A methodology based on strain analysis for identifying potential discontinuous deformation zones in sublevel caving mines

doi:10.1016/j.enggeo.2020.105872

	A methodology based on strain analysis for identifying potential discontinuous deformation zones in sublevel caving mines
	Pang, Hansong 2,3; Chen, Congxin 2,3; Xia, Kaizong 2,3; Deng, Yangyang 2,3; Zhang, Chuqiang 1; Sun, Chaoyi 2,3
刊名	ENGINEERING GEOLOGY
	2020-12-20
卷号	279 期号:-页码:16
关键词	Sublevel caving Discontinuous deformation zone Cracking Tensile crack Horizontal ground strain Break angle
ISSN号	0013-7952
DOI	10.1016/j.enggeo.2020.105872
英文摘要	Underground mining operations using the sublevel caving method often result in discontinuous ground deformations involving surface cracks. Determining the limit of the discontinuous deformation zone is important for the relocation of neighbouring residential areas, mining infrastructure, and the planning of underground mining operations. The limit of the discontinuous deformation zone is characterised by the outermost surface crack, which is a tensile crack when it occurs and is correlated with the horizontal ground tensile strain. In this study, a mathematical procedure combining the horizontal displacement, as periodically monitored by total station and GPS, multiquadric radial basis function (MQ-RBF) interpolation, and continuum mechanics is provided to calculate the strain state at any point on the ground. Then the relationship between a new tensile crack and horizontal ground tensile strain is studied to determine the criterion representing the presence of a new tensile crack. This means that, when the criterion at any point on the ground is satisfied, the point will have the potential to crack. Based on this, the potential discontinuous deformation zone where surface cracks may occur can be identified, potential break angles at representative sections can then be determined. A case study is presented to illustrate the results given by the above methodology. The result shows that when major principal horizontal ground strain epsilon(1) at any point on the ground reaches the potential cracking major principal strain, PCMPS (6 mm/m in this case study), the point will have the potential to crack. Subsequently, the area within the outermost contour of the PCMPS can be defined as the potential discontinuous deformation zone. Moreover, the approximate matching of the limits of potential discontinuous deformation zones and surface cracks verifies the reliability of the mathematical procedure and the rationality of the PCMPS in identifying the discontinuous deformation zone. Additionally, in this case study, the potential break angles at two respective sections are significantly different, indicating that the break angles should be further studied and care taken in design of works in these two zones, respectively.
资助项目	National Natural Science Foundation of China (NSFC)[42002292]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000597310200015
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/25366]
专题	中科院武汉岩土力学所
作者单位	1.Hubei Univ Technol, Sch Civil Engn Architecture & Environm, Wuhan 430068, Hubei, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Pang, Hansong,Chen, Congxin,Xia, Kaizong,et al. A methodology based on strain analysis for identifying potential discontinuous deformation zones in sublevel caving mines[J]. ENGINEERING GEOLOGY,2020,279(-):16.
APA	Pang, Hansong,Chen, Congxin,Xia, Kaizong,Deng, Yangyang,Zhang, Chuqiang,&Sun, Chaoyi.(2020).A methodology based on strain analysis for identifying potential discontinuous deformation zones in sublevel caving mines.ENGINEERING GEOLOGY,279(-),16.
MLA	Pang, Hansong,et al."A methodology based on strain analysis for identifying potential discontinuous deformation zones in sublevel caving mines".ENGINEERING GEOLOGY 279.-(2020):16.