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水泥土桩是软土边坡常用的一种较经济的加固结构,但目前对水泥土桩加固边坡的变形破坏特性和抗滑机制认识不清,相应的稳定性评价理论研究较少。建立了一边坡模型,运用有限元分析了离散水泥土桩加固边坡的变形破坏特性,结果发现边坡失稳时,桩-土之间由于变形不协调而产生塑性滑移,强度和刚度都较大的水泥土桩呈S型挠曲变形而发生弯折破坏,未能有效发挥设计要求的抗滑能力,加固边坡最后形成贯通的剪切滑动带而非滑动面。提出了水泥土剪力墙的概念,通过有限元模拟发现,采用水泥土剪力墙加固边坡,因墙-土界面摩擦力的作用,下滑力在剪力墙和边坡滑体之间得到调整,最终促使加固边坡产生整体剪切破坏,有效发挥了剪力墙的抗滑能力。通过桩土复合结构的水平推剪模型试验,验证了数值模拟结果的合理性。
Cement-soil piles are commonly used as a more economical reinforcement structure for soft soil slopes. However, the understanding of the deformation and failure mechanisms and the anti-slide mechanism of cement-soil piles strengthened slopes is not clear at present, and the corresponding theoretical studies on stability evaluation are few. A slope model was established. The deformation and failure characteristics of the slope reinforced by discrete cement-soil piles were analyzed by finite element method. It was found that when the slope is unstable, the plastic-slip between the pile-soil due to the uncoordinated deformation and the strength and stiffness The larger cement-soil pile is bent and deformed by S-shaped deflection, which fails to effectively exert the anti-skidding ability required by the design. Finally, a reinforced shearing slope is formed instead of a sliding surface. The concept of cement-soil shear wall is proposed. Finite element simulation shows that the use of cement-soil shear wall to reinforce the slope, the sliding force between the shear wall and the slope due to the friction between the wall and soil Adjustment, and ultimately promote the reinforcement of the whole slope shear damage, effectively exert the skid resistant ability of the shear wall. Through the horizontal push-pull model test of pile-soil composite structure, the rationality of the numerical simulation results is verified.