Stability analysis method for the composite foundation embankment based on pile shear strength
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摘要: 根据瑞典条分法和简化毕肖普法分析边坡稳定性原理，通过对抗滑桩及桩间土的稳定力矩与滑动力距进行单独分析及计算，提出基于桩体强度的路堤边坡稳定性分析桩-土分算法。采用桩-土分算法和规范法对具有不同加固桩桩径、桩间距和路堤高度的边坡稳定性及滑坡破坏特点进行分析。结果表明，桩-土分算瑞典条分法计算所得稳定系数最大，桩-土分算毕肖普法次之，规范法所得稳定系数最小。基于3种方法的路堤边坡稳定系数均随坡高增大而降低，规范法与桩-土分算法计算所得稳定系数差值，随边坡高度增大呈先增大后减小的抛物线形变化。此外，桩-土分算法分析所得边坡最不利滑面位置出现了“下移”现象，根据规范法边坡最不利圆弧滑面穿过地基加固区中部，但当路堤边坡高度为9~15 m时，桩-土分算法分析所得最不利圆弧滑面绕开了柔性桩加固区域，位于柔性桩加固区底部以下区域，且此时边坡仍然存在不稳定性。Abstract: In the current specification, the stability analysis of the embankment slope is calculated by combining the strength parameters of the two parts of pile and the soil into a single parameter, which will cause the slope stability and the position of the most unfavorable slip surface to deviate from the actual project. Therefore, by using the Swedish strip method and the simplified Bishop method to analyze the slope stability principle, through the separate analysis and calculation of the stability moment and sliding force distance of the anti-slide pile and the soil between the piles, a pile-soil algorithm for embankment slope stability analysis is proposed. The pile-soil division algorithm and the code method are used to analyze the stability and landslide failure characteristics of slopes with different reinforcement pile diameters, pile spacing and embankment heights. The results show that the pile-soil calculation has the largest stability coefficient calculated by the Swedish strip method, followed by the pile-soil calculation Bishop method, and the standard method has the smallest stability coefficient. The embankment slope stability coefficients based on the three methods all decrease as the slope height increases. The difference between the stability coefficients calculated by the standard method and the pile-soil algorithm shows a parabolic change that increases first and then decreases as the slope height increases. The difference between the two pile-soil separation algorithms is approximately linear. In addition, the position of the most unfavorable sliding surface of the slope obtained by the analysis of the pile-soil analysis algorithm shows a “downward” phenomenon. With the code method, the most unfavorable arc sliding surface of the slope passes through the middle of the foundation reinforcement area. However, when the height of the embankment slope is 9~15 m, the pile-soil algorithm analysis indicates that the most unfavorable arc slip surface passes the flexible pile reinforcement area and is located below the bottom of the flexible pile reinforcement area, and the slope is not yet stable.
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