土石混填路堤稳定性的模型试验研究  

Model Test and Research on Stability of Soil-rock Embankment

作　　者：王志强 马丽娜[1,2] 王起才[1,2] 李岳超 张江峰[1] 肖锐 WANG Zhi-qiang;MA Li-na;WANG Qi-cai;LI Yue-chao;ZHANG Jiang-feng;XIAO Rui(School of Cvil Engineering,Lanzhou Jinotong Universiy,Lanzhou 730070,China;Ntional and Local Joint Enginccring Laboralory of Rond and Bridge Engineering Dxsaster Prevention and Control Technology,Lanzhou Jinotong University,Lanazhou 730070,China;Gansu Transporlation Planning Survey and Design Institute Co.Ltd.,Lanzhou 730000,China)

机构地区：[1]兰州交通大学土木工程学院,兰州市730070 [2]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州市730070 [3]甘肃省交通规划勘察设计院股份有限公司,兰州市730000

出　　处：《公路》2022年第7期55-63,共9页Highway

基　　金：长江学者和创新团队发展计划滚动支持项目,项目编号IRT-15R29;陇原青年创新人才(团队)项目,项目编号201812;甘肃省教育厅产业支撑计划项目,项目编号2021CYZC-28。

摘　　要：采用甘肃省甘南藏族自治州王夏高速公路现场某标段的土石混合料在室内基于相似比理论制作了土石混填路堤模型,并在多级加载条件下进行了路堤模型稳定性试验,对土石混填路堤在竖向荷载作用下的受力变形规律、土压力分布特征以及受力破坏形式进行研究。试验结果表明:(1)土石混填路堤模型整体稳固性、结构性强,在静载作用下极限承载能力可达到600 kPa;(2)由于土石混填路堤承压板两侧的边界约束强度不一致,在静载作用下位于承压板对称两侧的路堤会出现明显的竖向应力扩散和受力变形不对称的特征,且不对称性程度与路堤深度有关;(3)土石混填路堤达到极限承载能力破坏时路堤内部有滑动体产生,滑动破坏面形状比较接近数学上的双曲螺旋曲面而非传统的土质路基的圆弧滑动面。In the paper, by using the soil-rock mixture that taken from a contract section of the Wangchangcun-Xiazhuang Expressway in Gannan Tibetan Autonomous Prefecture of Gansu Province, a soil-rock embankment model is made indoors based on the similarity ratio theory, and the embankment model stability test is carried out under multi-level loading conditions. The force and deformation law, the distribution characteristics of earth pressure and the force failure form of the embankment filled with soil and rock under the action of vertical load are studied. The test results show that:(1) the overall stability and structure of the soil-rock embankment model is strong, and the ultimate bearing capacity can reach 600 kPa under static load;(2) the boundary constraint strength on both sides of the soil-rock embankment bearing plate is inconsistent.Under static load,the embankment located on the symmetrical sides of the bearing plate will have obvious vertical stress spreading and asymmetrical force deformation,and the degree of asymmetry is related to the depth of the embankment;and (3) the embankment is filled with soil and rock. When the ultimate bearing capacity is destroyed,there are sliding bodies inside the embankment,and the shape of the sliding failure surface is closer to the mathematical hyperbolic spiral surface instead of the traditional arc sliding surface of the soil subgrade.

关 键 词：道路工程 土石混填路堤 相似比理论 多级加载 滑动破坏体 

分 类 号：U416.1[交通运输工程—道路与铁道工程]