Three-dimensional numerical modelling of discrete piles used to stabilize landslides
Three-dimensional numerical modelling of discrete piles used to stabilize landslides
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DOI：
10.1139/t11-046
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发表时间：
2011-09
影响因子：
3.6
通讯作者：
S. Kanagasabai;J. Smethurst;W. Powrie
中科院分区：
文献类型：
--
作者：
S. Kanagasabai;J. Smethurst;W. Powrie
通过三维有限差分分析，研究了通过嵌入稳定地层来稳定滑动土体的单桩的行为。最初进行的分析是为了确定靠近无侧限地面的极限桩土侧压力 pu 的减少量。然后分析探讨了 Viggiani 分类的滑坡稳定桩的破坏机制。然后研究了改变滑动和稳定地层之间的滑移面界面强度以及倾斜地表对桩性能的影响。正如 Viggiani 所假设的那样，具有刚性桩、明显的滑动平面和水平地面的数值模型的结果与他的理论解非常一致。与 Viggiani 的理论解决方案相比，靠近地面和邻近滑动面的较低 pu 值会降低桩可为滑动体提供的最大剪切阻力。进一步分析表明，滑移面界面的强度对桩的性能有相当大的影响，并且地表的坡度仅在一定角度以上才显着。
Three dimensional finite difference analyses have been carried out to investigate the behaviour of a single pile used to stabilise a slipping mass of soil, by embedment into a stable stratum. Analyses were initially carried out to determine the reduction in the limiting pile-soil lateral pressure, pu, close to the unconfined ground surface. The analyses then explore the failure mechanisms for landslide stabilising piles categorised by Viggiani. The effects of varying the strength of the slip plane interface between the sliding and stable strata, and of a sloping ground surface on the behaviour of the pile are then investigated. The results from numerical models with a rigid pile, a distinct plane of sliding and a horizontal ground surface, as assumed by Viggiani, agree closely with his theoretical solutions. Lower values of pu close to the ground surface and adjacent to the sliding plane are found to reduce the maximum shear resistance that piles can provide to the slipping mass, when compared with Viggiani’s theoretical solutions. The further analyses show that the strength of the slip plane interface has a considerable influence on pile behaviour, and that the slope of the ground surface is only significant above a certain angle.