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古水水电站争岗滑坡堆积体方量多达4750多万m3,为世界少有的大型滑坡堆积体。针对工程地质条件的特殊性,研究了滑坡体形成机理和失稳破坏模式;底滑面确定的基础上依据降雨过后变形区域失稳破坏过程,提出剖面随机组合法反演分析,与现场勘测、室内试验结果及类似工程经验取值进行对比,寻找出合理的计算参数;在此基础上进行稳定性评价,得知滑坡体正常工况下处于蠕滑变形状态,各种工况下均存在滑塌的可能性,必须进行开挖加固治理;根据不同的失稳破坏模式,将其分为I区、Ⅱ区,研究了多种治理方案,推导出抗滑桩作用下滑面安全系数表达式,通过对比、优化,寻求出经济合理的综合治理措施;结果表明,治理后不仅局部稳定性得到了提升,整体稳定性也得到保证。
Gushui hydropower station landslide volume of up to 47.5 million cubic meters of accumulation, is the world’s rare large landslide accumulation body. According to the particularity of engineering geological conditions, the formation mechanism of landslide body and the failure mode of failure are studied. Based on the determination of bottom slip surface, according to the failure process of deformation area after rainfall, Indoor test results and similar engineering experience value comparison to find a reasonable calculation parameters; on this basis, the stability of the assessment, that the landslide body in normal conditions in the creeping deformation state, there are under various conditions slip According to different instability failure modes, it is divided into area I and area II. Various control schemes are studied, and the expression of safety factor of sliding surface under the action of anti-slide piles is deduced. Through contrasting and optimizing, seeking out economic and reasonable comprehensive control measures; the results show that not only the local stability is improved, but also the overall stability is guaranteed.