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已有模型实验及现场实测表明,刚性挡墙随着变位模式和位移量的变化,主动土压力合力和分布均发生改变,有时甚至与经典理论的线性分布有很大不同。采用中间状态系数定义非极限状态,提出了砂土中刚性挡墙不同主动位移模式下非极限状态土压力合力系数的计算公式;将墙后土体简化为连续非线性弹簧和刚塑性体的组合体作用在挡墙上,得到了不同位移模式任意位移的土压力分布和合力作用点高度。与已有理论方法和实验结果对比表明,该文方法在三种典型位移模式下与实验数据吻合更好。研究还发现,平动模式土压力呈线性分布,其合力随挡墙位移量的增大易趋于稳定并到达极限状态;绕墙底和绕墙顶转动模式下土压力合力随着位移增大只能接近极限状态且呈非线性分布。绕底转动时,土压力分布曲线逐渐向上凹,合力作用点高度趋于降低;绕顶转动时,分布曲线则逐渐向上凸,合力作用点高度趋于升高,墙顶附近表现出明显的土拱效应。
The existing model experiments and field measurements show that with the change of displacement mode and displacement, the resultant force and distribution of active earth pressure change, sometimes even with the linear distribution of classical theory. Using the intermediate state coefficient to define the non-limit state, a formula for calculating the earth pressure coefficient of non-limit state under different active displacement modes of sand wall in sand is proposed. The soil behind the wall is simplified as the combination of continuous nonlinear spring and rigid plastic body The body acts on the retaining wall and obtains the earth pressure distribution with arbitrary displacement in different displacement modes and the height of the resultant force. The comparison with the existing theoretical and experimental results shows that the proposed method is in good agreement with the experimental data in three typical displacement modes. The study also found that the earth pressure in the translational mode is linearly distributed, and its resultant force tends to be stable and reaches the limit state with the increase of the displacement of the retaining wall. The resultant of the earth pressure force increases with the increase of the displacement around the wall and around the wall, Only close to the limit state and non-linear distribution. The curve of soil pressure gradually concave upward, and the height of the point of resultant force tends to decrease when it turns around the bottom. When the top of the circle is rotated, the distribution curve gradually rises upward, and the height of the point of resultant force tends to increase, showing obvious soil Arch effect.