Article
Engineering, Multidisciplinary
Jinfeng Zou, Penghao Zhang
Summary: This study proposes a comprehensive model to predict the yield and failure patterns of rock bolts, highlighting the decoupling between the bolt and grout, as well as the yield and failure patterns of two potential points along the bolt through a combination of analytical and numerical methods.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Engineering, Geological
Naotoshi Yasuda
Summary: This study aims to derive a simplified Winkler model for the ground support provided by a bolt, with the mutual interaction between the bolt and the surrounding ground analytically evaluated.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Construction & Building Technology
Nie Wen, Yong Zhaorui, Guo Wei, Chen Yun, Fan Lifeng, Wang Jiong
Summary: This paper analyzes the time-dependent reinforcement provided by the energy-absorbing bolt based on the reinforced rock unit (RRU) model. The energy-absorbing bolt is simulated using an ideal elastic-plastic material law, represented by a connection of a Hookean elastic element and a Saint Venant element in series. The constitutive models and creep behavior of the RRU are obtained assuming the rock is a general Kelvin material. The study applies the constitutive models of RRU to predict the convergence of surrounding rock mass in a mining roadway in Anhui province, China, and achieves good agreement between analytical solutions and field-monitored data.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Tao Xiao, Pengpeng Ni, Zheng Chen, Jianxue Feng, Deqiang Chen, Guoxiong Mei
Summary: This paper aims to optimize the drainage holes for permeable pile by introducing a scheme of local pervious segment, which accelerates the dissipation of excess pore water pressure caused by pile driving. An axisymmetric consolidation model is established for a single local permeable pile in saturated clay and a semi-analytical solution is obtained using the boundary transform and integral transform methods. The effectiveness of the proposed solution is assessed by comparing with degradation analysis, finite difference analysis, and model test. Results show that the local permeable pile can accelerate soil consolidation, especially in the early stage, and the acceleration effect becomes more apparent with increased pervious segment length and position, pile aspect ratio, and soil permeability coefficient ratio.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Geochemistry & Geophysics
Kai Wang, Bao-gui Yang, Zhong-kui Wang, Xiao-long Wang
Summary: This paper addresses the support design of layered roof strata in coal roadways, establishing a simplified analytical model based on the theory of elastic foundation beam and key stratum. Failure criteria are proposed and the failure range and supporting parameters are calculated.
Article
Engineering, Geological
Weiteng Li, Xiuming Li, Yuchun Mei, Gang Wang, Wendong Yang, Hongtao Wang
Summary: This paper presents the mechanical models and numerical simulation methods for energy-absorbing anchor bolts in practical engineering applications. Based on laboratory test results, criteria for energy absorption and breakage are defined, and mechanical models for five different types of energy-absorbing anchor bolts are developed. Numerical simulations demonstrate the effectiveness of these models and their ability to simulate the support of deep coal mine roadways.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Multidisciplinary Sciences
Quanwei Liu, Yongshun Li, Weiteng Li, Jizeng Zhao, Zhe Qin, Xuxu Yang, Qiang Feng, Bei Jiang, Ke Wang, Yang Li
Summary: This article proposes a high prestressed rock bolt support system for large-span underground excavation subway stations based on the active support concept. Numerical calculations and field monitoring are performed to analyze and evaluate the new support system, which has been proven to be safe and reasonable.
SCIENTIFIC REPORTS
(2022)
Article
Mining & Mineral Processing
Junbao Wang, Wei Liu, Zhanping Song, Lingfeng Li, Shijin Feng, Yun Cheng
Summary: A new energy-absorbing bolt has been developed to control the large deformation of tunnel surrounding rock. The bolt can transform into a rigid support to prevent further deformation of the surrounding rock. The study investigates the working performance and influencing factors of the bolt through static tensile tests and numerical simulations.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
Article
Geochemistry & Geophysics
Wei Yongke, Guo Hongyan, Hu Juyi, Liu Jiaqing, Liu Limin
Summary: This study aimed at the problem of uneven deformation of the tunnel surrounding rock in deep inclined rock strata and proposed an innovative balanced-yielding support technology. Through mechanism analysis and design of implementing steps, optimal design parameters were obtained to form a balanced-yielding support system. Engineering application results showed that the system effectively reduced tunnel deformation.
Article
Engineering, Geological
Haohua Chen, Hehua Zhu, Lianyang Zhang
Summary: This study introduces a new semi-analytical solution for the ultimate end-bearing capacity of rock-socketed shafts, taking into account the effects of 3D strength and geometry. The results indicate that neglecting 3D strength and geometry can significantly underestimate the ultimate end-bearing capacity.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Changyi Yang, Jingpei Li, Lin Li, De'an Sun
Summary: This paper presents a semi-analytical elastoplastic solution for cylindrical cavity expansion in overconsolidated unsaturated soils under constant water content condition. The unified hardening model for OC unsaturated soil is coupled with a void ratio-dependent soil-water characteristic curve to model the soil responses. Parametric studies show that both the overconsolidation ratio and the suction have remarkable impacts on the expansion responses.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Civil
Ratan Das, Trilok Nath Singh
Summary: A parametric study was conducted to investigate the influence of different bolt parameters on maximum induced boundary displacements in jointed rockmass. It was found that increasing the bolt diameter substantially reduced the tunnel boundary displacement, while increasing bolt length did not significantly affect the boundary displacement for the same rockmass properties.
Article
Metallurgy & Metallurgical Engineering
Zhao Tong-bin, Xing Ming-lu, Guo Wei-yao, Wang Cun-wen, Wang Bo
Summary: The research found that during the structural deformation stage of large deformation bolts, the drawing force, bolt axial force, and interfacial shear stress remain stable; when the structural elements of the large deformation bolt approach the drawing end, the fluctuation range of the drawing force decreases, which is advantageous for maintaining the stress stability of the anchorage body.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Computer Science, Interdisciplinary Applications
Yingming Xiao, Manchao He, Yafei Qiao, Menglong Peng, Hongru Li, Tai Cheng
Summary: The nonlinearity of rock becomes more significant as the buried depth increases, affecting stress redistribution and deformation patterns during tunneling. A newly proposed UHS model and the finite difference method are used to obtain a semi-analytic solution that accurately calculates the plastic internal variable and stress state in the plastic zone, without stress vibration in the strain-hardening zone. The model is validated and the effects of strain-hardening, strain-softening, and prestress on ground reactions are highlighted.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Engineering, Environmental
Masoud Ranjbarnia, Mir Mahdi Rashedi, Daniel Dias
Summary: This paper investigates the performance of pre-tensioned grouted rockbolts in bedding rock slopes. By analyzing the contribution of axial and shear forces to prevent rock layer sliding, and studying the effects of pre-tension, joint roughness, bolt inclination, and rock strength on bolt performance, the important role of pre-tensioned grouted rockbolts in improving slope stability is revealed.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)