Stress initialization methods for dynamic numerical simulation of rock mass with high in-situ stress
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Stress initialization methods for dynamic numerical simulation of rock mass with high in-situ stress YANG Jia-cai(杨家彩)1, LIU Ke-wei(刘科伟)1, 2, LI Xu-dong(李旭东)1, LIU Zhi-xiang(刘志祥)1 1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China; 2. School of Civil and Resource Engineering, The University of Western Australia, Perth, Australia © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: In the context of deep rock engineering, the in-situ stress state is of major importance as it plays an important role in rock dynamic response behavior. Thus, stress initialization becomes crucial and is the first step for the dynamic response simulation of rock mass in a high in-situ stress field. In this paper, stress initialization methods, including their principles and operating procedures for reproducing steady in-situ stress state in LS-DYNA, are first introduced. Then the most popular four methods, i.e., explicit dynamic relaxation (DR) method, implicit-explicit sequence method, Dynain file method and quasi-static method, are exemplified through a case analysis by using the RHT and plastic hardening rock material models to simulate rock blasting under in-situ stress condition. Based on the simulations, it is concluded that the stress initialization results obtained by implicit-explicit sequence method and dynain file method are closely related to the rock material model, and the explicit DR method has an obvious advantage in solution time when compared to other methods. Besides that, it is recommended to adopt two separate analyses for the whole numerical simulation of rock mass under the combined action of in-situ stress and dynamic disturbance. Key words: in-situ stress; stress initialization method; dynamic disturbance; numerical simulation; rock mass Cite this article as: YANG Jia-cai, LIU Ke-wei, LI Xu-dong, LIU Zhi-xiang. Stress initialization methods for dynamic numerical simulation of rock mass with high in-situ stress [J]. Journal of Central South University, 2020, 27(10): 3149−3162. DOI: https://doi.org/10.1007/s11771-020-4535-3.
1 Introduction With the area spread of human activities and the demand increase for economic development, many underground excavations are being carried out in deeper areas. Taking underground mining as an example, many gold mines in South Africa have entered into ultra-deep levels with the deepest mining level in the world more than 4000 m, and the deepest mines in Australia and Canada also have reached 1900 m and 3000 m, respectively [1, 2]. Statistically, in China, more than 50 metal mines will be mined to a depth of 1000 m in recent
five years, nearly half of which will be mined to a depth of 1500 m in the next 10 to 20 years. Up to now, more than 100 mines with a depth of over 1000 m around the world have been developed and the number keeps increasing. In deep level, the rock mass or geological structure is inevitably subjected to high in-situ stress and the mechanical behaviors of rock mass a
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