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当前螺旋桩的竖向荷载设计理论系统性不足,不能满足工程实际要求。本文通过对粘土地基螺旋桩承载力计算方法进行探讨分析,根据螺旋桩竖向承压特性,使用极限平衡理论和梅耶霍夫承载力理论,进一步完善了承压螺旋桩的破坏机理,得到修正的单叶片和多叶片竖向承压螺旋桩的极限承载力计算公式。通过比对,螺旋桩基础极限承载力计算值与承压试验结果拟合较好,说明本文提出的螺旋桩基础承压破坏模式比较接近实际破坏情况,得到的粘土地基条件下相应极限承载力计算公式,可初步用于对承压螺旋桩极限承载力的估算。为其他土质条件下确定螺旋桩承载力计算公式提供了借鉴和参考。
The theoretical design of the vertical load of the current screw pile is not systematic enough to meet the actual requirements of the project. Based on the analysis of vertical bearing capacity of screw pile, limit equilibrium theory and Meyerhoff’s bearing capacity theory, the failure mechanism of pressure screw pile is further improved and the corrected Calculation formulas of ultimate bearing capacity of single - blade and multi - blade vertical compression screw pile. By comparing, the calculated value of the ultimate bearing capacity of the screw pile foundation fits well with the result of the pressure test, which shows that the compression failure mode of the screw pile foundation proposed in this paper is relatively close to the actual failure condition, and the corresponding ultimate bearing capacity The formula can be used initially to estimate the ultimate bearing capacity of pressure screw pile. It provides reference and reference for determining the bearing capacity formula of spiral pile under other soil conditions.