成都理工大学学报（自然科学版）Issue(1)：18-25,8.DOI:10.3969/j.issn.1671-9727.2015.01.03
白龙江干流典型滑移-倾倒型滑坡的特征及形成机制
Characteristics and formation mechanism of typical sliding-toppling landslides in Bailong River trunk streams of Gansu,China
摘要
Abstract
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.关键词
白龙江干流/陡顺倾岩质斜坡/滑移-倾倒/滑坡/形成机制Key words
Bailong River/rock slope/sliding-toppling/landslide/formation mechanism分类
天文与地球科学引用本文复制引用
任光明,夏敏,曾强,贾逸,吕生弟,陆栋梁,刘荣清,赵海营,苟富民..白龙江干流典型滑移-倾倒型滑坡的特征及形成机制[J].成都理工大学学报（自然科学版）,2015,(1):18-25,8.基金项目
国家自然科学基金资助项目（41072229）。 （）
