摘要
依据现场试验及数值模拟,研究高填方盖板涵及其周围填土的应力场分布特征。结果表明:涵顶各点土压力与填土自重近似线性相关,线性系数与盖板涵的宽高比呈单峰曲线关系,据此建立了涵顶中点压力经验公式,计算精度较规范法有较大的改进;涵洞顶部有应力集中效应,涵顶平面上的土压力呈M状分布,非均匀分布的范围约为1.5倍的涵顶宽度,涵洞对其上方1.5倍涵身高度内填土的土压力分布有影响,影响范围的剖面形状为倒梯形;依据涵洞两侧及上方填土体中的土压力分布特征提出了降低涵顶压力可采取的不等强压实的范围;盖板涵两侧墙上各点水平压力均小于静止土压力,据此设计盖板涵是偏于安全的。
Through field test and numerical simulation,the stress field distribution characteristics of high embankment slab-culvert and the surrounding soil are studied.The results show that the earth pressure at each point of the culvert is approximately linearly related to the self-weight of the filling soils over it,The linear coefficient is the unimodal curve with the width to height ratio of the slab-culvert,Based on this,an empirical formula for the midpoint pressure at the top of culvert is established,and compared with the standard method,the calculation accuracy is improved greatly.Under the influence of stress concentration at the top of culvert,the earth pressure on the plane of the culvert top presents M distribution,and the non-uniform distribution is about 1.5 times of the width of the culvert.The culvert has an effect on the distribution of soil pressure in the upper 1.5 times of the embankment’s height,and the profile shape of the affected area is inverted trapezoid.According to the distribution characteristics of earth pressure in the soil on both sides and above the culvert,the range of unequal compaction to reduce the pressure at the top of culvert is proposed.The horizontal pressure at each point on both sides of the slab-culvert is less than the static earth pressure,according to this design slab-culvert is biased to safety.
作者
李国维
米帅奇
仇红超
吴建涛
李军
吴桂胜
LI Guowei;MI Shuaiqi;QIU Hongchao;WU Jiantao;LI Jun;WU Guisheng(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210098,China;Highway and Railway Research Institute,Hohai University,Nanjing,Jiangsu 210098,China;CCCC Second Highway Consultants Co.,Ltd.,Wuhan,Hubei 430056,China;Guangdong Provincial Transportation Planning and Design Institute Group Co.,Ltd.,Guangzhou,Guangdong 510507,China;Kaiyang Expansion Management Office,Guangdong Freeway Co.,Ltd.,Guangzhou,Guangdong 529339,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2022年第11期2311-2319,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(42177126)。
关键词
路基工程
盖板涵
原位测试
数值模拟
应力分布
影响范围
subgrade engineering
slab-culvert
in-situ test
numerical simulation
pressure distribution
influence scope
