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Journal of Central South University

, Volume 26, Issue 7, pp 1755–1768 | Cite as

Kinematic analysis of geosynthetics-reinforced steep slopes with curved sloping surfaces and under earthquake regions

  • Jian-feng Zhou (周建烽)
  • Chang-bing Qin (覃长兵)Email author
  • Qiu-jing Pan (潘秋景)
  • Cheng-yang Wang (王成洋)
Article
  • 14 Downloads

Abstract

A procedure of kinematic analysis is presented in this study to assess the reinforcement force of geosynthetics required under seismic loadings, particularly for steep slopes which are hardly able to maintain its stability. Note that curved sloping surfaces widely exist in natural slopes, but existing literatures were mainly focusing on a planar surface in theoretical derivation, due to complicated calculations. Moreover, the non-uniform soil properties cannot be accounted for in conventional upper bound analysis. Pseudo-dynamic approach is used to represent horizontal and vertical accelerations which vary with time and space. In an effort to resolve the above problems, the discretization technique is developed to generate a discretized failure mechanism, decomposing the whole failure block into various components. An elementary analysis permits calculations of rates of work done by external and internal forces. Finally, the upper bound solution of the required reinforcement force is formulated based on the work rate-based balance equation. A parametric study is carried out to give insights on the implication of influential factors on the performance of geosynthetic-reinforced steep slopes.

Key words

earthquakes pseudo-dynamic approach discretization-based kinematic analysis geosynthetics steep slopes 

土工网加固的曲线型陡坡在地震区的机动性分析

摘要

本文采用机动分析法评估了陡坡在地震条件下维持其稳定所需土工网加固力。由于涉及复杂计 算, 已有文献在理论推导中主要考虑平面型边坡。而针对自然边坡中广泛存在着的曲线型边坡, 尤其 是地震作用下曲线型非均质边坡, 传统的上限分析法难以考虑其稳定性。为了解决上述问题, 本文首 先采用离散技术生成一个离散的破坏机制, 即将整个破坏块体分解成不同的组成部分, 然后通过单元 分析来计算土工网加固力及地震荷载等外部荷载所做功率和内能耗散, 其中采用拟动力法来表示随时 间和空间变化的横向和纵向加速度。最后, 通过功率平衡方程获得土工网加固力上限解, 并阐释了各 因素对土工网加固陡坡性能的影响。

关键词

地震 拟动力法 基于离散法的机动分析 土工网 陡坡 

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Copyright information

© Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Civil EngineeringHuaqiao UniversityXiamenChina
  2. 2.Department of Civil & Environmental EngineeringNational University of SingaporeSingaporeSingapore
  3. 3.School of Civil EngineeringCentral South UniversityChangshaChina

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