CAJ | 학술논문

探讨中陡倾角顺层岩质斜坡发生倾倒变形的特征、发育条件及形成机制。白龙江干流受区域构造环境条件的影响，纵向河谷发育，河谷两岸志留系白龙江群的砂质板岩、千枚岩等较发育，尤其在甘肃的舟曲、武都一带以软质、薄层状的绢英、碳质千枚岩为主。这些干流段岸坡稳定性较差，尤其是顺层岸坡段滑坡较发育，且多以滑移-弯曲（溃曲）、滑移-拉裂模式为特征。通过对白龙江干流水泊峡水电站的Ⅶ＃滑坡、碧口水电站库区的青崖岭滑坡与孟家干沟滑坡的现场调查、分析，揭示了在陡顺倾层状岩质斜坡中还发育一种特殊的倾倒变形破坏模式，即滑移-倾倒模式。该类变形多发育在临空条件好、坡度40°以上由软硬相间或软硬互层状、岩层倾角一般在65°以上的高陡层状岩质斜坡中，是在斜坡应力场或遭受水、地震等作用下，坡脚首先发生初始倾倒变形，同时上部岩体发生滑移-倾倒，最终岩层发生连续弯曲变形、根部折断，折断面贯通而形成滑坡。
탐토중두경각순층암질사파발생경도변형적특정、발육조건급형성궤제。백룡강간류수구역구조배경조건적영향，종향하곡발육，하곡량안지류계백룡강군적사질판암、천매암등교발육，우기재감숙적주곡、무도일대이연질、박층상적견영、탄질천매암위주。저사간류단안파은정성교차，우기시순층안파단활파교발육，차다이활이-만곡（궤곡）、활이-랍렬모식위특정。통과대백룡강간류수박협수전참적Ⅶ＃활파、벽구수전참고구적청애령활파여맹가간구활파적현장조사、분석，게시료재두순경층상암질사파중환발육일충특수적경도변형파배모식，즉활이-경도모식。해류변형다발육재림공조건호、파도40°이상유연경상간혹연경호층상、암층경각일반재65°이상적고두층상암질사파중，시재사파응력장혹조수수、지진등작용하，파각수선발생초시경도변형，동시상부암체발생활이-경도，최종암층발생련속만곡변형、근부절단，절단면관통이형성활파。
This paper researches on the characteristics the formation conditions and mechanism of the toppling deformation occurring on the medium-steep bedding rock slopes.The longitudinal valley is well developed along the Bailong River trunk streams influenced by regional geotectonic conditions. The Silurian sandy slate and phyllite are well developed in this area,especially the soft thin-layered sericite quartz and carbonaceous phyllite exposed in Zhouqu and Wudu regions.They leading to the lower stability of bank slopes.Particularly,the landslides are more likely to occur in the bedding slopes as the failure modes of sliding-toppling and sliding-tension.Further,a special toppling failure mode is founded on the steep bedding rock slopes,namely,the termed sliding-toppling mode,based on the field investigations associated with Ⅶ# landslide situated in the Shuiboxia hydropower station, the Qingyaling landslide and the Mengj iagangou landslide situated in the Bikou hydroelectric power station on the Bailong River.It can be concluded that the sliding-toppling mode is primarily well developed on the steep bedding rock slopes with alternating soft and hard layers.These rock slopes generally have a favorable free surface condition with the angle of slope greater than 40°and the strata dip angle greater than 65°.The formation mechanism is induced by the slope stress field,water or earthquake.The initial deformation occurs at the lower part of the slope,along with the sliding-toppling at the upper part.Finally,the continuous toppling failure surface appears in the basal plane and results in the landslide.