条形抛物线荷载下桩网结构路基的附加应力计算

摘要

The strict control standards for post-construction settlement of high-speed railway require high accuracy of settlement calculation,and the improvement of settlement calculation precision directly results from the high computational accuracy of additional stress,which makes the issue of calculating additional stress of significant importance. Differing from the assumption that the load acting on soil between piles in geosynthetic reinforced pile supported embankment presents uniform or symmetrical triangular distribution in the present study,the parabolic distribution form is proposed. Starting with the distribution function of strip parabolic load acting on soil between piles,the computational formula of additional stress caused by strip parabolic load in elastic foundation is put forward. The theoretical derivation is proved to be correct and reliable by numerical simulation;and the rationality and superiority of the computing method of additional stress are guaranteed by case study. The research achievements can provide reference for improving computational accuracy of additional stress along with settlement in geosynthetic reinforced pile supported embankment.%高速铁路严格的工后沉降控制标准对沉降计算的精度提出了高要求，沉降计算精度的提高很大程度上依赖于地基附加应力计算精度的提高，因此附加应力的计算问题尤为重要。针对桩网结构路基现有研究中对桩间土荷载均匀分布和对称三角形分布的假设，提出桩间土荷载呈抛物线形式分布的假定；从推导桩网结构路基桩间土条形抛物线荷载的分布函数着手，提出条形抛物线荷载下弹性地基的附加应力计算公式；通过数值模拟验证理论推导的正确性和可靠性，并结合工程实例分析验证所提的桩网结构路基附加应力计算方法的合理性和优越性。研究成果可为提高桩网结构路基的附加应力计算精度提供参考。