瀑布沟水电站库首右岸拉裂变形体变形特征与分析

 随着我国水电建设的大力发展，越来越多的大型工程遇到松动岩体稳定问题，松动岩体的变形特征及失稳机制十分复杂，亟待进一步研究。以瀑布沟水电站库首右岸拉裂变形体监测资料和地质资料为基础，总结出用监测数据分析拉裂变形体变形特征及失稳机制的方法，并与清江隔河岩茅坪滑坡、瀑布沟堆石坝上游坝坡的监测资料分析结果对比，验证该方法的可靠性。研究结果表明：(1) 拉裂变形体以块体错动的方式变形，且地形控制其优势错动方向；(2) 拉裂变形体的变形模式是局部渐进式错动，目前不同部位的岩体错动方向、错动时间等均存在较大差异，空间上未形成整体、时间上未形成统一的错动；(3) 根据竖直测斜孔监测分析结果反映的特征，将错动带分为两大类(I和II)，且将第I类进一步分为两小类(I1和I2)；(4) 利用锚索进行深部治理时应重视辨别错动带的类型，重点控制第I类错动带，同时还应重视随机锚杆的浅部治理；(5) 拉裂变形体的变形对降雨和蓄水不敏感。

CHARACTERISTICS AND ANALYSIS OF DEFORMATION OF TENSION-DISPLACED ROCK MASS ON RIGHT BANK AT HEAD AREA OF PUBUGOU HYDROPOWER STATION

With the rapid development of Chinese hydropower construction，more and more large-scale projects encounter the stability problems of dynamo-relaxed rock mass. The deformation characteristics and failure mechanism of dynamo-relaxed rock mass are very complex. Based on the monitoring data and geology data of the tension-displaced rock mass on right bank at head area of Pubugou hydropower station，analysis method of the displacement characteristics and failure mechanism using monitoring data has been summarized. In addition，the comparative analyses of deformation characteristics are made to verify the method among the tension-displaced rock mass of Pubugou，the Geheyan Maoping landslide on Qingjiang River and the upstream slope of Pubugou rockfill dam. The results show that：(1) The tension-displaced rock mass moves in the way of blocks dislocation；and the slope terrain controls the direction of dislocation. (2) The failure mode of the tension-displaced rock mass is in the partially gradual way；and suddenly global failure can hardly happen. Nowadays，there are major differences in dislocation direction，dislocation time of rock mass at different locations. (3) Using the monitoring data from vertical inclinometer hole，dislocation zones are divided into two categories (I and II)，and the class I is further divided into two sub-categories(I1 and I2). (4) The deep support using anchor cable should emphasize the identification of the type of dislocation zone and should especially control the Class I dislocation zone，and should emphasize the support of random bolting. (5) The tension-displaced rock mass is not sensitive to rainfall and to change in reservoir levels.