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RISS 인기검색어
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- 저자 : Junyang Teng (검색결과 2 건)
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CT Experimental Study on the Damage Characteristics of Anchored Layered Rocks
Junyang Teng,Jianxin Tang,Yuning Zhang,Xinyi Li 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.9
A laboratory physical simulation and a CT scan test were conducted to analyze the anchoring mechanism of a system anchor bolt and a steel floral pipe in a layered rock mass. The following conclusions were drawn: (1) The anchoring effect of the system anchor bolt and steel floral pipe improves the strength parameter of the layered rock, and the system anchor bolt provides higher improvement. Neglecting the jointing effect, the improvement in the strength parameter of the layered rock due to the anchor bolt is primarily reflected by the following three aspects: the compressive zone effect of the preload, the repairing effect of the anchoring agent on defects in country rocks, and the reinforcement effect of the anchor bolt on the overall strength and density of the anchoring object. Considering the jointing effect, the improvement in the strength parameter of the layered rock due to the anchor bolt is reflected by improvement in the deformability and shear strength of the joint surface. (2) The stress-strain curves of the anchored specimens can be divided into different stages of damage evolution, based on the angles of bedding. (3) The crack-arresting effect of the anchor bolt is due to the weakening, cutting, and arresting of the cracks in the anchorage zone. The larger the anchorage zone, the better is the crack-arresting effect.
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3DEC Numerical Analysis of Failure Characteristics for Tunnel in Stratified Rock Masses
Yulong Chen,Junyang Teng 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.6
3DEC is used herein to study the stability of a circular tunnel opening in stratified rock mass. Numerical analysis indicated that the bedding planes can influence the damage process and the distribution of secondary cracks in rock masses, creating more damaged zones. The bedding planes lead to a nonuniform distribution of water pressure behind the lining. Such nonuniform water pressure may result in localized damage in the tunnel. Water leakage occurs mainly at the top of the tunnel and on both side of the walls. Tunnels situated in vertical bedding planes are more vulnerable to water, especially for underwater projects such as water diversion tunnels and undersea tunnels, where construction in vertical bedding planes should be avoided as much as possible. The maximum deformation of shotcrete occurs at the intersection with the bedding plane, and the displacement on the upper side is greater than that on the lower side.
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