摘要
在边坡上修建建筑物时,基础距坡顶的水平距离将直接影响到建筑物和边坡的稳定性,而目前缺乏合理确定基础距坡顶安全距离的方法。采用数值方法建立了不排水条件下黏性土坡上条形基础的计算模型,通过与经典文献中的计算结果对比验证了数值计算的可行性,然后通过数值计算得到的承载力系数变化趋势来确定安全距离。在大量数值分析的基础上,研究了土体强度、土体重度、基础宽度、边坡坡角等因素对于安全距离的影响。结果表明:土体的归一化抗剪强度对于边坡破坏模式以及基础的安全距离都有较大的影响;当边坡较陡尤其是抗剪强度较低时,基础距坡顶的安全距离明显增大;当坡高大于一定值后对于基础承载力系数的影响可忽略不计。通过结果整理,得到了不同情况下的安全距离的建议取值,为实际工程中确定建筑物在坡上的位置提供参考。
The horizontal distance between the foundation and the top of the slope directly affect the stability of the slope and buildings. However, the reasonable method determining the safety distance from the foundation to the top of the slope is in deficiency at present. In this study, numerical simulation method is applied to analyze the factors which influence the safety distance and make parameter study. First, numerical models of strip footing on slope of cohesive soil under undrained condition are established and the feasibility of numerical simulation is verified by comparison with the results in the classic literature. Afterwards, the safe distance is determined through the change trend of the bearing capacity coefficient obtained by numerical calculation. On the basis of large quantity of numerical computation, the influences of several factors such as soil shear strength, soil unit weight, footing width, slope angle on the safety distance are studied. The simulation results indicated that the normalized shear strength of soil has remarkable influence on the failure mode on the slope and the safety distance. The safety distance increases significantly on the case of steep slope angle especially when the soil shear strength is low. The height of slope has negligible effect on the bearing capacity of footing and slope stability when the slope is higher than a certain value. The relative safety distance in different conditions is obtained through sorting out the simulation results, which can provide a reliable reference for determining the position of the strip footing on the slope in the practical projects.
出处
《林业工程学报》
北大核心
2017年第1期130-134,共5页
Journal of Forestry Engineering
基金
国家自然科学基金青年项目(51508279)
关键词
黏性土坡
条形基础
安全距离
数值分析
cohesive soil slope
strip footing
safety distance
numerical analysis
