Abstract
Square confined concrete arch is increasingly used in deep soft rock roadway support because of its advantages of high strength and construction convenience. However, the design of confined concrete arch in underground engineering still remains in experience-based method and lacks quantitative analysis. As a connecting component between arch sections, the connection joints have an important influence on the internal force distribution and failure mechanism of support arch. Therefore, a reasonable design of arch joints is the premise of rational support design. Taking Liangjia Coal Mine, a typical deep soft rock mine in China, as research background, this paper fully compared the most widely used joint types of confined concrete arch as analytical objects: flange joints and casing joints. The main failure modes of these two kinds of joints under bending moment are defined. Laboratory and numerical tests are carried out to study the mechanical characteristics of joints. Based on the M–θ curve, the influence law of different design parameters is analyzed, and the design principles of joints are proposed. The research results could provide a theoretical basis for the design and application of confined concrete arch in related projects.
Highlights
Under the background of rapid development of global underground engineering construction, the scale of underground engineering in mining, transportation and other fields continues to increase
Square confined concrete arch is increasingly used in deep soft rock roadway support because of its advantages of high strength and construction convenience
The design of confined concrete arch in underground engineering still remains in experience-based method and lacks quantitative analysis
Summary
Under the background of rapid development of global underground engineering construction, the scale of underground engineering in mining, transportation and other fields continues to increase. Key Laboratory for Geo-mechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, China. Different joint types have different stiffness and bearing capacity, which directly affect the distribution of internal force and the integral resistance of arch. In the field of ground engineering, flange joints are most widely used and become the focus of related research fields (Mirza and Uy 2010; Shi et al 2007). In the field of underground engineering, the most commonly used joints in coal mines are flange joints and casing joints (Fig. 2). Wang et al (2017) has studied the mechanical properties of quantitative yielding joint of confined concrete arch. Li et al (2018) has studied the mechanical properties of confined concrete casing joints. There’s no comparative analysis of the most commonly used types of joints at present, and the joint design of confined concrete arch lacks rational design reference
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