高速公路改良风化砂-红黏土路基填料永久变形试验研究  

Experimental Study on Permanent Deformation of Improved Weathered Sand-Red Clay Fill Material in Highway Subgrade

作　　者：林永胜 LIN Yongsheng(China Merchants Chongqing Communications Technology Research&Design Institute Co.,Ltd.,Chongqing 400067)

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《公路交通技术》2023年第4期1-6,共6页Technology of Highway and Transport

摘　　要：为提高风化砂-红黏土地区路基在车辆荷载作用下的稳定性和耐久性,研究了掺砂比、初始干密度和循环荷载对改良风化砂-红黏土永久变形行为的综合效应,并通过室内三轴永久变形试验分析了这些因素对变形特性的影响。试验结果表明:1)在初始干密度一定的情况下,随掺砂比的增加,永久变形终值先减小后增大,在掺砂比为10%时达到最小值;2)在一定掺砂比下,随初始干密度的增大,最终永久变形终值也增大;3)当掺砂比和初始干密度一定时,土体的永久变形值与循环荷载次数呈对数关系。在此试验结果基础上,建立了综合考虑掺砂比、初始干密度和循环荷载效应的改良风化砂-红粘土永久变形预测模型,并对其进行了鲁棒性验证。鲁棒性验证结果表明,所建模型具有较高的准确性与适用性,可应用于路基工程路基填料永久变形量的预测。In order to improve the stability and durability of subgrade in weathered sand-red clay area under vehicle load,the comprehensive effects of sand ratio,initial dry density and cyclic load on the permanent deformation behavior of improved weathered sand-red clay were studied,and the effects of these factors on the deformation characteristics were analyzed by indoor triaxial permanent deformation test.The test results show that when the initial dry density is constant,the permanent deformation decreases first and then increases with the increase of sand ratio,and reaches the minimum value when the sand ratio is 10%.Under a certain sand mixing ratio,with the increase of initial dry density,the final permanent deformation value also increases.When the sand mixing ratio and the initial dry density are constant,the permanent deformation value of the soil is logarithmically related to the number of cyclic loads.Based on the test results,a permanent deformation prediction model of modified weathered sand-red clay considering sand ratio,initial dry density and cyclic load effect was established,and its robustness was verified.The robustness verification results show that the model has high accuracy and applicability,and it can be applied to the prediction of permanent deformation of subgrade filling in subgrade engineering.

关 键 词：道路工程 改良风化砂-红黏土 掺砂比 永久变形 预估模型 

分 类 号：U416.1[交通运输工程—道路与铁道工程]