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本文对正在勘测设计中的小湾、漫湾大型水电站的区域工程地质问题——区域稳定性作了初步的分析和探讨。文中论述了区内的构造体系的归属,构造体系的复合关系,形变史和各构造体系的成生、发展过程等问题;判定了本区的构造应力场特征。根据区内及外围地区的震中分布特点及其现今构造应力场的方向与活动性断裂的关系,提出了电站区域内存在地震“空白区”的填空条件,并对南汀河断裂的活动规律、发震机制以及发震强度提出了看法;从中得到“断裂的发震位置与作用力的方向有关”、“发震强度则取决于构造应力及岩石介质条件”等认识。同时以地质构造背景为基础,结合地震活动规律、断裂各段的活动差异、介质条件等因素,对本区进行区域稳定性区划。从而对小湾、漫湾两电站的区域稳定性分别作出评价。
This article makes a preliminary analysis and discussion on the regional engineering geological problems of the Xiaowan and Manwan large hydropower stations under investigation and design - regional stability. This paper discusses the ownership of the tectonic system in the area, the compound relationship of the tectonic system, the deformation history and the formation and development of each tectonic system. The tectonic stress field characteristics of this area are also determined. According to the epicenter distribution in the area and the surrounding area and the relationship between the current tectonic stress field and the active fracture, the paper proposed the condition of void filling in the “blank area” of the earthquake in the power station area, The origin of earthquake, the mechanism of earthquake occurrence and the intensity of seismogenic shock. From this we can get the understanding that the location of seismogenic fault is related to the direction of acting force and the intensity of seismogenic vibration depends on the tectonic stress and rock media conditions. At the same time, based on the geological tectonic setting, combined with the laws of seismic activity, the differences of activities in each segment of fracture, medium conditions and other factors, the regional stability zoning is carried out. Thus, the stability of Xiaowan and Manwan hydropower stations are evaluated respectively.