考虑破坏模式的水泥土桩承载力计算与研究

Calculation and Research on the Bearing Capacity of Cement Soil Pile Considering Failure Mode

根据现场试验桩体破坏模型,通过简化得到假定的滑动面,借助该滑动面上桩体和桩周土的极限平衡条件,推导出水泥土单桩极限承载力公式。以济南市绕城高速公路工程为例,用本文推导水泥土单桩承载力公式与传统承载力公式的计算结果与现场试验结果进行比较,研究结果表明:本文承载力公式考虑了桩的现场破坏模式、桩土的受力分析、桩周土对桩承载力提高作用等影响,经工程实例验证,其结果比较相符,具有一定实际意义。并通过计算分析可得:从单桩承载力角度上考虑水泥土桩存在有效桩长,水泥土桩承载力的关键在于浅层桩身强度。研究结论可为类似工程的设计施工提供借鉴。

Based on the site test of pile failure model,assumption of sliding surface is obtained by simplifying,with the aid of limit equilibrium condition of sliding surface of the pile body and the soil around the pile,the ultimate bearing capacity of cement soil pile is derived. Ji＇nan city ring expressway project is taken as an example,the calculation results of cement soil pile bearing capacity formula derived in this paper and the traditional bearing capacity formula are compared with field test results,the results show that： pile site failure mode,pile-soil force analysis,the soil around the pile bearing capacity enhance the role of impact are considered of the bearing capacity formula in this paper,the results are coincident proved by engineering example,having certain practical significance. Conclusion is acquired through calculation and analysis： soil cement pile has the effective pile length from the perspective of the bearing capacity of single pile,the key of cement soil pile bearing capacity lies in the shallow pile strength. The research conclusions can provide some references for such engineering design and construction.