基于 Meyerhof理论的临坡地基极限承载力简化分析方法∗

摘要

针对现有临坡地基承载力研究方法中采用竖向均布作用力代替基础埋深影响而不能充分考虑埋深内土体抗剪强度贡献的问题，引入 Meyerhof 理论。首先，基于临坡条形基础地基的工程特点，通过研究其破坏机理，构建出考虑临坡条形基础埋深内土体抗剪强度作用的单侧滑移破坏模式。然后，在此破坏模式研究基础上，基于 Meyerhof 理论求解基础埋深内土体抗剪强度影响作用的思路，通过引入刚体极限平衡分析方法，导出了能够反映临坡条形基础埋深内土体抗剪强度作用、基础距坡顶距离、基础两侧埋置深度不同以及基础两侧侧壁与土体摩擦作用影响的临坡条形基础地基极限承载力简化计算公式，较已有研究成果计算方法更简便，更具工程适用性。最后，通过工程实例计算分析并与现有研究分析方法对比分析，表明了本研究方法的可行性与合理性。%In the existing research methods for determining the ultimate bearing capacity of foundation near Slope,the vertical uniform force instead of embedded depth of foundation was adopted,which did not consider the contribution of the soil shear strength in depth enough.In view of the problems,the Meyer-hof Theory was introduced.First of all,based on the engineering characteristics of strip footing,the fail-ure mechanism of strip footing near slope was thoroughly analyzed.Meanwhile,the new unilateral sliding failure mode considering the soil shear strength in the strip footing embedded depth of foundation adj acent to slope was established for further in-depth study of the method for determining the bearing capacity of strip footing near slope.Then,on the basis of the failure mode,the ultimate bearing capacity analysis model of strip footing adj acent to slope was derived in the rigid body limit equilibrium analysis method, based on the Meyerhof theory to solve the impact of the soil shear strength in depth.The method reflects not only the soil shear strength in depth,the distance effect from the top of the slope,different embedment depth on both sides of the footing,but also the friction effect between the wall of strip footing and the soil in depth.The simplified calculation formula is simpler and engineering applicative,compared with the ex-isting research results.Finally,the feasibility and rationality of the proposed approach were shown through an engineering example calculation and comparison with current research results.