高速铁路软土路基沉降的因素敏感性分析

Factors sensitivity analysis of soft soil roadbed settlement of high-speed railway

运用弹塑性有限元法,分析各影响因素与路基沉降的相关关系,计算各因素的敏感度,找出影响路基沉降的主要因素.由计算和分析可知,在影响路基沉降的诸因素中,管桩长度的敏感度最大,软土层厚度次之,软土的内摩擦角敏感度最小.在软土各岩土体参数中,弹性模量和粘聚力对路基沉降的影响也比较大.在软土层比较厚、弹性模量和粘聚力均比较小时,路基的沉降比较大.在软土路基的加固措施中,增大管桩长度,对控制路基沉降的效果比较好;而增大筏板厚度,对控制路基沉降的效果则不明显.

Based on elastic-plastic finite element method,the relationship between the main influencing factors and roadbed settlement has been analyzed,and the influencing factor sensitivity of roadbed settlement has been studied.Among all of the main influencing factors of roadbed settlement,the sensitivity of the pipe pile length is the most important factor,and the sensitivity of soft soil layer thickness is the second important factor test,and the sensitivity of the soft soil internal friction angle is the smallest.In the soft soil parameters,the influencing of elastic modulus and cohesion on the roadbed settlement is obvious.It is revealed that the thicker the soft soil layer is,the more the roadbed settlement is,and the less the elastic modulus and cohesion is,the more the roadbed settlement is.In reinforced measures of soft soil roadbed,increasing the pipe pile length is effective to control the roadbed settlement,and the effect of increasing raft thickness is not obvious.