Formation and evolution of Emeishan basalt saprolite in vadose zones of Touzhai landslide source rockmass

doi:10.1007/s11629-016-4169-y

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > Journal of Mountain Science > Journal of Mountain Science-2017 > Vol14 No.6

	Formation and evolution of Emeishan basalt saprolite in vadose zones of Touzhai landslide source rockmass
	YANG Ji-qing; XU Ze-min; ZHANG Rui; CHEN Ji-pu; REN Zhe; LUO Rong-zhang; ZHANG Xiu-shuo
刊名	Journal of Mountain Science
	2017-06
卷号	14 期号:6 页码:1174-1184
关键词	Vadose Zone Emeishan Basalt Scanning Electron Microscopy Saprolite Corestone Touzhai Landslide
ISSN号	1672-6316
DOI	10.1007/s11629-016-4169-y
通讯作者	XU Ze-min
文献子类	期刊论文
英文摘要	In order to explain the formation process of slope hazards, and to identify the key factors leading to instability of a slope,Emeishanbasalt saprolite in vadose zones of the Touzhai landslide in Zhaotong, Yunnan, was studied. The formation and evolution of Emeishan basalt saprolite was examined using, amongst other techniques, field investigations, thin section analysis, scanning electron microscopy (SEM) observations, chemical analysis, physical and water-physical property tests of rock masses.Fieldobservations revealed that the majority of the weathered rock blocks were presented as a concentric layer structure in which an internal corestone was enveloped with several layers of external saprolized crust. Chemical and mineralogical analysis identified that iron was the most sensitive element and that the weathering progress usually started with the oxidation of Fe2+ to Fe3+ in rock blocks. Alkaline elements such as Si, Ca, Mg, Na and K were also dissolved and Fe and Al were concentrated in saprolized crusts. Results indicated that loss on ignition (LOI) also increased significantly. SEM results showed that the weathering intensity of the basalt blocks decreased gradually from the outside to the inside, and the mineral morphology significantly differed on both sides of the weathering front. The saprolized crusts presented cellular microstructure features due to the generation of micropore and clay minerals. Thin section analysis showed that plagioclase was relatively more stable than pyroxene and chlorite during weathering. With a centripetal propagation of the weathering front, saprolized crusts became thicker and corestones became smaller; fresh Emeishan basalt blocks gradually turned into saprolized blocks. Due to the loose structure and low strength of saprolite, the quality of the Emeishan basalt mass significantly deteriorated, this being a potentially important factor which caused the Touzhai landslide to occur.
语种	英语
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/18735]
专题	Journal of Mountain Science _Journal of Mountain Science-2017_Vol14 No.6
推荐引用方式 GB/T 7714	YANG Ji-qing,XU Ze-min,ZHANG Rui,et al. Formation and evolution of Emeishan basalt saprolite in vadose zones of Touzhai landslide source rockmass[J]. Journal of Mountain Science,2017,14(6):1174-1184.
APA	YANG Ji-qing.,XU Ze-min.,ZHANG Rui.,CHEN Ji-pu.,REN Zhe.,...&ZHANG Xiu-shuo.(2017).Formation and evolution of Emeishan basalt saprolite in vadose zones of Touzhai landslide source rockmass.Journal of Mountain Science,14(6),1174-1184.
MLA	YANG Ji-qing,et al."Formation and evolution of Emeishan basalt saprolite in vadose zones of Touzhai landslide source rockmass".Journal of Mountain Science 14.6(2017):1174-1184.