Analysis of the deformation and fracture of underground mine roadway by joint rock mass numerical model
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ISMSSE 2018
Analysis of the deformation and fracture of underground mine roadway by joint rock mass numerical model Aibing Jin 1 & Benxin Wang 1 & Yiqing Zhao 1 & He Wang 2 & He Feng 1 & Hao Sun 1 & Zhenwei Yang 3 Received: 24 March 2019 / Accepted: 27 August 2019 # Saudi Society for Geosciences 2019
Abstract Joints in the rock mass and rheological properties are the main contributing factors in many engineering disasters. Using the userdefined visco-elastoplastic Nishihara constitutive model based on Particle Flow Code in three dimensions (PFC3D), a jointed rock mass numerical model was built to analyze rheological properties and failure behavior of a tunnel surrounded by jointed rock mass of the Zhangjiawa iron mine, Shandong Province, China. The joint distribution law was determined from a statistical analysis of joints on the tunnel walls. Based on the tunnel joint network constructed by the Monte-Carlo method, a jointed rock mass numerical model was established. The rheological properties of the jointed rock mass were separately analyzed by the Nishihara model and the linear elastic model. According to the result from the linear elastic model, the deformation of the tunnel roof and sides did not change with time and the model did not exhibit rheological properties. In contrast, the result of the userdefined Nishihara model showed obvious creep property. The bonds of the joint faces in the jointed rock mass model were primarily destroyed by shear failure. The failure modes and deformation data for the tunnel were generally consistent with field monitoring data. Keywords Particle Flow Code . Nishihara model . Jointed rock mass numerical model . Rheological properties . Roadway deformation and fracture
Introduction As a common geological body in geotechnical engineering, rock mass has many joint fissures and special rheological properties. Many rock engineering disasters have been due to the existence of joints and rheological properties. Therefore, it is vital to research the rheological properties of jointed rock mass.
This article is part of the Topical Collection on Mine Safety Science and Engineering * Yiqing Zhao [email protected] 1
Ministry of Education Key Laboratory of High Efficiency Mining and Safety for Metal Mines & School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Beijing General Research Institute of Mining and Metallurgy Technology Group, Beijing 102628, China
3
China Railway Fifth Survey and Design Institute Group, Beijing 102600, China
Rheological properties of rock have an obvious impact on geotechnical engineering projects involving large depth, long service life, and soft rock. Under high geostress, deep roadways in underground mines are vulnerable to rheological damage. Wang and Wang (2012) showed that creeping of surrounding rock was the main cause of deformation and failure in soft rock under deep roadways. At present, there have been a number of advances in theoretical and experimental research on the rheological prop
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