交通荷载下红层土石混填路基沉降特性研究  

On Settlement Characteristics of Red-bed Earth-rock Mixture Subgrade under Vehicle Loads

作　　者：高福洲 陈思远 张俊云[1] GAO Fuzhou;CHEN Siyuan;ZHANG Junyun(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 100000,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]中铁工程设计咨询集团有限公司,北京100000

出　　处：《路基工程》2023年第5期49-55,共7页Subgrade Engineering

基　　金：四川省科技计划重点项目(2021YFS0321);四川省交通运输科技项目(2021-A-02)。

摘　　要：红层土石混填路基已广泛应用于西南地区线路建设。为弄清交通动荷载幅值与频率、含石量及车速对路基沉降的影响,以马边至昭觉段公路工程中的红层路基填料作为研究对象,开展室内模型试验与数值模拟。研究表明:红层土石混填路基沉降与荷载幅值呈正相关,与荷载频率呈负相关;以6秒为节点可将路基最大沉降分为大幅变化阶段与动态稳定阶段;路基沉降随含石量增大而减小,路基含石量由32.5%提升至45.5%时,沉降减少36.0%;车速对路基沉降影响具有随机性。The red-bed earth-rock mixture subgrade has been widely used in road construction in Southwest China.in order to clarify the effects of traffic dynamic load amplitude and frequency,stone content,and vehicle speed on roadbed settlement,taking the red layer subgrade filling in the road project from Mabian to Zhaojue as the research object,indoor model tests and numerical simulations were conducted.The research showed that there is a positive correlation between the settlement of the red-bed earth-rock mixture subgrade and the amplitude of the load,and there is a negative correlation between the settlement of the red-bed earth-rock mixture subgrade and the load frequency.The maximum settlement of the subgrade can be divided into significant change stage and dynamic stability stage by taking 6 seconds as a time interval.The settlement of the subgrade decreased with the increase of stone content.The settlement decreased by 36.0%when the stone content of the subgrade increased from 32.5%to 45.5%.The impact of vehicle speed on subgrade settlement was random.

关 键 词：红层土石 混填路基 沉降特性 模型试验 数值模拟 含石量 交通动荷载幅值 交通动荷载频率 车速 

分 类 号：TU411[建筑科学—岩土工程]