黄土结构性对挡土墙土压力的影响分析

天然黄土一般具有结构性,结构性的存在使得土体在力学和变形特性等方面呈现出不同的变化规律。基于对黄土结构性的研究和真三轴试验,利用改制的平面应变仪,对黄土在平面应变条件下的应力应变规律及其结构性的影响进行了研究分析。提出了平面应变条件下结构性对黄土力学和变形特性影响的适用表达式。土压力计算是挡土墙设计中重要考虑的问题,将结构性引入其计算中,更加真实合理地反映墙体的受力状态。研究结果表明:在考虑土体的结构性影响时,墙后的主动土压力和墙底的被动土压力相比于不考虑时都有明显不同的变化。表现为总主动土压力变大,作用点下移;总被动土压力变小,作用点上移。

Impact of Loess Structural Properties on Earth Pressure of Retaining Wall

The natural loess has structural properties. The deformation and mechanical properties of soil show a different performance because of its structural properties. Based on the structural research of loess and triaxial test, this paper studied the regularity of stress-strain of loess and the impact of loess structural properties with the reconstructed plane-strain apparatus in the condition of plane strain, and puts forward the applied formula which can reflect the deformation and mechanical properties. The calculation of earth pressure is one of the important problems in the retaining wall design. Considering the structural properties, the result can reflect the real stress state of retaining wall. Studies indicate that the active earth pressure of the wall and the passive earth pressure of the bottom wall have obvious different changes compared with that when they were not considered. The total active earth pressure becomes larger and its acting point moves downward, while the total passive earth pressure becomes smaller and its acting point moves up.