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在抗滑桩等的设计中,桩上土反力分布的确定是最关键的,但这个问题一直没有被很好地解决。桩上的真实土反力由法向土反力、环向摩阻力及轴向摩阻力3部分组成。通过对刚性桩与土体的相互作用进行有限元分析,研究了不同载荷水平下,土反力各分量在环向和轴向上的分布规律。研究发现随着载荷的增大,桩周土是由上到下渐进屈服的。同时研究了法向土反力和环向摩阻力对平均水平土反力的贡献,发现环向摩阻力与法向土反力相比,对总水平土反力的贡献虽然小,但不能忽略。而且法向土反力和环向摩阻力与平均水平土反力的比率与轴向位置和载荷水平有关。
In the design of anti-slide piles, the determination of the soil reaction force distribution on the pile is the most crucial, but this problem has not been solved well. The real soil reaction on the pile is composed of three parts: normal soil reaction force, circumferential friction resistance and axial friction resistance. Through the finite element analysis of the interaction between rigid pile and soil, the distribution of soil reaction force in the circumferential direction and axial direction under different load levels is studied. It is found that as the load increases, the soil around the pile gradually yields from top to bottom. At the same time, the contributions of both the normal earth resistance and the circumferential friction resistance to the average horizontal soil reaction force were studied. It was found that the contribution of the circumferential friction resistance to the total horizontal soil reaction force is small compared with the normal soil reaction force, but it can not be neglected . Moreover, the ratio of normal soil reaction force and circumferential friction resistance to the average horizontal soil reaction force is related to the axial position and load level.