无挡板悬臂式抗滑桩桩间土体稳定性上限分析

桩间土体的稳定性是无挡板悬臂式抗滑桩设计时需要考虑的问题。通过总结模型试验现象,建立悬臂式抗滑桩桩间土体失稳空间滑动面模型。利用极限分析上限法获得已知桩间净距时桩间土体临空面极限高度。结合土体强度折减法推导出桩间土体稳定性系数计算方法。通过以上两种方法可以估计桩间土体失稳范围和土体滑塌量。将计算得到桩间土体临空面极限高度和桩间土体稳定性系数与试验结果进行对比,验证计算方法的正确性。采用单一变量法分析了桩间土体临空面高度h、临空面宽度w、土体内摩擦角φ、土体黏聚力c对桩间土体稳定性的影响。

Upper bound limit analysis of stability of soils between unbaffled cantilever anti-slide piles

The stability of the soils between unbaffled cantilever anti-slide piles should be considered during design. Based on model test results, a three-dimensional sliding surface model for the soils between cantilever anti-slide piles is established. The upper bound limit analysis method is used to obtain the maximum height of free face of the soils. The strength reduction method is combined with the upper bound limit analysis method to calculate the stability coefficient of the soils between piles. Both methods can be used to estimate the instability area and the volume of slumped soils. The maximum height of free face of the soils and the stability coefficient of the soils between piles calculated by the proposed method are compared with the experimental results, and the correctness of the proposed method is verified. Using the single variable method, the effects of the free face height h, free face width w, internal friction angle φ and cohesion c on the stability of the soils between piles are analyzed.