【摘要】 乌弄龙水电站坝前堆积体成因主要为崩塌堆积,岩土物理力学试验成果及现场天然休止角测量成果对选取岩(土)体的力学参数具有较好的参考价值。采用刚体极限平衡法和有限元强度折减法对堆积体的稳定性进行计算分析,评价认为在天然状态下,坝前堆积体稳定性好;水库蓄水后,堆积体前部(约70 m高差)处于库水位以下,堆积体基本稳定;在蓄水和地震工况下其稳定性降低,存在失稳的可能性,可能产生的破坏形式为前缘调整性坍岸再造。针对澜沧江上游段类似的大型崩塌堆积体,分析总结了一套松散堆积体稳定性分析评价方法,对类似工程地质问题(特别是澜沧江上游江段水电工程)研究有一定的借鉴意义。更多还原

【Abstract】 The collapsed accumulation body in front of dam at Wunonglong Hydropower Station is mainly made up of collapsed accumulation,geotechnical physical and mechanical test results and site natural angle of repose measuring results are good reference values for selecting mechanical parameters of rock mass.After using limit equilibrium method and shear strength reduce method to calculate and analyze stability of the collapsed accumulation body,we can draw some conclusions as follows: the collapsed accumulation body is stable in natural conditions;the lower anterior part of the collapsed accumulation body(about 70 m height difference) will be under the reservoir water level after reservoir impoundment,and the whole accumulation body is basically stable;however,it will be instable under the condition of impoundment and earthquake,and the possible failure mode is reservoir bank reconstruction.We analyze and summarize a set of methods to assess the stability of the loose collapsed accumulation body,meanwhile,it has significance for similar engineering geological problems research,especially for the hydropower projects on the upper reaches of Lancangjiang River.更多还原