梅雨气候区膨胀土填芯路基设计研究  

Design of Expansive Soil Filled Core Subgrade in Meiyu Climate Zone

作　　者：邓茜 刘晓爽 杨文迪 马超[1] DENG Xi;LIU Xiaoshuang;YANG Wendi;MA Chao(Key Laboratory of the Ministry of Education for Road and Railway Engineering Safety Assurance,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;China Railway 16th Bureau Group Tieyun Engineering Co.Ltd.,Guangzhou 510540,China)

机构地区：[1]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [2]中铁十六局集团铁运工程有限公司,广东广州510540

出　　处：《石家庄铁道大学学报（自然科学版）》2024年第2期106-112,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：集团公司科技研究开发计划(K2021-26C)。

摘　　要：将膨胀土作为路基填料,可有效利用膨胀土路堑开挖产生的弃土。以铜陵江北港铁路专用线膨胀土路基工程为依托,提出了梅雨气候区膨胀土填芯路基的设计方法。首先,进行膨胀土的膨胀力试验;然后,研究梅雨季节膨胀土填芯路基内部体积含水量与包边黏性土种类、包边厚度、路基压实系数的关系,分析梅雨季节填芯膨胀土膨胀力发育情况;最后,确定了膨胀土填芯路基设计方案,并将膨胀力引入折线型滑动面安全系数计算公式进行稳定性验算。结果表明,铜陵江北港铁路专用线膨胀土填芯路基采用亚黏土包边,包边厚度取1 m,压实系数取0.92,不仅能减少浪费,安全系数也满足规范要求。Using expansive soil as the filling material for subgrade can effectively utilize the abandoned soil generated from excavation of expansive soil ditches.Based on the engineering of expansive soil subgrade for Tongling Jiangbei Port Railway Special Line,a design method for expansive soil filled core subgrade in Meiyu climate zone was proposed.Firstly,the swelling force test of expansive soil was conducted.Then,the relationship between the internal volumetric water content of expansive soil filled core subgrade in Meiyu season and the type of surrounding cohesive soil,the thickness of surrounding soil layer and the compaction coefficient of subgrade was studied,and the development of swelling force of filled core expansive soil in Meiyu season was analyzed.Finally,the design scheme for expansive soil filled core subgrade was determined,and the swelling force was introduced into the formula for calculating the safety factor of the broken-line sliding surface stability.The results show that using mild clay as the surrounding soil with a thickness of 1 m and a compaction coefficient of 0.92 for the expansive soil filled core subgrade of Tongling Jiangbei Port Railway Special Line not only reduces waste,but also meets the requirements of the specification.

关 键 词：膨胀土填芯路基 梅雨气候区 膨胀力 体积含水量 

分 类 号：U213.1[交通运输工程—道路与铁道工程]