Fracture characteristics and mechanical behavior of sandstone containing a crack at the end surface under true triaxial stress condition with a free face

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Honggang Zhao, Changbao Jiang, Gun Huang, Dongming Zhang, Hongyun Yang
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引用次数: 0

Abstract

After tunnel excavation, inherent cracks within rock masses may be exposed at the free surface of the tunnel, which are referred to as end cracks. Crack growth from the end crack occurs much more easily than that from a crack inside the rock mass. This study conducted compression experiments under true triaxial stress condition, along with numerical simulations, to explore the failure characteristics and mechanical behavior of surrounding rocks containing end cracks near the free surface of the tunnel. The results reveal that compared with the inclination angle of the end crack, the failure pattern of rock is significantly affected by the end crack length. As the end crack length increases, the failure pattern of rock gradually transitions from the mixed tensile-shear fracture to the shear fracture. The peak strength of rock initially decreases and then increases as the end crack length increases. While, the peak strength of rock basically remains unchanged with the increase of the inclination angle, suggesting that the capacity of surrounding rocks containing end cracks near the free surface is primarily influenced by the end crack length. Based on the failure characteristics of surrounding rocks containing end cracks, as obtained from numerical simulations, the support measure of “grouting consolidation + local priority strengthening support” was proposed. The results indicate that the support measure can effectively restrain crack propagation and improve the capacity of surrounding rocks containing end cracks near the free surface.

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来源期刊
Bulletin of Engineering Geology and the Environment
Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合
CiteScore
7.10
自引率
11.90%
发文量
445
审稿时长
4.1 months
期刊介绍: Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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