Rock Cracking Indices for Improved Tunnel Support Design: A Case Study for Columnar Jointed Rock Masses

2016 ◽  
Vol 49 (6) ◽  
pp. 2115-2130 ◽  
Author(s):  
Xia-Ting Feng ◽  
Xian-Jie Hao ◽  
Quan Jiang ◽  
Shao-jun Li ◽  
John A. Hudson
Keyword(s):  
Jointed Rock ◽  
Rock Masses ◽  
Support Design ◽  
Tunnel Support ◽  
Jointed Rock Masses ◽  
Rock Cracking

scholarly journals Designing Tunnel Support in Jointed Rock Masses Via the DEM

2014 ◽  
Vol 48 (2) ◽  
pp. 603-632 ◽  
Author(s):  
C. W. Boon ◽  
G. T. Houlsby ◽  
S. Utili
Keyword(s):  
Jointed Rock ◽  
Rock Masses ◽  
Tunnel Support ◽  
Jointed Rock Masses

Crack Propagation of Jointed Rock and Application

2014 ◽  
Vol 651-653 ◽  
pp. 1143-1146
Author(s):  
Qing Han Wang ◽  
Shu Cai Li ◽  
Li Ping Li ◽  
Jing Wang ◽  
Qian Zhang
Keyword(s):  
Test Specimen ◽  
Strain Curve ◽  
Jointed Rock ◽  
Strength Properties ◽  
Rock Masses ◽  
Destruction Process ◽  
Stress Strain Curve ◽  
Jointed Rock Masses ◽  
Modeling Experiment

The excavation engineering in jointed rock masses, due to the changes in its original stress state, the preexisting fissures will expand and new fissures may emerge, which will degrade its mechanical and strength properties. This paper uses the DDARF method to preinstall fissures of different numbers and spacing in the rock block, then studies the crack initiation, expansion, transfixion and the destruction process by numerical modeling experiment, and finds the relevant stress strain curve. It also studies the influence of the numbers of fissures and different spacing and the influence of lateral compression on the test specimen to find the strength envelope of the test specimen. The parameters are applied in a case study. The differences in the failure behaviors of the intact and jointed rock masses after cavern excavation are analyzed and compared.

Crack Propagation of Jointed Rock and Application

2011 ◽  
Vol 117-119 ◽  
pp. 476-479
Author(s):  
Jing Wang ◽  
Wei Shen Zhu ◽  
Hai Ping Ma
Keyword(s):  
Mechanical Properties ◽  
Rock Mass ◽  
Crack Initiation ◽  
Crack Propagation ◽  
Failure Process ◽  
Jointed Rock ◽  
Rock Masses ◽  
Stress Strain ◽  
Jointed Rock Masses

Brittle media, such as rock mass, usually contain a great number of joints or cracks, which lead to varying mechanical properties and failure behaviors of different rock masses. In this paper, the DDARF method is adopted to simulate the crack initiation, propagation, coalescence and failure process in rock masses prefabricated with the different crack number and spacing under loading. The corresponding stress-strain curves and strength envelope are obtained. The parameters are applied in a case study. The differences in the failure behaviors of the intact and jointed rock masses after cavern excavation are analyzed and compared.

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