路基排水沟施工开挖的变形特性研究  

Deformation Characteristics Study on Excavation of Roadbed Drainage Ditch Construction

作　　者：李元飞 邢浩 吴佳润 Li Yuanfei;Xing Hao;Wu Jiarun(Yunan Infrastructure Investment Co.,Ltd.,Kunming,China;The Fourth Engineering Co.,Ltd.,China Railway Seventh Group,Wuhan,China;School of Civil Engineering,Central South University,Changsha,China)

机构地区：[1]云南建设基础设施投资股份有限公司,云南昆明 [2]中铁七局集团第四工程有限公司,湖北武汉 [3]中南大学土木工程学院,湖南长沙

出　　处：《科学技术创新》2024年第10期102-105,共4页Scientific and Technological Innovation

摘　　要：本文基于勐绿高速公路路基工程,运用PFC2D离散元软件进行了路基排水沟开挖的数值模拟。通过选取不同路段土体根据物理力学参数构建土体颗粒模型,分别记录和分析了不同形状排水沟开挖后的变形情况。结果表明:矩形和梯形排水沟基底的土体颗粒竖向位移均最大,施工时需夯实基底土;矩形排水沟模型竖向位移呈“U”形,存在潜在破坏面,梯形排水沟模型竖向位移呈环形,不存在潜在破坏面,排水沟建议设计为梯形,施工时及时进行混凝土浇筑,减少边坡的破坏。This study employs the PFC2D discrete element software to conduct a numerical simulation of roadbed drainage ditch excavation based on the roadbed engineering of Menglu Expressway.By constructing soil particle models according to physical and mechanical parameters of different soil sections,the deformation of drainage ditches with various shapes after excavation was recorded and analyzed.The findings reveal that the largest vertical displacement of soil particles at the base occurs in rectangular and trapezoidal drainage ditches,necessitating compaction of the foundation soil during construction.The vertical displacement of the rectangular drainage ditch model assumes a“U”shape with potential failure surfaces,whereas that of the trapezoidal drainage ditch model assumes a circular shape without potential failure surfaces.Therefore,it is recommended that the design of drainage ditches be in trapezoidal shapes,and timely concrete pouring should be carried out during construction to minimize slope damage.

关 键 词：排水沟 数值模拟 变形 施工开挖 

分 类 号：U415[交通运输工程—道路与铁道工程]