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岩溶水电站坝基受岩体中发育的溶洞、溶蚀裂隙带及构造破碎带等岩体缺陷的控制,容易产生塌陷、渗漏,导致电站工程变形、失稳。岩溶发育与碳酸盐岩的岩体结构改变关系十分密切,因此,对水电站坝基岩体缺陷的准确诊断意义重大。本文利用孔间电磁波透视及CT成像技术,对地下隐伏碳酸盐岩岩体结构的非均匀性,溶蚀裂隙带分界面,裂隙结构体、裂隙充填物性质及几何空间形态等进行了数字描述和刻画。并结合广西某水电站坝基碳酸盐岩岩体结构的自然特性,岩体结构变化特征的实测数据,进一步分析在工程作用下应力分布状态,岩体变形破坏规律,预测和判定坝基渗漏和稳定性,进而合理制定有效处治措施。
The dam foundation of karst hydropower station is controlled by rock defects, such as karst caves, dissolution fracture zone and structural fractured zone, which are prone to collapse and seepage, resulting in deformation and instability of power station engineering. The development of karst is closely related to the change of rock mass structure of carbonate rocks. Therefore, it is of great significance to accurately diagnose the rock mass defects of dam foundation of hydropower station. This paper describes the heterogeneity of underground concealed carbonate rock mass structures, the interface of dissolution fractured zone, the structure of fractured structures, the properties of fractured stuffings and the geometrical spatial morphology by using the inter-hole electromagnetic wave and CT imaging techniques Portrayed Based on the natural characteristics of dam rockfill carbonate rock mass structure and the change characteristics of rock mass in a certain hydropower station in Guangxi, the stress distribution and deformation and failure of rock mass are further analyzed to predict and determine the seepage and stability of dam foundation Sex, and then develop a reasonable treatment measures.