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本文对正在设计勘测中的糯扎渡水电站区域构造稳定性问题进行探讨.文中论述了电站的区域地质构造背景,厘定了构造形式,分析了新构造运动特点、类型和现今构造应力场特征.从复杂的地震地质环境中找出地震活动时空分布特点和耿马——澜沧、思茅——普洱两地震区的强震迁移规律、提出了地震危险区划分原则,划出两个地震危险区,并根据区内历史强、大地震和两地震危险区对坝区的影响程度,确定工程区的地震基本烈度和地震动参数,对电站的区域构造稳定性作出评价。
This paper discusses the structural stability of the Nuozhadu Hydropower Station in the design and survey area.The article discusses the background of the regional geologic structure of the power station, determines the tectonic forms, analyzes the features and types of neotectonic movement and the present tectonic stress field characteristics. In the complex seismic geological environment, the spatial-temporal distribution of seismic activity and the strong earthquakes migration in the Gengma-Lancang and Simao-Pu’er earthquake regions are identified. The principle of seismic hazard division is proposed. Two seismic hazard zones are identified, According to the influence of the historical strong earthquakes and the two earthquake danger zones on the dam area, the basic earthquake intensity and the ground motion parameters in the project area are determined, and the regional structural stability of the power station is evaluated.