Numerical investigation on the stability of deforming fractured rocks using discrete fracture networks: a case study of underground excavation

doi:10.1007/s10064-019-01536-9

	Numerical investigation on the stability of deforming fractured rocks using discrete fracture networks: a case study of underground excavation
	Wang, Luyu 3,4; Chen, Weizhong 2,4; Tan, Xuyan 3,4; Tan, Xianjun 4; Yang, Jianping 4; Yang, Diansen 4; Zhang, Xi 1
刊名	BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
	2020
卷号	79 期号:1 页码:133-151
关键词	Fractured rocks Discrete fractures Underground excavation Stability analysis Hybrid finite element method
ISSN号	1435-9529
DOI	10.1007/s10064-019-01536-9
英文摘要	The stability of a fractured rock mass around a subsurface opening is critical to tunnel excavation. The traditional underground excavation analysis is based on a continuum description of randomly distributed discrete pre-existing fractures. In contrast to this, we have developed an improved hybrid finite element method (FEM) to investigate the stability of fractured rocks around an excavation by incorporating the outputs into the FEM codes. The proposed model consists of a discrete fracture network (DFN) model and cohesive zone model (CZM). The DFN model automatically generates a fracture network with a given fracture opening distribution and provides grid generation strategy to the FEM. The CZM captures material failure and intersection and surface contacts through the fracture element with different constitutive laws. As a case study, a DFN model was formulated for the underground excavation at Jinping Hydropower Station, in light of the input requirements of our model, and its deformation analysis was performed. The comparison analysis of rock deformation was made for excavation in both intact rock mass and fractured rock mass under the same boundary conditions. The numerical results show that two different modes of rock failure exist in these two rock masses and that intense deformation at the fractures intersected by the tunnel is responsible for fractured rock mass instability. The proposed approach was verified using data from field investigations. A larger displacement can be produced if the rock mass is weakened by a key block. A sensitivity analysis was carried out to investigate the effects of different model parameters on deformation variations. This study provides an insightful understanding of the deformation of fractured rock mass during tunnel excavation.
资助项目	Chinese Fundamental Research (973) Program[2015CB057906]
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000511500900010
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/23471]
专题	中科院武汉岩土力学所
通讯作者	Chen, Weizhong
作者单位	1.CSIRO Energy, Clayton, Vic 3168, Australia 2.Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan 250100, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Wang, Luyu,Chen, Weizhong,Tan, Xuyan,et al. Numerical investigation on the stability of deforming fractured rocks using discrete fracture networks: a case study of underground excavation[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2020,79(1):133-151.
APA	Wang, Luyu.,Chen, Weizhong.,Tan, Xuyan.,Tan, Xianjun.,Yang, Jianping.,...&Zhang, Xi.(2020).Numerical investigation on the stability of deforming fractured rocks using discrete fracture networks: a case study of underground excavation.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,79(1),133-151.
MLA	Wang, Luyu,et al."Numerical investigation on the stability of deforming fractured rocks using discrete fracture networks: a case study of underground excavation".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 79.1(2020):133-151.