摘要
为了减小经典库仑土压力理论与实际工程中竖向分层土压力之间的误差,在传统库仑土压力理论和有限土压力理论的基础上,考虑了非饱和土的强度特性,建立了挡土墙后竖向分层填土的静力学平衡关系,得到了竖向分层填土的主动土压力的计算公式。通过与现有理论对比分析,验证了本文理论的正确性。分别分析了填土性质参数及挡土结构几何参数对土压力的影响规律。研究结果表明:竖向土层的不同对主动土压力计算结果影响较大,竖向分层非饱和填土主动土压力随有效黏聚力、有效内摩擦角和基质吸力的增大而减小,随墙背倾角及填土表面倾角的增大均呈增大趋势;靠近墙背侧填土抗剪强度指标变化对主动土压力的影响更明显。
In order to reduce the error between the classical Coulomb’s earth pressure theory and the vertical layered earth pressure in actual engineering, based on the traditional Coulomb’s earth pressure theory and finite earth pressure theory, and considering the strength characteristics of unsaturated soil, the static equilibrium relationship of layered soil behind the retaining wall was established. The calculation formula of the active earth pressure of the vertical layered soil was obtained. By comparing with the existed theories, the reasonableness of the method in this paper was explained. The influence law of the filling property parameters and the retaining structure geometric parameters on the earth pressure are respectively analyzed. The research results show that the difference of the vertical soil layer has a great influence on the calculation result of active earth pressure. The active earth pressure of vertical layered unsaturated soil decreases with the increase of effective cohesion, effective internal friction angle and matrix suction, and increases with the increase of the grading angle of back wall and the slope angle of backfill surface. The change of the shear strength indexes of the filling near the back wall has a more obvious influence on the active earth pressure.
作者
巨永前
夏琼
Ju Yongqian;Xia Qiong(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,P.R.China;National Demonstration Center for Experimental Civil Engineering Education,Lanzhou Jiaotong University,Lanzhou 730070,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2022年第1期75-82,共8页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(41662017)。
关键词
主动土压力
竖向分层
非饱和土
极限平衡理论
active earth pressure
vertical stratification
unsaturated soil
limit equilibrium theory
