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现有的地基承载力安全系数其缺点在于不能体现土体的三维受力状态,广义强度安全系数采用π平面上广义剪应力与强度包络线的比值可以更好的考虑土体的三维受力情形,因而能更好的体现地基承载力的安全特性。为了研究SD效应即土在三轴压缩与三轴拉伸强度不等对地基承载力安全系数的影响,本文首先基于广义非线性强度准则研究了表征SD效应大小R及准则参数α的关系,将R划分成三种情况。然后运用变换应力空间方法描述了基于广义非线性强度准则下的广义强度安全系数的表达式。算例结果表明,SD效应参数R对于地基承载力安全系数影响较大。
The existing safety factor of bearing capacity of foundation has the disadvantage that the three-dimensional force state of soil can not be represented. The generalized strength safety factor adopts the ratio of generalized shear stress and strength envelope on π plane to better consider the three-dimensional force of soil Situation, which can better reflect the safety of foundation bearing capacity. In order to study the effect of SD on the safety factor of bearing capacity of foundation under the condition of triaxial compression and triaxial tensile strength, the paper first studies the relationship between the size of SD effect and the criterion parameter α based on generalized nonlinear strength criterion. R is divided into three cases. Then, using the method of transformed stress space, the expression of generalized strength safety factor based on generalized nonlinear strength criterion is described. The numerical results show that the SD effect parameter R has a great influence on the safety factor of foundation bearing capacity.