长江科学院院报 ›› 2018, Vol. 35 ›› Issue (1): 112-116.DOI: 10.11988/ckyyb.20160959

• 岩土工程 • 上一篇    下一篇

考虑劣化效应的三峡库区某岸坡抗震性能分析

王晨玺杰, 邓华锋, 张恒宾, 方景成, 肖瑶   

  1. 三峡大学 三峡库区地质灾害教育部重点实验室,湖北 宜昌 443002
  • 收稿日期:2016-09-18 出版日期:2018-01-01 发布日期:2018-01-11
  • 通讯作者: 邓华锋(1979-),男,湖北宜都人,教授,博士,主要从事岩土工程方面的教学与研究工作。E-mail:dhf8010@ctgu.edu.cn
  • 作者简介:王晨玺杰(1992-),男,湖北神农架人,硕士研究生,主要从事岩土工程方面的研究工作。E-mail:350043768@qq.com
  • 基金资助:
    国家自然科学基金项目(51679127);国家自然科学基金重点项目(51439003);湖北省自然科学基金重点项目(2015CFA140);水利部公益性行业科研专项经费项目(201401029)

Seismic Behavior of a Typical Bank Slope of Three Gorges Reservoir inConsideration of Degradation of Rock Mass Mechanical Properties

WANG Chen-xi-jie, DENG Hua-feng, ZHANG Heng-bin, FANG Jing-cheng, XIAO Yao   

  1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry of Education,China Three Gorges University, Yichang 443002, China
  • Received:2016-09-18 Online:2018-01-01 Published:2018-01-11

摘要: 三峡库区蓄水之后,在库水位大幅度升降变化、降雨、高频中低强度地震等因素作用下,库岸边坡岩土体物理力学特性不可避免地存在逐渐劣化的趋势,这将直接影响库岸边坡的变形稳定。基于此,以三峡库区某库岸边坡为研究对象,考虑岩土体抗剪强度参数的劣化效应,对其抗震性能进行了分析评价。结果表明:对于该库岸边坡,①在各特征水位情况下,随着库水位的上升,岸坡的整体安全系数略有增加,随着地震加速度的增加,岸坡安全系数降低趋势明显;②在各级地震作用下,考虑岩土体抗剪强度参数劣化效应之后,岸坡的抗震能力逐渐降低,岸坡堆积体中下部可能出现局部失稳破坏,随着库水位的上升,岸坡不稳定区域的后缘逐渐上升。研究思路和成果可为库岸边坡长期稳定性评价和加固提供较好的参考。

关键词: 三峡库区, 库岸边坡, 水库地震, 参数劣化, 抗震性能

Abstract: After water impoundment in the Three Gorges Reservoir, the physical and mechanical properties of bank slope rock mass have inevitablely deteriorated under the influence of many factors such as dramatic water level fluctuation, rainfall, and low strength earthquake of high frequency, which directly affects the deformation stability of reservoir bank slope. In view of this, we analyzed and assessed the seismic behavior of a typical reservoir bank slope of Three Gorges Reservoir in consideration of the degradation of rock mass shear strength parameters. Results show that for the studied bank slope, 1) under different characteristic water levels, the global safety factor of slope increased slightly as water level raised, but reduced apparently as earthquake acceleration increased; 2) at all levels of earthquake action, the anti-seismic capacity of bank slope gradually reduced in the presence of degradation of shear strength parameters, with possible local instability in the mid-lower part of slope accumulation body; and as water level raised, the trailing edge of unstable region gradually raised. The research ideas and achievements offer reference for the stability evaluation and reinforcement of reservoir bank slope.

Key words: Three Gorges Reservoir, reservoir bank slope, reservoir earthquake, degradation of parameters, seismic behavior

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