Stability analysis of a high loess slope reinforced by the combination system of soil nails and stabilization piles
Stability analysis of a high loess slope reinforced by the combination system of soil nails and stabilization piles
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DOI：
10.1007/s11709-014-0260-z
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发表时间：
2014-07
影响因子：
3
通讯作者：
Jiujiang Wu;Q. Cheng;Xin Liang;Jian-lei Cao
中科院分区：
文献类型：
--
作者：
Jiujiang Wu;Q. Cheng;Xin Liang;Jian-lei Cao
土钉及其复合支护技术在深基坑和普通边坡支护中应用广泛，但在黄土高边坡支护中却鲜有相关工程实例。本文利用PLAXIS 8.5有限元软件，对某黄土高边坡土钉与稳定桩组合加固（以下简称CSNSP）的受力特性进行了研究。研究发现，在多阶段开挖过程中，边坡潜在滑动面向较深的位置移动。减轻坡顶重量的措施对黄土边坡的稳定性是一个积极的因素，而降雨是一个消极的因素。在多段开挖过程中，仅靠稳定桩或土钉加固边坡是无法实现边坡稳定的。当开挖深度较浅时，土钉对系统整体稳定性的贡献较大，而当开挖深度较大时，稳定桩则取而代之。与瑞典圆滑面结果相比，在边坡未加固或仅采用稳定桩加固时，采用phi/c折算法得到的数据较大，而采用土钉加固或土钉与稳定桩组合系统加固时，得到的数据较小。
While the soil nails and the corresponding compound technology are widely used as the support techniques for deep foundation pit and normal slopes, few related engineering cases are found for high loess slopes. By utilizing the finite element software of PLAXIS 8.5, the behavior of a high loess slope reinforced by the combination of soil nails and stabilization piles (hereinafter for CSNSP) is studied in this paper. It can be found that the potential slide surface of the slope moves to deeper locations during the process of the multi-staged excavations. The measure of reducing the weight of the top of the slope is a positive factor to the stability of the loess slope, while the rainfall is a negative factor. The slope can’t be stable if it’s reinforced only by stabilization piles or soil nails during the process of the multi-staged excavations. The soil nail contributes greater to the overall system stability when the excavation depth is relatively shallow, while the stabilization pile takes it over when the excavation depth reaches a large value. Compared to the results from the Sweden circular slip surface, the data derived from the method of phi/c reduction is relatively large when the slope is unreinforced or reinforced only by stabilization pile, and the data turns to be small when the slope is strengthened by soil nails or the combination system of soil nails and stabilization piles.