Application of a non-linear viscoelastic-plastic rheological model of soft coal on borehole stability

doi:10.1016/j.jngse.2016.03.026

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	Application of a non-linear viscoelastic-plastic rheological model of soft coal on borehole stability
	Liu, Chun 1; Zhou, Fubao 2; Kang, Jianhong 2; Xia, Tongqiang 2,3
	2016
会议日期	SEP 06-08, 2015
会议地点	Wuhan, PEOPLES R CHINA
关键词	Nonlinear rheological model Creep property Borehole stability
卷号	36
DOI	10.1016/j.jngse.2016.03.026
页码	1303-1311
英文摘要	Time dependent deformation of coal has a significant effect on the stability of underground structures. In this study, taking the visco-elastic plastic characteristics and the damage effect into account, a non-linear model was proposed to describe the creep behavior of soft coal. Meanwhile, the creep equations of the proposed non-linear model were derived and the three-dimensional creep equations were constructed by generalizing the one-dimensional creep equations. At the same time, the uniaxial creep tests on soft coal specimens under different axial stress conditions were carried out to validate the proposedmodel. It is found that the present model can not only reproduce the transient creep under low axial stress level, but also can accurately predict the steady and accelerating creep stages under high axial stress level. Finally, borehole stability in soft coal seam was investigated based on the proposed model. The results show that the vertical displacement and plastic zone range around borehole gradually increase while the increasing rate decreases and tends to be stable after 20 days. It can also be obtained that the creep duration tends to be stable when it is about 20 days after drilling excavation under the simulation conditions. The analysis results should be useful for the long-term stability of boreholes in soft coal seam for gas extraction. (C) 2016 Elsevier B.V. All rights reserved.
源文献作者	Int Soc Rock Mech, Chinese Acad Sci, Inst Rock Soil Mech, Natl State Key Lab Geomechan & Geotechnical Engn
会议录	JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
会议录出版者	ELSEVIER SCI LTD
会议录出版地	OXFORD
语种	英语
WOS研究方向	Energy & Fuels ; Engineering
WOS记录号	WOS:000390830300019
内容类型	会议论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4915]
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	1.CUMT, IoT Percept Mine Res Ctr ; 2.CUMT, Fac Safety Engn ; 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn
推荐引用方式 GB/T 7714	Liu, Chun,Zhou, Fubao,Kang, Jianhong,et al. Application of a non-linear viscoelastic-plastic rheological model of soft coal on borehole stability[C]. 见:. Wuhan, PEOPLES R CHINA. SEP 06-08, 2015.