摘要
卡拉水电站大坝坝肩左岸为高陡的反倾向层状岩质高边坡,谷坡高度接近1 000m,边坡的稳定性直接关系到坝址的选取和工程造价。利用有限元强度折减法和刚体极限平衡法,对左岸坝肩边坡在天然状态下和开挖成型条件下多种工况的坡体稳定性进行了研究,并利用有限单元法对边坡可能的施工方案进行了敏感性分析,得出如下结论:①边坡天然状态下和开挖加固条件下开挖范围内坡体安全系数均大于1.0,但在暴雨工况下其坡顶开挖范围外的部分坡体安全系数为0.95,存在局部失稳的可能性;②拟采取的开挖加固方案能有效的减小开挖坡体范围内屈服区,但是对坡顶开挖范围外的坡体无太大影响。
The abutment of Kala Hydropower Project located in the middle of Yalongjiang River in Sichuan Province of China, is made of a high rock slope and the slope stability in the period of construction and operation is one of the key technical issues worried about by the designers. The slope stability is directly related to the dam location and project costs. The finite element method （FEM） and limit equilibrium theory （LET） are adopted to analyze the stability of the left bank slope before being excavated and dur-ing its construction period under several loading Conditions and the sensitivity analysis of different construction schemes, which will be carried out, is conducted. Some conclusions are drawn： Firstly, the safety factor of the slope in the natural state and the rein-forcement-excavation state are beyond 1.0, but, the top of slope exceeding the excavating range is 0. 95 and it may be instable. Secondly, the planned excavation scheme can effectively restrain the yield zones of the slope excavated. However, it does not affect the top slope unexcavated too much.
出处
《中国农村水利水电》
北大核心
2012年第6期146-151,共6页
China Rural Water and Hydropower
