F9断层遇水软化对高边坡稳定性的影响分析

Analysis on a High Slope Stability when Softening of F9 Fault under Wetting

位于阿尔塔什水利枢纽工程坝址右岸的高边坡稳定性是坝址主要工程地质问题之一,而F9断层是影响右岸高边坡稳定性的关键因素。F9断层影响带较宽,并且核部2 m的糜棱岩遇水软化现象明显,水库正常蓄水后,部分F9断层将浸泡在水中。因此,F9断层遇水软化特性可能是边坡稳定性的重要影响因素,需对F9软化特性进行深入研究,并分析其对右岸边坡稳定性的影响。以F9断层遇水软化的工程特性为出发点,在三维整体模型基础上,选择不同软化系数,采用数值模拟方法进行敏感性分析。探索在不同软化系数情况下,右岸高边坡的位移及塑性区变化规律,分析F9遇水软化后对边坡稳定性的影响,为F9断层处理方案的确定提供参考依据。结果表明,边坡位移和塑性区随软化系数减小而增大,当软化系数为0.2,F9断层全软化时,边坡整体稳定性较差。

Stability of the high slope Located on the right bank of Al Tash hydro project site is one of the main engineering geological problems at dam site,while the F9 fault is a key factor affecting the stability of the right bank slope. F9 fault zone with wide and 2 m mylonite in the core encounter water softening phenomenon obviously,after the reservoir water,part of the F9 fault will be soaked in water,therefore,F9 fault in water softening characteristics may be important influence factors of slope stability. To conduct the thorough research to the F9 softening properties,and studies its influence on the right bank slope stability. Articles to meet the engineering properties of water softening F9 fault as a starting point,the 3 d model based on the whole,choose different softening coefficient,the numerical simulation method for sensitivity analysis,the analysis under the condition of different softening coefficient change rule of the right bank slope displacement and plastic zone,it is concluded that F9 encounter after water softening influence on slope stability,provide a reference for the scheme determination of F9 fault treatment. Results show that the slope displacement and plastic zone along with the increase with the decrease of the softening coefficient,when the softening coefficient is 0. 2,F9 fault full softening,poor overall stability of slope.