黄土路基刚-柔性长短桩复合地基设计参数正交数值试验研究  

Orthogonal Numerical Test Study on Design Parameters of Rigid-Flexible Long-Short Pile Composite Foundations in Loess Subgrade

作　　者：王文芳 杲斐 陈云峰 程选生[2] WANG Wenfang;GAO Fei;CHEN Yunfeng;CHENG Xuansheng(School of Civil Engineering,Lanzhou Petrochemical University of Vocational Technology,Lanzhou Gansu 730060,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou Gansu 730050,China;Scientific and Technological Innovation and Digitization Department,China Railway 21st Bureau Group Corporation Ltd.,Lanzhou Gansu 730070,China;Track Maintenance Department,China Railway Lanzhou Group Co.,Ltd.,Lanzhou Gansu 730000,China)

机构地区：[1]兰州石化职业技术大学土木工程学院,甘肃兰州730060 [2]兰州理工大学土木工程学院,甘肃兰州730050 [3]中铁二十一局集团有限公司科技创新与数字化部,甘肃兰州730070 [4]中国铁路兰州局集团有限公司工务部,甘肃兰州730000

出　　处：《中国铁路》2025年第1期67-75,共9页China Railway

基　　金：甘肃省自然科学基金计划项目(22JR5RA805);甘肃省建设科技计划项目(JK2019-47)。

摘　　要：为探究黄土地区刚-柔性长短桩(RFLSP)复合地基设计参数对路基沉降的影响,结合兰州—张掖三四线铁路工程,设计了多参数的RFLSP复合地基正交数值试验,研究了不同褥垫层结构、长短比、桩间距和短桩模量对路基总沉降的影响。结果表明,复合地基参数对路基总沉降的影响因素依次为长短比、桩间距、短桩模量和褥垫层结构,其对应的极差值为11.89、6.94、5.53和2.95;当柔性短桩长度不变、刚性长桩的桩长增大时,路基总沉降在减小;路基总沉降随桩间距的增加先增大后近似不变,随柔性短桩模量的增加而减小,土工格栅层数对路基总沉降影响较小;复合地基设计时,根据柔性短桩的挤土效果确定桩间距,优先通过调整刚性长桩的长度和柔性短桩的模量调节路基总沉降。Based on the Lanzhou-Zhangye Third and Fourth Line Railway Project,a multi-parameter orthogonal numerical test was designed to investigate the influence of design parameters of rigid-flexible long-short pile(RFLSP)composite foundations on subgrade settlement in loess areas.This test aimed to analyze how various factors—including cushion structures,long-short pile ratios,pile spacing,and the modulus of short piles—affect total subgrade settlement.The results revealed the following order of influence for the composite foundation parameters on total subgrade settlement:long-short pile ratio,pile spacing,modulus of short piles,and cushion structure,with their respective range values being 11.89,6.94,5.53,and 2.95.When the length of the flexible short piles remains constant,the increasing length of the rigid long piles leads to a decrease in the total subgrade settlement.The total subgrade settlement initially increases with greater pile spacing before stabilizing at a roughly constant level.Additionally,an increase in the modulus of the flexible short piles results in a decrease in total subgrade settlement.The number of geogrid layers has minimal impact on the total subgrade settlement.Therefore,during the design of composite foundations,pile spacing should be determined based on the soil squeezing effect of the flexible short piles.The total subgrade settlement can be managed by preferentially adjusting the length of the rigid long piles and the modulus of the flexible short piles.

关 键 词：黄土路基 设计参数 正交数值试验 刚-柔性长短桩复合地基 极差分析 

分 类 号：TU435[建筑科学—岩土工程]