摘要
为了研究挡土墙后土体滑裂面的形状并计算土压力,建立了挡土墙后黏性填土滑动楔体达到极限平衡状态时的静力平衡方程.采用变分学方法求解滑裂面曲线方程和主动土压力的计算公式,得到土体滑裂面曲线为一对数螺旋线.将主动土压力计算值与库仑主动土压力、工程实测值分析对比.结果表明,计算所得的主动土压力值比广义库仑理论的计算值大5.37%,且与工程实测值较为接近.最后分析了挡土墙及墙后填土各参数对曲面滑裂面下的主动土压力值的影响,可知填土的黏聚力和内摩擦角是影响土压力值的关键参数.
In order to determine the sliding surface torm of the soil backfill and calculate the earth pressure, static equilibrium equations of sliding wedge were built for cohesive soil backfill by limit equilibrium method. Then, the equation of the sliding surface and the analytical expression for the total active earth pressure were derived using the variational method. As a general result, a log-spiral sliding surface was obtained. The calculated active earth pressure values were compared with those obtained by Coulomb theory and the measured data in an engineering example. The result shows that the active earth pressure calculated by the proposed method is 5.37% larger than that calculated by Cuulomb theory, and is close to the measured value. Finally, the effects on the active earth pressure of the retaining wall and the various parameters of the soil backfill with curved sliding surface were analyzed, revealing that the cohesion and internal friction angle of the soil backfill are the key faelors determining the value of active earth pressure.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2011年第5期732-738,共7页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(50879077)
关键词
挡土墙
主动土压力
曲面滑裂面
主动土压力系数
retaining wall
active earth pressure
curved sliding surface
coefficient of active earth pressure
