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Geomechanics and Engineering
  Volume 22, Number 6, September25 2020 , pages 529-540
DOI: https://doi.org/10.12989/gae.2020.22.6.529
 


Modelling the coupled fracture propagation and fluid flow in jointed rock mass using FRACOD
Shichuan Zhang, Baotang Shen, Xinguo Zhang, Yangyang Li, Wenbin Sun and Jinhai Zhao

 
Abstract
    Water inrush is a major hazard for mining and excavation in deep coal seams or rock masses. It can be attributed to the coalescence of rock fractures in rock mass due to the interaction of fractures, hydraulic flow and stress field. One of the key technical challenges is to understand the course and mechanism of fluid flows in rock joint networks and fracture propagation and hence to take measures to prevent the formation of water inrush channels caused by possible rock fracturing. Several case observations of fluid flowing in rock joint networks and coupled fracture propagation in underground coal roadways are shown in this paper. A number of numerical simulations were done using the recently developed flow coupling function in FRACOD which simulates explicitly the fracture initiation and propagation process. The study has demonstrated that the shortest path between the inlet and outlet in joint networks will become a larger fluid flow channel and those fractures nearest to the water source and the working faces become the main channel of water inrush. The fractures deeper into the rib are mostly caused by shearing, and slipping fractures coalesce with the joint, which connects the water source and eventually forming a water inrush channel.
 
Key Words
    jointed rock; numerical simulation; fracture interaction; water inrush; FRACOD
 
Address
Shichuan Zhang, Xinguo Zhang, Yangyang Li, Wenbin Sun and Jinhai Zhao: State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, China

Baotang Shen: 1.) State Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao, China
2.) CSIRO Energy, Queensland Centre for Advanced Technologies, PO Box 883, Kenmore, Brisbane, QLD 4069, Australia
 

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