巫山县望霞危岩体破坏及变形趋势预测

Deformation Trend Forecasting and Failing Mechanism of Wangxia Dangerous Rock Body in Wushan County

2010年10月21日三峡库区望霞危岩体发生崩滑灾害后,危岩体极不稳定,在降雨等作用下,可能会再次失稳,特别是悬挂在陡壁上约7万m3危岩体下滑的可能性更大,威胁下方乡村道路、村民、煤码头及长江航运的安全。在对近几次发生的崩滑灾害和新裂缝的详细调查、变形历史及根据监测数据分析的基础上,对望霞危岩体形成过程、变形机理及特征进行了综合分析。研究结果表明:受控于硬软相间的地层岩性组合及危岩体裂隙发育的情况下,持续性降雨、重力卸荷及采煤掏空扰动等共同作用造成了危岩体变形失稳。目前该危岩体总体向SW方向位移,具有明显的沉陷变形特征,且呈匀速变形,变形趋势持续增大,危岩体处于不稳定状态。

After the disaster on October 21 in 2010 year,the Wangxia dangerous rock mass in Three Gorges Reservoir area is extremely unstable.In the rainfall and other effects,the instability collapses may be again jitter.The dangerous rock which volume is of 7 × 10 4 m 3 and is hanging danger rock mass on the steep cliff will slide likely.Underneath of rural roads,village,coal terminal and the safety of the Yangtze River shipping will be under threat.Therefore this article unified nearly several times collapses the disaster,the detailed investigation of the new cracks,the deformation history.Based on the monitor data analysis foundation,it comprehensively analyzed danger rock mass forming process,the deformation mechanism and the features.The results show that: controlled by composition of a typical hard-soft lithologic association mode and dangerous rock fracture development situation,because of the long-enduring rainfall,gravity unloaded and emptying disturbances such as coal mining under the joint action,dangerous rock mass deformation is instable.At present,the overall displacement direction of the dangerous rock body is towards to SW with obvious subsidence deformation,and shows a uniform deformation,deformation trend of growing,dangerous rock mass instability.