ASSESSMENT OF CRUSTAL STABILITY IN THE QINLING-DABA REGION
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摘要: 三峡水库引水工程是南水北调的重要补充工程, 具有重要的战略意义和经济意义。本文在分析现今构造应力场、地壳结构、构造格架、活动断裂、地震活动、工程岩组等影响地壳稳定性主要因素的基础上, 利用模糊数学综合评价模型评价秦巴地区的地壳稳定性。评价结果表明, 秦巴地区地壳稳定性程度较高, 适合兴建大型引水工程。Abstract: The Three Gorges reservoir water-diversion project is a new line of the south-north water diversion project.There are six major factors affecting the crustal stability in the region :crustal structure, present tectonic stress fields, tectonic framework, fault activity, earthquake activity and rock properties. The authors select dominant conditions affecting regional crust stability as evaluating factors to construct a fuzzy evaluation model.Based on the above-mentioned six factors and by using the fuzzy evaluation model, the authors evaluate the crustal stability of the Qinling-Daba region.The results show that the Qinling-Daba region has a higher degree of crustal stability and is and suitable for the large water diversion project.
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图 1 秦巴地区构造稳定性综合研究图
Figure 1. Comprehensive map of structural stability in the Qinling-Dabashan region
图 3 区域地壳稳定性模糊数学评判结果
Figure 3. Fuzzy judgement of crustal stability in the Qinling-Daba region
图 4 区域地壳稳定性分区
1.不稳定; 2.较不稳定; 3.较稳定; 4.稳定; 5.稳定性分区界线; 6.引水线路
Figure 4. Zonation of regional crustal stability in the Qinling-Daba region
表 1 岩石力学实验与声发射、水压致裂法地应力测量结果
Table 1. Rock mechanics experiments and geostress measurements by acoustic emission (AE) and hydrofracturing techniques
表 2 主要断裂活动性与工程安全性评价对比表
Table 2. Comparison of the activities of main active faults and engineering safety evaluations
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