三峡库区危岩体劣化特征及变形破坏模式研究

Degradation Characteristics and Deformation Failure Mode of Perilous Rock Mass in the Three Gorges Reservoir Area

依托三峡库区黄岩窝危岩体为工程背景,采用调查测绘、单孔声波法、孔内高清摄像及物探测试手段分析黄岩西段的岩体劣化特征,并探讨了危岩的变形破坏模式。研究结果表明:黄岩窝危岩消落带沿临江崖壁向内延伸18 m区域内的岩体劣化程度高,危岩体3种基本变形破坏模式表现为溃屈滑移式、倾倒式和坠落式;在自重作用、溶蚀作用及江水涨落掏蚀等影响下,易诱发上部岩体发生滑移式、倾倒式或坠落式的复合型变形破坏。

Based on the project background of Huangyanwo Perilous Rock mass in the Three Gorges Reservoir Area,the deterioration characteristics of the rock mass in the west section of Huangyanwo were analyzed by means of surveying and mapping,single-hole acoustic wave method,in-hole high-definition video recording and geophysical prospecting test,and the deformation and failure mode of the perilous rock mass was discussed.The results show that the rock mass in the Huangyanwo Perilous Rock falling zone extending 18m inward along the riverside cliff has a high degree of deterioration,and the three basic deformation failure modes of the perilous rock mass are buckling sliding,toppling and falling.Under the influence of self-weight,corrosion and river water fluctuation and erosion,it is easy to induce sliding,toppling or falling composite deformation failure of the upper rock mass.