老挝色拉龙一级水电站河床坝基抗滑稳定研究  

Study on Anti-Sliding Stability of Riverbed Dam Foundation of Xe Lanong I Hydropower Station in Laos

作　　者：冉从彦 林红 曲海珠 RAN Congyan;LIN Hong;QU Haizhu(PowerChina Chengdu Engineering Co.,LTD,Chengdu,Sichuan,610072)

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《四川水力发电》2020年第6期112-115,121,共5页Sichuan Hydropower

摘　　要：老挝色拉龙一级水电站位于东南亚典型的红层地区,坝基岩性组合复杂,层面裂隙及顺层裂隙较为发育且倾角较缓,大坝尤其是河床高坝段存在深层抗滑稳定问题。施工期借助大坝下游齿槽开挖以及河床坝段灌浆孔取芯、钻孔电视等手段,对影响大坝抗滑稳定的缓倾结构面的分布深度、性状、连通率等进行多维度分析,提出了各类型软弱结构面的物理力学参数,在此基础上分析得出河床高坝段主要存在以层面裂隙及顺层裂隙为底滑面,在大坝下游侧以Ⅲ类、Ⅳ类岩体中的剪出面为滑动面,从而形成双滑面组合的深层滑动模式。参数和滑移模式的明确,为进一步验算和评价大坝抗滑稳定提供了可靠的基础资料,也为东南亚红层地区类似大坝稳定性计算提供借鉴和参考。Xe Lanong I Hydropower Station is located in the typical red bed region of Southeast Asia where the bedrock combination of the dam is complex,and the layer fractures and bedding fractures are relatively developed and the dip angle is relatively slow.There are deep anti-sliding stability problems in the dam,especially in the high dam section of the riverbed.During the construction period,the distribution depth,properties and connectivity rate of gently inclined structural planes which affect the anti-sliding stability of the dam are analyzed by means of the downstream alveolar excavation,grouting hole coring at riverbed and borehole television.The physical and mechanical parameters of various types of weak structural planes are proposed.On this basis,it is concluded that there are mainly layer fractures and bedding fractures as the bottom sliding surface at the high dam section of the riverbed,and the shear surfaces in class III and IV rock mass are found as the sliding surface at the downstream side of the dam,thus forming a deep sliding mode of double sliding surface combination.The definition of the parameters and slip mode provides reliable basic data for further checking and evaluating the stability of the dam,and also provides reference for similar dam stability calculation in the red bed region of Southeast Asia.

关 键 词：顺层裂隙 抗滑稳定 地质条件 连通率 

分 类 号：TV74[水利工程—水利水电工程] S152.47[农业科学—土壤学]