Characteristics and stability analysis of Xiari landslide at Lenggu hydropower station in the middle reach of the Yalong river
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摘要:
位于雅砻江中游的楞古水电站工程地质条件十分复杂，大型-巨型滑坡发育。以雅砻江楞古水电站夏日滑坡为例，在现场详细调查的基础上，采用试验测试和数值模拟等方法，研究了蓄水后滑坡的稳定性发展趋势。根据地貌形态、物质组成、钻孔资料以及现场调查，将夏日滑坡划分为三个区，其中Ⅱ区目前已经出现一定的变形破坏，稳定性最差。数值模拟表明，蓄水前，夏日滑坡整体稳定性较好，只在前缘局部出现变形；蓄水后，滑坡变形明显扩大，前缘沿先存的次级滑带滑动。提出在夏日滑坡前缘进行格构锚和抗滑桩支护，并利用InSAR技术对滑坡灾害隐患进行早期识别和监测预警。该研究为楞古水电站库岸滑坡防治提供了重要依据，并对同类型滑坡研究具有一定的参考意义。
Abstract:The engineering geological conditions of Lenggu hydropower station located in the middle reaches of Yalong River are very complex, and large-scale landslides are very developed. Taking Xiari landslide of Lenggu hydropower station on Yalong River as an example, the stability development trend of landslide after impoundment is studied by means of test and numerical simulation on the basis of detailed field investigation on the spot. According to the geomorphic morphology, material composition, drilling data and field investigation, the Xiari landslide is divided into three zones, among which the zone II has been deformed and damaged to some extent, and the stability is the worst. The numerical simulation shows that the overall stability of the landslide is fairly good before the impoundment, and the deformation only occurs at the front edge. After the impoundment, the deformation of the landslide is obviously enlarged and the front edge slides along the existing secondary slip zone. It is suggested that lattice anchor and anti-slide pile should be used at the front edge of the Xiari landslide, and the InSAR technology should also be used for early identification, monitoring and early warning of landslide hazards. This study provides an important basis for the prevention and control of reservoir bank landslide in Lenggu Hydropower Station, and has a certain reference significance for the study of the same type of landslide. This study provides an important basis for the prevention and control of reservoir bank landslide in Lenggu Hydropower Station, and has a certain reference significance for the study of the same type of landslide.
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表 1 岩土体物理力学参数取值表
Table 1. Values of mechanical parameters of rock and soil
岩性 密度
/(g·cm−3)体积模量
/MPa剪切模量/MPa 黏聚力
/(c·kPa−1)内摩擦角 
/(°)基岩 2.25 6200 3500 250 48 滑体（天然） 2.03 600 350 80 38 滑体（饱水） 2.09 320 180 50 31 第四纪崩坡积物 1.89 260 150 45 29 滑带（天然） 1.93 80 40 40 28 滑带（饱水） 1.98 45 20 15 22 
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