Effect of Excess Pore Pressure on Earthquake‐Induced Displacement of Partially Saturated Sandy Soil Slopes: Flexible Sliding Block Analysis

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-10-10 DOI:10.1002/nag.3855
Tong Zhang, Jian Ji, Shigui Du, Jian Song, Wengui Huang
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Abstract

The permanent displacement of earth slopes during earthquake shaking is a key indicator for landslide hazard assessment. Previous studies mostly attempt to evaluate the earthquake‐induced displacement of dry or saturated soil slopes, while it is less common to deal with partially saturated soils. In the present study, a simplified procedure is proposed to account for the seismic‐induced excess pore pressure in slopes with partially saturated sandy soils. The effect of matric suction, suction stress, and excess pore pressure on the yield acceleration of partially saturated sandy slopes is investigated, and the coupled Newmark sliding block method, known as the flexible soil columns with dynamic shear modulus and damping ratio, is modified to estimate the seismic slope displacement. Detailed discussions are made about the effect of different degrees of saturation on the excess pore pressure ratio, yield acceleration, and slope displacement. The numerical results show that the excess pore pressure ratio tends to exponentially increase with saturation, and the change of yield acceleration and displacement with saturation can be divided into suction stress dominant and excess pore water pressure dominant stages.
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过大孔隙压力对部分饱和砂土边坡地震诱发位移的影响:柔性滑动块分析
地震震动时土坡的永久位移是滑坡危险评估的一个关键指标。以往的研究大多试图评估干土或饱和土质边坡的地震诱发位移,而对于部分饱和土质边坡的地震诱发位移则较少涉及。本研究提出了一种简化程序,用于计算部分饱和砂土斜坡的地震诱发过剩孔隙压力。研究了母吸力、吸应力和过剩孔隙压力对部分饱和砂土边坡屈服加速度的影响,并修改了纽马克滑动块耦合法(即具有动剪切模量和阻尼比的柔性土柱),以估算地震边坡位移。详细讨论了不同饱和度对过剩孔隙压力比、屈服加速度和边坡位移的影响。数值结果表明,过剩孔隙压力比随饱和度呈指数增长趋势,屈服加速度和位移随饱和度的变化可分为吸应力主导阶段和过剩孔隙水压力主导阶段。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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