工程地质学报2018，Vol.26Issue(2)：309-318,10.DOI:10.13544/j.cnki.jeg.2016-562
大光包滑坡层间错动带岩体剪切特性研究
SHEAR BEHAVIORS OF ROCK MASS IN THE INTERLAYER FAULT ZONE OF DAGUANGBAO LANDSLIDE
摘要
Abstract
The slide surface of Daguangbao landslide is developed in the interlayer fault zone where the fragmentation degree of rock mass is increased from the upper to the lower with a belt of mud at the bottom.18 groups of medium-sized direct shear tests were carried out for the samples collected from Daguangbao interlayer fault zone.42 groups of unconsolidated direct shear tests were carried for the samples collected from mud belt and mylonite belt by controlling the moisture content.The results show that the shear characteristics of the rock mass in interlayer fault zone are related to the degree of fragmentation.Characteristics of strain softening of rock mass with lower degree of fragmentation is more obvious while the shear strength of rock mass with higher degree of fragmentation is worse.The shear strength and the friction angle of mylonite are mostly greater than the soil in the mud belt and the shear characteristics of mylonite is less affected by the ground water than the mud.The shear strength and cohesive strength of the soil in the mud belt are decreased rapidly with the increase of moisture content.The internal friction angle has a negative exponential relation with the moisture content.The shear strength of the soil in mud belt can be greatly reduced with the intrusion of groundwater caused by the rock mass dilatancy during the earthquake.The results of this study are important for understanding the position of the slip surface.It is also important for understanding the influence of the increase of moisture percentage and the further fragmentation on the shear strength of the rock mass in the fault zone.关键词
大光包滑坡/层间错动带/剪切特性/碎裂程度/含水率Key words
Daguangbao landslide/Interlayer fault zone/Shear characteristics/Fragmentation degree/Moisture content分类
天文与地球科学引用本文复制引用
孟祥瑞,裴向军,黄润秋,崔圣华,朱凌,詹威威..大光包滑坡层间错动带岩体剪切特性研究[J].工程地质学报,2018,26(2):309-318,10.基金项目
国家重点研究计划(2017YFC1501000),强震山区特大地质灾害致灾机理与长期效应研究,国家自然科学基金项目(41572302),国家自然科学基金创新研究群体项目(41521002)资助. （2017YFC1501000）
