重大工程场址的地壳稳定度及其应用

依据板块构造和岩石圈动力学研究结果,以不同规模的活动断裂或地壳活动带作为边界可把地壳分成不同规模的地块,相对稳定的地块称为安全岛。提出用稳定度(△f)的概念来定量表达安全岛的稳定程度,从而为选定和评价重要工程场址提供了一种新的途径。文章以黑山峡水坝选址为例进行了应用研究,提出该峡段小观音和大柳树两地均可作为坝址的结论。

STABLE PARAMETER OF THE EARTH'S CRUST AND ITS APPLICATION TO SELECTION OF IMPORTANT ENGINEERING SITES

Based on the plate tectonics and Hthosphere dynamics. the earths crust could be divided into different-scale landmasses according to a series of active fault systems or crustal defomation zones as boundaries, in which relative stable landmasses are called safety islands. The concept of stable parameter (△f) is suggested to express the stable state of a safety island quantitatively. Thus, it is a new method introduced for selecting and evaluating regional stability or safety of a site for important engineering project. As an example, it is applied to optimize seeking and evaluating dam sites in Heishanxia area of Huanghe River, and it is concluded that both Xiaoguangyin and Daliushu sites can be selected for high dams.