摘要
超高填方涵洞在山区公路建设中日益增多,其上部荷载很大,对涵洞地基承载力提出了更高的要求。现阶段涵洞地基设计多采用规范法,这对涵洞安全和造价均有很大影响。本文运用FLAC3D对某超高填方拱涵进行数值模拟,分析了井字形地连墙法对超高填方涵洞沉降和土压力的影响,并对换填槽深度、宽度,增强体沿涵洞纵向轴线间距,地基处理范围及换填材料性质进行参数分析。结果表明,采用井字形地连墙法处理后,涵洞基础沉降明显减小,涵顶土压力略有增加。加大换填槽宽度、深度;减小轴线间距;提高换填材料模量都能有效减小基底沉降。增大地基处理范围,可同时减小基底沉降和涵顶土压力。
There is an increasing number of high fill culverts used in construction of expressway in mountainous regions. The high fill culverts often work under large overlying loads, it means higher requirements on the bearing capacity of the foundation. At present, the design of foundation are often made in accordance with the code, which brings higher project cost. The influence of grid-shaped diaphragm wall method on settlement and earth pressure of high fill culverts is studied by the numerical simulation. After that, the influencing factors （ such as the trench depth and width, the spacing of the reinforcement diaphragm along the culvert longitudinal axis, the range of ground treatment, the fill material properties） are systemically discussed. The results show that the foundation settlement of the culvert is largely reduced, while the earth pressure above the culvert increases after the grid-shaped diaphragm wall method is taken; the earth pressure can be reduced by increasing the trench depth and width, narrowing axial spacing, strengthening modulus of fill material in trench; expanding the range of ground treatment can reduce both foundation settlement and the earth pressure.
出处
《土木工程与管理学报》
2013年第2期41-45,共5页
Journal of Civil Engineering and Management
基金
山西省交通建设科技项目(11-2-17)
关键词
高填方涵洞
地基处理
井字形地连墙
数值模拟
high fill culvert
ground treatment
grid-shaped diaphragm wall
numerical simulation
