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冰川冻土 ›› 2015, Vol. 37 ›› Issue (5): 1268-1274.doi: 10.7522/j.isnn.1000-0240.2015.0140

• 寒区科学与技术 • 上一篇    下一篇

高原寒区冻融作用对水利工程基岩边坡稳定性影响分析

周志东1 2, 刘武3   

  1. 1. 武警水电三总队, 四川 成都 610036;
    2. 中国科学院 寒区与旱区环境与工程研究所, 甘肃 兰州 730000;
    3. 武汉大学 水利水电学院, 湖北 武汉 430072
  • 收稿日期:2015-05-08 修回日期:2015-07-19 出版日期:2015-10-25 发布日期:2016-03-28
  • 作者简介:周志东(1969-),湖南新化人,1998年于成都理工大学获得工学博士学位,主要从事水利水电施工、应急救援等技术与研究工作.E-mail:463525748@qq.com.
  • 基金资助:
    中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室开放基金"寒冻作用对西藏水电工程岩质边坡稳定性影响与综合治理"(SKLFSE201205)项目资助

Analysis of the influences of freezing-thawing action on rock slope stability of water conservancy engineering in high cold areas

ZHOU Zhidong1 2, LIU Wu3   

  1. 1. The Third General Hydroelectric Troop, Armed Police Force, Chengdu 610036, China;
    2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. Institute of Water Conservancy and Hydropower, Wuhan University, Wuhan 430072, China
  • Received:2015-05-08 Revised:2015-07-19 Online:2015-10-25 Published:2016-03-28

摘要: 西藏属于青藏高原的主体部分,该区域具有气候寒冷、温差大、太阳辐射强等特征,因而在海拔4000 m以上的地区冻融作用特别突出,并对工程边坡造成一定的影响.在已有的试验参数的基础上,采用有限差分法,以西藏某水利枢纽工程泄洪洞进水口边坡为例,计算分析了冻融作用对不同工况下边坡稳定性的影响.通过计算分析得到,冻融作用会导致边坡安全稳定系数有微小的下降,变化虽然不大,但是由于西藏高寒地区临界稳定边坡多,冻融作用导致边坡变形破坏的可能性较大,从而给工程造成损失和危害.因此,在施工过程中应该采取必要的措施,采用防冻融的材料,及时锚喷封闭边坡,防止大量降水或者地下水的侵入,有效减小冻融作用的影响是十分必要的.

关键词: 冻融作用, 西藏, 边坡, 稳定性, 影响

Abstract: The Tibet Autonomous Region is located in the main part of the Tibetan Plateau, where the climate is cold with large temperature difference, strong solar radiation and so on. In the region, freezing-thawing action is especially prominent above 4000 m altitude and causes a certain influence on the slopes. In this paper, on the basis of experiment, the finite difference method is adopted; a key water conservancy project intake slope of spillway tunnel is taken as an example to analyze the influences of freezing and thawing on the stability of the slope under different conditions by calculation. Through calculation and analysis, it is found that there is a tiny decrease in stability coefficient of slope safety caused by freezing-thawing action. Although it is a little change, but because there are many critical stable slopes in the region, freezing-thawing action increases the possibility of slope deformation and damage and causes loss and damage to the project slopes. Therefore, in the construction process the necessary measures should be taken. It is very necessary to use anti freezing-thawing materials. Side slopes should be timely anchored and closed in order to prevent a large number of intrusive rain water or groundwater and effectively reducing the effects of freezing-thawing action.

Key words: freezing-thawing action, Tibet Autonomous Region, slopes, stability, effect

中图分类号: 

  • TD824.7+1