滑石板顺层岩质高边坡稳定性及加固措施研究

 针对两家人水电站滑石板顺层岩质高边坡工程地质条件的特殊性，研究该边坡在1996年地震过后降雨条件下的滑塌成因，滑石板边坡在侧滑面、底滑面已经非常明显以及后缘拉裂面基本可以确定的条件下，有2个基本问题需要明确：(1) 侧滑面和后缘拉裂带的贯通率；(2) 底滑面岩体力学参数的取值。2个基本问题的确定通过滑石板边坡历史上已滑塌区域的边坡失稳破坏过程来反演分析，并且与中国水电工程顾问集团公司贵阳勘测设计院现场勘测、岩石室内试验结果以及国内类似边坡工程的经验取值进行对比分析，寻找出最为合理的计算参数。在此基础上对边坡进行稳定性分析，由于边坡在非正常工况下存在滑塌的可能性，因此对边坡进行加固处理是必要的，通过对边坡加固位置的计算分析可知，对边坡底部进行加固处理不仅能够提升局部的稳定性，同时也能保证边坡整体稳定性。在此基础上设计了3种加固方案，对这3种加固方案进行计算分析，可寻找出最为经济合理的一种加固方案。

INVESTIGATION ON SLOPE STABILITY AND REINFORCEMENT METHOD OF HUASHIBAN HIGH ROCK BEDDING SLOPE

Mainly aiming at the special geological engineering condition of Huashiban high rock bedding slope in Liangjiaren Hydropower Station，investigation on the sliding reason of the slope because of the rainfall condition after the earthquake in 1996 is carried out. The side and bottom sliding surfaces and the slope offside tensile rupture zone can be determined，there are two basic problems should be confirmed：(1) run-through ratio of the slope side and offside；and (2) the determination of rock mass mechanical parameters of the bottom sliding surface. The method to confirm these two basic problems through the back analysis of the sliding process of the slope which has been sliding in the history because of the earthquake and the rainfall，and then to compare the back analysis result from local reconnaissance with the rock experimentation results by the Guiyang Investigation and Design Institute，China Hydropower Engineering Consulting Group Co.，and the empirical values of the similar rock slope engineering in China，finally，the reasonable computing parameters are obtained. After above- mentioned work，the slope stability of the Huashiban rock high slope is analyzed，it is shown that Huashiban rock high slope will fail in abnormal state. So it is necessary to reinforce the slope. The computing results of the reinforcement position show that the reinforcement of the bottom slope can not only improve the local slope stability，but also improve the whole slope stability. Then，three reinforcement schemes based on the above work are designed；and the effects of these three reinforcement schemes on slope stability are analyzed. Finally，an optimum reinforcement scheme，which is economical and reasonable，is presented.