 剪切破坏 修正系数 

分 类 号：TU475[建筑科学—结构工程]