基于修正抗滑桩模型的地震边坡稳定性研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (24) : 14-23.

论文

基于修正抗滑桩模型的地震边坡稳定性研究

贾志波1，陶连金2，潘菁2，任育杰2，邱明洋2，刘建功2，邓力嘉2

作者信息 +

Study of seismic slope stability based on modified stabilizing piles model

JIA Zhibo1，TAO Lianjin2，PAN Jing2，REN Yujie2，QIU Mingyang2，LIU Jiangong2，DENG Lijia2

Author information +

文章历史 +

摘要

在边坡稳定性分析中，抗滑桩常被简化为弹性或弹塑性结构，不能考虑桩身的剪断和折断。为研究抗滑桩失效引起的连锁效应，本文基于Fish语言构建了修正模块，通过在现有模型基础上增加失效段模拟桩的断裂。同时，基于汶川地震调查，归纳了抗滑桩破坏类型，确定了断裂判定指标。新模型被用于边坡的动力响应规律探究，从最大剪力、加速度、频谱和位移多个方面对比不同模型间的差异。此外，文章在断裂框架下进一步探讨了三维边坡抗滑桩间的变形协调规律。结果表明：1）通过构建和调用修正模块可以实现抗滑桩的断裂效果。修正后的模型表现为两个阶段，在初始阶段结构抗滑力随边坡的滑动而增大。当达到极限状态后，阻滑作用消失。2）抗滑桩失效对边坡的影响首先体现在加速度的突变，同时伴随更高的频率和更大的残余位移。3）三维边坡的抗滑桩间具有显著的变形协调关系，其表现为不同的断裂顺序。忽略抗滑桩间的相互作用可能导致边坡失稳风险被低估。

Abstract

Application ofSstabilizing piles is the main reinforcement measure of the slope. In research, stabilizing piles are often simplified to elastic or elastic-plastic structuresoften use elastic or elastoplastic models, which do not reflect the failure caused by shear forces and bending moments. To study the instability mechanism of the stabilized pile slope, a correction module based was established, which simulated the fracture by adding the failure stage. Based on the Wenchuan earthquake investigation, the selection principle of failure criterion iwas analyzed. The new model is was applied to the dynamic response analysis. The influence of pile failure on the slope is was explored from the indexes of maximum shear force, acceleration, spectrum, and displacement. Besides, the deformation coordination relationship between piles in the three-dimensional slope is was discussed under the fracture frame. The results show that: 1) the fracture effect can be achieved by constructing and calling the correction module. The modified model has two stages. Once the internal force reaches the limit value, the anti-sliding effect of the pile disappears. The failure will cause a sudden change of acceleration, higher frequency, and greater residual displacement. 3) The fracture sequence is the reflection of the relationship between the stabilizing piles. The neglect of pile interaction may lead to the underestimation of landslide risk

导出引用

贾志波1, 陶连金2, 潘菁2, 任育杰2, 邱明洋2, 刘建功2, 邓力嘉2. 基于修正抗滑桩模型的地震边坡稳定性研究[J]. 振动与冲击, 2024, 43(24): 14-23

JIA Zhibo1, TAO Lianjin2, PAN Jing2, REN Yujie2, QIU Mingyang2, LIU Jiangong2, DENG Lijia2. Study of seismic slope stability based on modified stabilizing piles model[J]. Journal of Vibration and Shock, 2024, 43(24): 14-23

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