长江科学院院报 ›› 2016, Vol. 33 ›› Issue (8): 114-119.DOI: 10.11988/ckyyb.20150486

• 岩土工程 • 上一篇    下一篇

库水位间歇性下降对堆积体滑坡稳定性的影响

肖志勇,邓华锋,李建林,胡安龙,李春波,常德龙   

  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:2015-06-09 修回日期:2015-07-16 出版日期:2016-07-25 发布日期:2016-07-25
  • 通讯作者: 邓华锋(1979-),男,湖北宜昌人,副教授,博士,主要从事岩土工程方面的教学与研究工作,(电话)13872585190(电子信箱)dhf8010@ctgu.edu.cn。
  • 作者简介:肖志勇(1989-),男,湖北襄阳人,硕士研究生,主要研究地质灾害机理分析与防护设计,(电话)15871610016(电子信箱)i_bound@163.com。
  • 基金资助:
    国家自然科学基金项目(51309141);水利部公益性行业科研专项(201401029);三峡大学研究生科研创新基金项目(2014CX016)

Influence of Intermittent Drawdown of Reservoir Water Level on the Stability of Accumulation Landslide

XIAO Zhi-yong, DENG Hua-feng, LI Jian-lin, HU An-long, LI Chun-bo, CHANG De-long   

  1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area China Three Gorges University),Ministry of Education,Yichang 443002,China
  • Received:2015-06-09 Revised:2015-07-16 Online:2016-07-25 Published:2016-07-25

摘要: 针对库水位快速下降不利于滑坡稳定的现状,提出库水位以间歇性方式下降,即在传统库水位持续性下降分析的基础上,以三峡库区某一堆积体滑坡为例,利用Geo-Studio软件详细分析了在库水位不同间歇时间和多阶段间歇下降条件下堆积体滑坡稳定情况。结果表明库水位实行间歇性下降,间歇时间有助于滑坡体内孔隙水压力消散,减小库水快速下降引起的地下水回落的滞后性,有利于水力梯度降低;相比库水位持续性下降,滑坡稳定性得到提高,但稳定系数与间歇时间并不呈正比例关系;在库水位实行多阶段间歇性下降后,提高的程度明显增大,达到5%以上。为了使滑坡稳定性提高的效果达到最佳,应合理地安排库水位下降和间歇时间。

关键词: 库水位间歇性下降, 堆积体滑坡, 孔隙水压力, 水力梯度, 滑坡稳定性, Geo-Studio, 稳定系数

Abstract: Rapid drawdown of reservoir water level is adverse to landslide stability. In view of this, we propose that the reservoir water level declines intermittently. On the basis of traditional analysis of persistent drawdown of water level, we analyzed the influences of intermission and intermittent drawdown of water level on the stability of landslide by using Geo-Studio software. An accumulation landslide in Three Gorges reservoir area was taken as an example. Research results show that intermission is in favor of the dissipation of pore water pressure in the landslide; meanwhile, lag effect of groundwater level’s decrease caused by rapid drawdown of reservoir weakens and hydraulic gradient decreases; when we compare reservoir intermittent drawdown with reservoir persistent drawdown, landslide stability factor of the former is bigger, but stability factor is not in proportion with intermission; under the multistage intermittent drawdown of reservoir, stability factor has obviously improved,which is greater than 5%. Finally, in order to optimize the landslide’s stability, we should reasonably arrange reservoir drawdown and intermittent time.

Key words: intermittent drawdown of reservoir water level, accumulation landslide, pore water pressure, hydraulic gradient, landslide stability, Geo-Studio, stability factor

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