Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
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引用次数: 0

Abstract

In geotechnical engineering, activities such as landslides, rockfalls, blasting, and excavation often subject jointed rock masses to dynamic shear loads, impacting project stability. With continuous innovation of anchoring support technology, the appearance of energy-absorbing bolts has provided more options for rock support. This study selected fully-grouted bolts and energy-absorbing bolts, considering the roughness of natural rock joints. Indoor shear tests were conducted on bolted specimens at varying shear velocities. A comprehensive analysis was conducted on the failure morphology of joint surfaces and the fracture characteristics of bolts. Subsequently, the shear performance of both bolt types was quantitatively assessed through absorbed shear energy. At the interface between fully-grouted bolts and joint surfaces, stress concentration phenomena were observed. In contrast, energy-absorbing bolts exhibited significant necking phenomena. Under external forces, the bolt body detached from the grout, enabling it to accommodate large deformations of the rock mass and absorb energy. The results indicate that energy-absorbing bolts demonstrate better adaptability and energy absorption capacity under high-velocity shearing, while fully-grouted bolts exhibit higher peak shear stresses. Based on the experimental findings, for projects requiring consideration of dynamic shear loads and energy absorption capabilities, energy-absorbing bolts may be more suitable, providing additional safety assurance. Conversely, fully-grouted bolts may be more appropriate for applications with higher requirements for shear resistance, such as structural support under general static loads.

洞察螺栓连接岩石接头的速度剪切特性:全灌浆螺栓和吸能螺栓的比较研究
在岩土工程中,滑坡、落石、爆破和挖掘等活动经常会使节理岩体承受动态剪切荷载,从而影响工程的稳定性。随着锚固支护技术的不断创新,吸能螺栓的出现为岩石支护提供了更多选择。考虑到天然岩石节理的粗糙度,本研究选择了全灌浆螺栓和吸能螺栓。在不同剪切速度下对螺栓试样进行了室内剪切试验。对接合面的破坏形态和螺栓的断裂特性进行了综合分析。随后,通过吸收的剪切能量对两种类型螺栓的剪切性能进行了定量评估。在全灌浆螺栓和接合面之间的界面上,观察到了应力集中现象。相反,吸能螺栓则表现出明显的缩颈现象。在外力作用下,螺栓体脱离灌浆,使其能够适应岩体的大变形并吸收能量。结果表明,吸能螺栓在高速剪切下具有更好的适应性和能量吸收能力,而全灌浆螺栓则表现出更高的峰值剪应力。根据实验结果,对于需要考虑动态剪切载荷和能量吸收能力的项目,吸能螺栓可能更适合,可提供额外的安全保证。相反,全灌浆螺栓可能更适用于对抗剪能力要求较高的应用,如一般静态载荷下的结构支撑。
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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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