E3S Web Conf.
Volume 276, 20212021 5th International Conference on Water Conservancy, Hydropower and Building Engineering (WCHBE 2021)
|Number of page(s)||4|
|Section||Water Conservancy and Hydropower and Natural Geological Exploration|
|Published online||23 June 2021|
Study on Formation Mechanism of Zonal Disintegration of Surrounding Rock in Deep Tunnel
1 Power China, Northwest Engineering Corporation Limited, 710065 Xi’an, Shaanxi, China
2 High Slope and Geological Hazard Research & Management Branch, National Energy and Hydropower Engineering Technology R&D Centre, 710065 Xi’an, Shaanxi, China
3 Ocean University of China, 266100, Qingdao, Shandong, China
* Corresponding author: firstname.lastname@example.org
With the construction of underground rock engineering, the surrounding rock in deep tunnels appears zonal disintegration of fracture and intact zones alternate distribution, which is a special engineering geological phenomenon. This study establishes a partitioned fracture model under the coupling of high in-situ stress and osmotic pressure, and identify the key influencing factors of the fracture model. Furthermore, a stress intensity factor (SIF) of initial cracks on surrounding rock elastoplastic boundary is derived using the transformation of complex functions. Considering the high seepage pressure of the surrounding rocks, a zonal fracture initiation criterion is established combined with the analysis of redistributed stress fields. Finally, the obtained criterion is embedded into an extended finite element method (XFEM) platform for numerical simulation. Taking the maximum circumferential tensile stress as a cracking criterion, the propagation trajectory of rock cracks is traced by contour methods. Calculation results have realized the modelling of a whole process of crack initiation, propagation, and formation. And the established criterion has be verified.
© The Authors, published by EDP Sciences, 2021
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