COMPREHENSIVE ASSESSMENT OF ENGINEERING GEOLOGICAL ENVIRONMENT IN HYDROELECTRIC DEVELOPMENT ZONE, JINSHAJIANG RIVER
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摘要: 金沙江所流经的川滇交界地区是中国西南典型的活动构造区, 区内地震及地质灾害十分严重, 所以在金沙江水电梯级规划中, 进行该区域的工程地质环境系统评价尤为重要.本文选取对工程地质环境有较大影响的九种因素, 从地壳稳定性、地面稳定性、岩土体稳定性三方面建立层次分析模型.根据层次分析所取得的因素权重值, 按好、较好、一般、较差、差5个等级进行工程地质环境质量综合评价及分区.工程地质环境特征的分区性向我们显示各梯级工程规划选址区所存在的重大工程地质问题.Abstract: The intersection between Sichuan and Yunnan Provinces through which flows the Jinshajiang River, is a typical active tectonic zone in southwestern China. In this intersection zone, occur strong neotectonic activities accompanied by various endogenic and ectodynamic geological hazards. In this case, the engineering geological environmental system in this region should be evaluated in the planning of the Jinshajiang hydroelectrical gradient project. In this paper, nine factors closely related to the engineering geological environment are chosen to establish a hierarchical analysis model in terms of crust stability, ground stability, and rock and soil mass stability. The factor weighing values obtained from the hierarchical analysis are used to make a comprehensive assessment and zoning of the engineering geological environment quality in the following five categories: poor, relatively poor, normal, relatively good, and good. The zoning of the engineering geological environment indicates that some important engineering geological problems are present in the site selection regions for different gradient engineering projects.
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图 1 工程地质环境质量评价层次分析模型
Fig. 1. AHP analysis model of engineering geoenvironmental evaluation
图 3 工程地质环境质量等级分区及各梯级电站位置
Ⅰ.好; Ⅱ.较好; Ⅲ.一般; Ⅳ.较差; Ⅴ.差; 各梯级电站名称见表 5
Fig. 3. Classification zoning of environmental quality with respect to engineering geology
表 1 平均随机一致性指标值
Table 1. Average value of random identity parameters
表 2 层次单排序计算结果
Table 2. Factors' weighting arrangement of each layer
表 3 层次总排序
Table 3. Hierarchy overall line in order
表 4 工程地质环境质量分级及单因素判别指标综合表
Table 4. Grades of geological environmental quality and evaluation standards for single factor
表 5 金沙江中下游各规划枢纽区工程地质环境质量综合评价
Table 5. Comprehensive assessment on each planning site
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[1] 李国和, 王思敬, 尚彦军, 等. 川滇交界地区地壳结构及现代地壳活动模式[J]. 地质力学学报, 2000, 6(2): 82-91. https://www.cnki.com.cn/Article/CJFDTOTAL-DZLX200002012.htm [2] 王思敬, 李国和. 金沙江流域区域地壳稳定性分区与定量评价[J]. 工程地质学报, 1998, 6(4): 289-299. https://www.cnki.com.cn/Article/CJFDTOTAL-GCDZ804.000.htm [3] 王思敬, 黄鼎成. 攀西地区环境工程地质[M]. 北京: 海洋出版社, 1990. [4] 王莲芳. 层次分析法引论[M]. 北京: 中国人民大学出版社, 1990. -
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