摘要
针对非饱和地基上的梯形路堤,提出其临界填筑高度计算的基本假定,进而考虑地基土的非饱和特性与实际侧压力系数,建立了均匀和线性2种吸力分布下地基临界荷载及路堤临界填筑高度的解析公式.所得解析公式具有很好的可比性,通过实例比较验证了解析公式的正确性及所给公式适用条件的必要性.参数分析结果表明:基质吸力及其分布、侧压力系数和吸力角对临界填筑高度的影响均很显著;忽略非饱和特性而按饱和土地基进行的路堤设计偏于保守,均布吸力较线性吸力的影响更明显;侧压力系数应选择以满足公式适用条件的真实值,吸力角的影响与基质吸力及其分布密切相关.
For the trapezoid embankment on unsaturated ground,some basic assumptions about the calculation of critical filling height were proposed.Then,with consideration of unsaturated characteristic of ground soils and actual lateral pressure coefficient,analytical formulae for both critical load of foundation and critical filling height of embankment were presented under uniform and linear distributions of matric suction.The obtained analytical formulae which had good comparability were validated by comparing with practical embankment,and also the necessity of given applicable conditions was highlighted.Parametric studies show that all the effects of matric suction and its distribution,lateral pressure coefficient and suction angle on the critical filling height are significant;the embankment design based on the saturated soil mechanics neglecting unsaturated characteristics of ground soils is conservative;the effect of uniform suction is more obvious than that of linear suction;a real lateral pressure coefficient shold be selected to meet the applicable conditions of analytical formulae,and the effect of suction angle is closely related to matric suction and its distribution.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第5期87-92,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(41202191)
陕西省自然科学基础研究计划资助项目(2015JM4146)
中国博士后科学基金资助项目(2014M562358)
陕西省博士后科研基金资助项目
关键词
路堤
填筑高度
非饱和特性
侧压力系数
基质吸力
embankment
filling height
unsaturated characteristic
lateral pressure coefficient
matric suction
