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应用水平条分法与极限平衡原理讨论了抗拔桩在分层地基中的极限承载力、破裂面、土体性质的关系。将破裂面看成是由若干段组合而成的复合破裂面,并沿各段将边坡水平条分为多块体。在假设边坡岩土体服从摩尔-库仑屈服准则条件下,根据极限平衡原理,建立抗拔桩极限承载力的多元函数,利用数学优化方法给出其最优解,从而可以方便地给出抗拔桩破裂面及对应的极限抗拔力。通过算例分析并与前人研究成果比较,其结果表明:该理论方法是合理有效的,可以用于预测抗拔桩地基承载力极其破裂面形状。
The relationship between ultimate bearing capacity, rupture plane and soil properties of uplift piles in stratified subsoil is discussed by using the principle of horizontal bar and limit equilibrium. The rupture surface is regarded as a composite rupture surface formed by a combination of several sections, and the horizontal section of the slope is divided into a plurality of blocks along each section. Based on the principle of limit equilibrium, a multivariate function of ultimate bearing capacity of uplift piles is established under the assumption that the slope rock and soil mass obeys the Mohr-Coulomb yield criterion, and the optimal solution is given by mathematical optimization so that the resistance can be conveniently given Pulling pile rupture surface and the corresponding ultimate pull-out force. The results show that this method is reasonable and effective, which can be used to predict the ultimate bearing capacity of pile foundation.