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Energy analysis of geosynthetic-reinforced slope in unsaturated soils subjected to steady flow

稳定渗流作用下加筋土加固非饱和土边坡能量分析

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Abstract

Soils are actually unsaturated in nature. In the present study, a stability analysis of a geosynthetic-reinforced slope in unsaturated soils subjected to various steady flow conditions is conducted based on limit analysis. Work rate by apparent cohesion due to matric suction is calculated based on the effective stress-based equation. Analytical expression of the required cohesion/stability number of slope is derived from the energy balance equation. An optimization code is programmed to capture the optimized solution of the stability number. Comparison is made to verify the present work and a parametric analysis is conducted to investigate the effects of soil type, infilitration rate, reinforcement strength and soil suction on slope stability afterwards. A set of numerical solutions is presented at the end of the paper for preliminary design purposes.

摘要

实际状态下的土体一般是非饱和的。基于极限分析理论, 本文开展了稳定渗流作用下加筋土加 固非饱和土边坡的稳定性分析。借助有效应力法对基质吸力引起的表观黏聚力功率进行了计算, 从边 坡稳定的能量平衡方程中推导出了维持边坡稳定的所需黏聚力和稳定性系数, 并编制了最优化程序来 捕捉稳定性系数最优解。文章进行对比分析以验证本文所采用方法的有效性, 其后采用参数响应分析 的手段以探讨土体类型、渗流速率、加固强度以及土体基质吸力对边坡稳定性的影响。为方便初步设 计使用, 文章最后给出了一系列的稳定性系数最优解。

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Authors and Affiliations

  1. College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, 100124, China

    Jing-shu Xu  (许敬叔) & Xiu-li Du  (杜修力)

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  1. Jing-shu Xu  (许敬叔)
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  2. Xiu-li Du  (杜修力)
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Correspondence to Xiu-li Du  (杜修力).

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Foundation item

Project(2019M650011) supported by China Postdoctoral Science Foundation; Project(51421005) supported by the Science Fund for Creative Research Groups of the National Natural Science Foundation of China; Project(2015CB057902) supported by the National Basic Research Program of China

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Xu, Js., Du, Xl. Energy analysis of geosynthetic-reinforced slope in unsaturated soils subjected to steady flow. J. Cent. South Univ. 26, 1769–1779 (2019). https://doi.org/10.1007/s11771-019-4132-5

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  • DOI: https://doi.org/10.1007/s11771-019-4132-5

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