基于多种传统方式融合的断层识别

Fault Identification based on the Fusion of Multiple Traditional Methods

断层识别对地质灾害的防控以及大型工程的建设和维护至关重要。以陕西省某抽水蓄能电站工程下水库断层F1为例,使用平洞调查、地貌分析、钻孔分析、物探分析、数学计算等方式对此断层的发育特征和空间分布特征进行综合推断。结果表明:通过平洞调查,F1断层充填了约35 cm厚的断层泥,上盘产状为N45°W,SW∠65°~75°;下盘产状为N80°W,SW∠50°~55°;受地应力作用,上盘岩体破碎。通过地貌特征分析,断层下盘岩体完整性较好,上盘岩体破碎,地表出露以碎裂结构为主,岩块中隐微裂隙极为发育;通过物探分析,得出F1断层的走向NE40°~69°SE∠65°~75°,延伸长度大于20 km,断裂带宽10~20 m;通过对地貌特征分析、物探分析、钻孔分析、数学计算分析等方式综合推测出了断层F1的空间展布特征。本综合断层识别方法可为大型水电工程的断层识别提供参考和借鉴。

Fault identification is crucial to the prevention and control of geological disasters and the construction and maintenance of large-scale projects.In this paper,taking the reservoir fault F1 under a pumped storage power station project in Shaanxi Province as an example,the development characteristics and spatial distribution characteristics of the fault are comprehensively inferred by means of adit survey,geomorphological analysis,borehole analysis,geophysical analysis,mathematical calculation,etc.The results show that through the adit survey,the F1 fault is filled with fault mud about 35 cm thick,and the upper wall occurrence is N45°W,SW∠65°~75°,and the lower wall occurrence is N80°W,SW∠50°~55°;Due to in-situ stress,the upper wall rock mass is broken.Through the analysis of geomorphological characteristics,the integrity of the rock mass in the lower wall of the fault is good,the rock mass in the upper wall is broken,the surface outcropping is dominated by fragmentation structure,and the hidden micro-fractures in the rock block are extremely developed.Through geophysical analysis,it is concluded that the strike of the F1 fault is NE40°~69°SE∠65°~75°,the extension length is more than 20 km,and the fault width is 10~20 m.The spatial distribution characteristics of fault F1 are comprehensively inferred through geomorphological feature analysis,geophysical analysis,borehole analysis,mathematical calculation and analysis.The comprehensive fault identification method in this study can provide reference for fault identification of large-scale hydropower projects.