利用孔间CT成像对喀斯特岩体结构、电站坝基渗漏与稳定性研究

Using CT Imaging between Hole on the Karst Rock Mass Structure and Power Station Dam Foundation Seepage and Stability Research

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。

hydropower station dam Foundation rock of karst caves, karst fracture zone and tectonic development of broken rock such as defect control, prone to subsidence, leakage, resulting in power plant engineering deformation and instability. Karst development and structural change of carbonate rock is very closely connected, therefore, accurate diagnosis of the hydroelectric power station dam Foundation rock mass defect was significant. This use of perspective and CT Imaging of electromagnetic wave between holes, underground concealed carbonate rock structures in non-uniformity, corrosion crack belt interface, fractured structure, nature of crack filler and geometric spatial form for digital descriptions and characterizations. Combined with a hydropower station dam Foundation in Guangxi natural properties of carbonate rock structures, changing characteristics of rock mass structure of the measured data, further analysis in engineering under the action of stress distribution, deformation law of rock, forecast and found seepage of dam Foundation and stability and thus reasonable to develop effective treatment measures.