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在人工开挖的斜坡上施工满足合理桩间距的两根悬臂式抗滑桩,通过对模型槽内填土的顶面进行堆载,研究了桩前施工挡土板时挡土板水平变形和桩–板土压力比的变化规律。待位移传感器和土压力计读数稳定后,采用自上而下摘板的措施模拟桩前土开挖的施工过程。通过分析不同高度上测点x方向土压力的分布规律,探讨了桩间土沿高度方向直接土拱与摩擦土拱的作用程度及作用范围。摘板过程结束后,对桩间土的局部滑塌面进行测量,通过与三维土拱效应的作用范围进行比较,证实了合理桩间距条件下桩间土产生局部滑塌的范围总是处于直接土拱的拱圈内侧区域。采用自制的简易静力贯入设备对拱脚剪切线附近的原状土进行测定,基于实测锤尖贯入曲线,分析了桩间不同高度上拱脚的极限剪切作用厚度。
Two cantilever anti-slide piles that satisfy the reasonable pile spacing are constructed on the manually excavated slopes. By stacking the top surface of the fill soil in the model slot, the horizontal deformation and Variation law of pile - soil pressure ratio. After the displacement sensor and earth pressure gauge are stable, the top-down pick-off measures are used to simulate the construction of the soil before excavation. By analyzing the distribution of earth pressure in the x-direction at different heights, the effect and the scope of direct soil arching and friction soil arching along the height direction between piles are discussed. After the pick-off process is finished, the local slump surface of the soil between the piles is measured and compared with the scope of the three-dimensional soil arching effect, it is confirmed that the scope of local slump of the soil between piles is always direct Arch soil inside the arch area. The self-made simple static penetrating equipment was used to measure undisturbed soil near the shear line of the arch foot. Based on the measured penetrating curve, the thickness of the ultimate shear of the arch foot at different heights was analyzed.