Microstructure characteristic and mechanical behavior of mudstone under water environment

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	Microstructure characteristic and mechanical behavior of mudstone under water environment
	Chen, J.; Feng, X. T.; Jiang, Q.; Li, S. J.; Gao, H.
	2012
会议日期	OCT 14-16, 2011
会议地点	Beijing, PEOPLES R CHINA
页码	75-79
英文摘要	Under water environment, the mudstone has poor properties, such as hydrophilicity, expansibility and disintegration, which are of great challenges in the supporting design and excavation of underground openings. This paper aims at the study of water-weakening mechanism of the mudstone by several experimental methods. (1) Powder X-ray diffraction was conducted to obtain the mineral composition. (2) The uniaxial compression of mudstones in five conditions with water contents respectively nearly 0 (dry state), 1.04%, 1.32%, 1.75%, 1.88% (saturated state) were discussed. (3) The changes of microstructure in different water contents were studied by scanning electron microscope. The results show that the mudstone mainly contains chlorite, quartz, illite and calcite with the contents about 25%, 20%, 25%, 17% respectively, mixed up with small amount of feldspar, dolomite and hematite account for 5%, 5%, 3% respectively. With the increase of water contents, the water film between mineral particles becomes thicker and the mudstone starts to expand which lead to the uneven inner-stress. Meanwhile, part of colloidal substance is dissolved and the joints become loose. All of these lead to form a lot of micro-pores that damage the internal structure system. As a result, the peak strength and the mechanical parameters gradually decline with water contents increase until to a stable state.
源文献作者	Cai, M
会议录	ROCK MECHANICS: ACHIEVEMENTS AND AMBITIONS
会议录出版者	CRC PRESS-TAYLOR & FRANCIS GROUP
会议录出版地	BOCA RATON
语种	英语
WOS研究方向	Engineering
WOS记录号	WOS:000347395400012
内容类型	会议论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4655]
专题	岩土力学所知识全产出_会议论文国家重点实验室知识产出_会议论文
作者单位	Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn
推荐引用方式 GB/T 7714	Chen, J.,Feng, X. T.,Jiang, Q.,et al. Microstructure characteristic and mechanical behavior of mudstone under water environment[C]. 见:. Beijing, PEOPLES R CHINA. OCT 14-16, 2011.