Study on bearing characteristic of rock mass with different structures: Physical modeling

Zhenlong Zhao, Hongwen Jing, Xinshuai Shi, Lijun Yang, Qian Yin and Yuan Gao

Abstract

In this paper, to study the stability of surrounding rock during roadway excavation in different rock mass structures, the physical model test for roadway excavation process in three types of intact rock mass, layered rock mass and massive rock mass were carried out by using the self-developed two-dimensional simulation testing system of complex underground engineering. Firstly, based on the engineering background of a deep mine in eastern China, the similar materials of the most appropriate ratio in line with the similarity theory were tested, compared and determined. Then, the physical models of four different schemes with 1000 mm (height) x1000 mm (length)x 250 mm (width) were constructed. Finally, the roadway excavation was carried out after applying boundary conditions to the physical model by the simulation testing system. The results indicate that the supporting effect of rockbolts has a great influence on the shallow surrounding rock, and the rock mass structure can affect the overall stability of the surrounding rock. Furthermore, the failure mechanism and bearing capacity of surrounding rock were further discussed from the comparison of stress evolution characteristics, distribution of stress arch, and failure modes in different schemes.

Key Words

physical model; rock mass structure; stress evolution; mechanical bearing characteristic; failure mechanism

Address

Zhenlong Zhao, Hongwen Jing, Lijun Yang and Qian Yin: State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, P.R. China Xinshuai Shi: 1.) State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, P.R. China 2.) Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo, Nagasaki 852-8521, Japan Yuan Gao: 1.) State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, P.R. China 2.) Department of Civil Engineering, Monash University, Clayton, Victoria 3800, Australia

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