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Anchoring mechanical characteristics of Ductile-Expansion bolt
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作者 Yu Chen Wang Liu +4 位作者 Linchong Huang Hang Lin Yixian Wang Yanlin Zhao Cungang Lin 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第8期1115-1134,共20页
The application of ductile rock bolts has been a crucial method for solving the problems of large deformations,energy absorption and stability control issues in deep rock masses.To study the anchoring mechanism of the... The application of ductile rock bolts has been a crucial method for solving the problems of large deformations,energy absorption and stability control issues in deep rock masses.To study the anchoring mechanism of the key expansive structure,this paper proposes a novel type of bolt—the Ductile-Expansion bolt,and conducts research on anchoring mechanics,energy absorption characteristics,and failure modes of the bolt.In addition,this paper defines the concept of load-volume ratio of metal rock bolts and proves the Ductile-Expansion bolt is capable of better improving the unit volume bearing capacity of the bolt material.Furthermore,laboratory and field tests verify the Ductile-Expansion bolt had better anchoring effect than the traditional rebar bolt,with the expansion structure favorably enhancing the ductility and energy absorption performance of the bolt.Finally,this paper microscopically analyzes the crack propagation and distribution morphology of the bolts by establishing a 3D coupled numerical model based on FDM-DEM.Numerical results illustrate the interface at the variable diameter of the Ductile-Expansion bolt serves as the transition zone between high and low stress levels.The expansion structure can impose radial compression on the medium around the bolt,which can improve the bolt anchorage performance. 展开更多
关键词 Ductile-Expansion bolt Pull-out test Peak load anchoring mechanical characteristics
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Effect of Surface Texture on Tensile Shear Strength of 1060Al-PET Welding Joints 被引量:1
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作者 Jia Liu Yuchi Dai +2 位作者 Yan Shi Wenfu Cui Tao Jiang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2021年第5期306-321,共16页
Joining metal to plastic can lighten weight of products to reduce energy consumption.However,it is difficult to achieve high-strength welding between metal and plastic.To address this problem,the methods of surface te... Joining metal to plastic can lighten weight of products to reduce energy consumption.However,it is difficult to achieve high-strength welding between metal and plastic.To address this problem,the methods of surface texture pretreatment and laser irradiation welding was proposed to achieve the high-strength connection of metal and plastic.In this study,with different parameters of laser power and texture morphology,1060 Al with surface texture treatment was joined to polyethylene terephthalate(PET)by laser irradiation welding from metal side.Study showed that as the laser power increased,the tensile shear strength of joints increased first,and decreased thereafter.Tensile shear tests demonstrated that the mechanical force of joint was strengthened contributed to mechanical anchorage formed by surface texture.The depth-width ratio of the texture grooves affected the tensile shear process of the joint.According to the result of temperature simulation,the existence of texture grooves reduced the heat transfer efficiency,and the heat dissipation at interface was also impeded in course of laser welding.Finally,the maximum tensile strength of 1060Al-PET joint reached 48.4 MPa,which was close to the strength of PET matrix.The bonding mechanism of the 1060Al-PET joints was composed of mechanical bonding and chemical bonding.This study proposes an effective method to join metal to plastic which achieved high-strength connection between metal and plastic. 展开更多
关键词 1060Al-PET Surface texture Tensile shear strength Depth/width ratio mechanical anchoring effect
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High-resistance controlled yielding supporting technique in deep-well oil shale roadways 被引量:3
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作者 Yu Yang Bai Jianbiao +3 位作者 Wang Xiangyu Wang Junde Xue Shizhi Xu Ke 《International Journal of Mining Science and Technology》 SCIE EI 2014年第2期229-236,共8页
In order to avoid the deep-well oil shale roadway being deformed, damaged, or difficult to maintain after excavating and supporting in Haishiwan coal mine, this paper has analyzed the characteristics of the deformed r... In order to avoid the deep-well oil shale roadway being deformed, damaged, or difficult to maintain after excavating and supporting in Haishiwan coal mine, this paper has analyzed the characteristics of the deformed roadway and revealed its failure mechanism by taking comprehensively the methods of field geological investigation, displacement monitoring of surrounding rock, rock properties and hydration properties experiments and field application tests. Based on this work, the high-resistance controlled yielding supporting principle is proposed, which is: to "resist" by high pre-tightening force and high stiff- ness in the early stage, to "yield" by making use of the controlled deformation of a yielding tube in the middle stage, and to "fix" by applying total-section Gunite in the later stage. A high-resistance controlled yielding supporting technique of "high pre-tightening force yielding anchor bolt + small-bore pre-tight- ening force anchor cable + rebar ladder beam + rhombic metal mesh + lagging gunite" has been estab- lished, and industrial on site testing implemented. The practical results show that the high-resistance controlled yielding supporting technique can effectively control the large deformation and long-time rheology of deep-well oil shale roadways and can provide beneficial references for the maintenance of other con-generic roadways.Deep-well Oil shale 展开更多
关键词 Deformation failure mechanism High-resistance controlled yielding supporting Yielding anchor bolt
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Analysis on the anchor mechanism of the full length resin bolt
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作者 宋彦波 刘洪涛 《Journal of Coal Science & Engineering(China)》 2003年第1期79-81,共3页
The purpose of this paper is to reveal the stress distribution characteristic along the full length anchor bolt. Based on the mechanic model set up, the author calculated the anchor mechanism of the full length resin ... The purpose of this paper is to reveal the stress distribution characteristic along the full length anchor bolt. Based on the mechanic model set up, the author calculated the anchor mechanism of the full length resin rock bolt. The stress distribution characteristic is different according to different type of surrounding rock. The conclusion is important to optimize the roadway bolt support design. 展开更多
关键词 anchor mechanism full length resin rock bolt stress distribution characteristic bolt support design
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