长江三峡地区区域地壳稳定性评价

区域地壳稳定性是进行重大工程建设时必须研究的课题。本文分析了三峡地区区域地壳结构、地壳应力状态、地壳形变、断裂活动性及地震活动性等影响地壳稳定性的因素。利用两级模糊综合评判方法,对该区地壳稳定性作了分区评价。按区域稳定的四级划分标准,在三峡地区划分出三个稳定区、两个基本稳定区和两个次不稳定区。三峡工程坝址位于稳定区内,库区跨越了基本稳定区和次不稳定区。

EVALUATION OF THE REGIONAL CRUST STABILITY IN THE THREE GORGE AREAS OF THE YANGTZE RIVER

It is essential to study the subject for evaluating the regional crust stability before a large and important project is established. In this paper, the author analyses the factors which affect the crustal stability in the Three-Gorge areas, such as the regional crust structure, crustal dynamic features, active faults and seismic activities. Then, the regional crust stability in the areas was evaluated by means of the method of the two-grade Fuzzy comprehensive evaluation. According to the standards of the four stability grades put forward by prof. Liu Guochang, the author divided the areas into three stable regions, two sub-stable regions and two sub-unstable regions. The San Douping dam site locates in a stable region and the reservior crosses different stable regions in which the suitaining measures should be taken to deal with the specific engineering geological problems.