A comprehensive review of experimental studies on shear behavior of bolted rock joints with varying rock joint and bolt parameters and normal stress
Chang Zhou, Zhenwei Lang, Shun Huang, Qinghong Dong, Yanzhi Wang, Wenbo Zheng
深部工程中，锚固岩体节理的剪切特性对隧道和矿井稳定性至关重要。本文综述了最新研究，展示了锚固节理抗剪强度与法向应力、岩石强度正相关，受节理粗糙系数(JRC)显著影响，并构建了描述三者关系的数学模型。研究指出，法向应力影响锚杆变形和承载力，小角度锚杆表现更佳。这些发现为剪切设备设计及工程安全提供了理论支持。
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Chang Zhou, Zhenwei Lang, Shun Huang, Qinghong Dong, Yanzhi Wang, Wenbo Zheng. A comprehensive review of experimental studies on shear behavior of bolted rock joints with varying rock joint and bolt parameters and normal stress. Deep Underground Science and Engineering. 2024; 1-21. doi:10.1002/dug2.12091
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01
本文简介：
锚固岩体节理的剪切特性对隧道掘进和采矿的稳定性至关重要，特别是在深部地下工程中，锚固材料会受到高应力、水压和工程扰动的影响。然而，由于锚固岩体节理与各种地质环境之间的复杂相互作用，存在许多挑战和尚未解决的问题。因此，在深部地下工程领域，对锚固节理面抗剪性能的研究还有待进一步深入。本文对不同剪切条件下锚杆锚固响应的研究成果进行了综述。结果表明，锚固节理的平均抗剪强度随法向应力的增大而线性增大，随岩石抗压强度的增大而增大，直至达到一个稳定值。节理粗糙系数(JRC)影响锚固岩体节理的接触面积、摩擦力、抗剪强度、弯曲角和轴向力。提出了一个数学函数来模拟JRC、法向荷载和抗剪强度之间的关系。法向应力水平也会影响锚固岩体节理内锚杆的变形模式、承载能力和能量吸收比，并可以用两相指数方程有效地表征。此外，锚杆角度影响锚杆抗拉与抗剪强度之比，以及锚固岩体节理与围岩的力学行为，锚杆角度越小越有利。本文对锚固岩石节理剪切行为的实验数据进行了全面的回顾，为开发先进的剪切装置和进一步的相关研究提供了有价值的理论见解。
Brief Introduction：
The shear characteristics of bolted rock joints are crucial for the stability of tunneling and mining, particularly in deep underground engineering, where rock bolt materials are exposed to high stress, water pressure, and engineering disturbance. However, due to the complex interaction between bolted rock joints and various geological contexts, many challenges and unsolved problems arise. Therefore, more investigation is needed to understand the shear performance of bolted joints in the field of deep underground engineering. This study presents a comprehensive review of research findings on the responses of bolted joints subjected to shearing under different conditions. As is revealed, the average shear strength of bolted rock joints increases linearly with the normal stress and increases with the compressive strength of rock until it reaches a stable value. The joint roughness coefficient (JRC) affects the contact area, friction force, shear strength, bending angle, and axial force of bolted rock joints. A mathematical function is proposed to model the relationship between JRC, normal load, and shear strength. The normal stress level also influences the deformation model, load‐carrying capacity, and energy absorption ratio of bolts within bolted rock joints, and can be effectively characterized by a two‐phase exponential equation. Additionally, the angle of the bolts affects the ratio of tensile and shear strength of the bolts, as well as the mechanical behavior of both bolted rock joints and surrounding rock, which favors smaller angles. This comprehensive review of experimental data on the shear behavior of bolted rock joints offers valuable theoretical insights for the development of advanced shear devices and further pertinent investigations.
02
本文亮点：
提出了用于锚固岩石节理抗剪强度的线性和函数模型，并考虑了粗糙度和法向应力。
使用两相方程模拟锚杆在正应力条件下的变形和承载力。。
通过数学模型证明了抗剪强度与锚固角的非线性关系。。
岩石强度和节理粗糙度使锚固岩石节理更加脆弱。
Highlights：
Proposes linear and functional models for shear strength of bolted rock joints and roughness, normal stress.
Models the bolt deformation and capacity with normal stress using a two‐phase equation.
Demonstrate the nonlinearity of the shear strength as a function of the bolted angle by a mathematical model.
Rock strength and joint roughness make bolted rock joint more brittle.
03
通讯作者简介：
郑文博
郑文博，加拿大北英属哥伦比亚大学岩土工程助理教授。在不列颠哥伦比亚大学获得博士学位。他的研究兴趣在于地质力学，该理论应用于广泛的地质资源和地质灾害问题，包括页岩气开采中的砂支撑剂破碎/嵌入、边坡稳定性/滑坡和隧道掘进。他目前的研究重点是将先进的实验室表征和现场监测数据与计算地质力学相结合，以了解地质材料的基本行为及其对工程应用的影响。
第一作者简介：
周昌
周昌，副教授，硕士生导师，来自中国矿业大学。他在中国地质大学(武汉)获得博士学位。主要从事地质灾害防治机理研究，参与钙钛矿量子点薄膜传感器的研究与开发，岩土工程阻力理论研究。发表论文30余篇，申请发明专利20余项。
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