金沙江溪洛渡水电站拱坝及边坡稳定性分析研究

doi:10.13722/j.cnki.jrme.2023.0009

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摘要水电站拱坝和边坡的稳定性问题是目前诸多学者关注的热点问题。采用数值模拟与微震监测技术相结合的方法对溪洛渡水电站稳定性进行分析研究，分析不同蓄水位下拱坝和边坡应力、位移变化规律，探究拱坝及边坡稳定性与蓄水位的关系，研究边坡微震事件分布特征及微破裂类型，揭示高应力与微震事件之间的联系。研究结果表明：(1) 拱坝及边坡所受应力和位移与蓄水位呈正相关变化规律；拱坝在同一高程上所受应力与位移从下游面到上游面逐渐增大，在坝趾区出现了高应力聚集区以及大变形区。(2) 随着蓄水位的升高，边坡微震活动性逐渐增强，边坡深部岩体微破裂主要以拉伸破坏型为主，并伴随大量混合型以及小部分剪切型。(3) 边坡高应力区与微震事件聚集区在时空上存在一致性，边坡高应力是微震事件发生的内在驱动力。(4) 580 m蓄水位为溪洛渡水电站敏感特征蓄水位。研究成果对溪洛渡水电站安全稳定运行具有指导意义，对类似水电站及边坡稳定性的研究具有一定的参考价值。

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	吴静1
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	郭德宇1
	张乐文1
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	王龙江4

关键词 ：边坡工程, 溪洛渡水电站, 拱坝及边坡, 稳定性, 数值模拟, 微震监测

Abstract：The stability of arch dam and slope of hydropower stations is a hot issue that many scholars pay attention to. The stability of the Xiluodu hydropower station is studied by combining numerical simulation and micro-seismic monitoring technology. The variation law of the stress and displacement of arch dam and slope under different water levels is analyzed. The relationship between the stability of arch dam and slope and the water level is explored. The distribution characteristics of slope micro-seismic events and micro-fracture types are studied. The relationship between high stress and micro-seismic events is revealed. The results show that：(1) The stress and displacement of arch dam and slope are positively correlated with the water level. The stress and displacement of the arch dam at the same elevation gradually increase from the downstream surface to the upstream surface，and there are high stress accumulation areas and large deformation areas in the dam toe area. (2) The micro-seismic activity of the slope increases gradually with the water level. The micro-fracture of deep rock mass of slope is mainly tensile failure type，accompanied by a large number of mixed type and a small part of shear type. (3) The high stress area of the slope is consistent with the micro-seismic event gathering area in time and space，and the high stress of the slope is the internal driving force of the micro-seismic event. (4) The 580 m water level is the sensitive characteristic water level of Xiluodu hydropower station. The research results have guiding significance for the safe and stable operation of the Xiluodu hydropower station，which also have certain reference value for the stability study of the similar hydropower stations and slopes.

Key words： slope engineering Xiluodu hydropower station arch dams and slopes stability numerical simulation micro-seismic monitoring

引用本文:

吴静1，2，郭德宇1，张乐文1，3，王龙江4. 金沙江溪洛渡水电站拱坝及边坡稳定性分析研究[J]. 岩石力学与工程学报, 2023, 42(10): 2478-2495.
WU Jing1，2，GUO Deyu1，ZHANG Lewen1，3，WANG Longjiang4. Stability analysis of arch dam and slope of the Xiluodu hydropower#br# station on the Jinsha river. , 2023, 42(10): 2478-2495.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0009 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I10/2478

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