Article
Chemistry, Multidisciplinary
Yongjie Yang, Lingren Meng, Tianli Zhang
Summary: The paper focuses on the thick soft rock mass roof of the track roadway in the No. 3606 panel of the Chaili Coal Mine. A full anchor cable support scheme is proposed to maintain the integrity of the roadway roof. Support parameters and feasibility were determined through field experience and numerical simulation analyses. On-site monitoring and data analysis showed that the anchor cables and anchor bolts provided stable support for the roadway. The overall deformation of the roadway was minimal, demonstrating the effectiveness of the full anchor cable support method for thick soft rock immediate roof.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Geological
Dowon Park, Radoslaw L. Michalowski
Summary: This paper analyzes the three-dimensional stability of roofs in deep flat-ceiling cavities. The stability number, factor of safety, and required supporting stress are used to measure roof stability. The study finds that the shape of the failing block has the greatest impact on stability, with specific shapes of conical and elliptic surfaces being the most critical. The kinematic approach of limit analysis is used, with the Hoek-Brown failure criterion governing rock strength.
ENGINEERING GEOLOGY
(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
Geochemistry & Geophysics
Tong Zhao, Peilin Gong, Kaan Yetilmezsoy, Majid Bahramian, Changyou Liu, Xiaofei Gong
Summary: The study focused on fracture characteristics and instability migration laws of thick and hard roof in Zhuxianzhuang Coal Mine, proposing a coordinated control strategy involving confined blasting and support optimization. Key parameters were determined and successfully applied in a working face, achieving satisfactory results in terms of safety and economic efficiency.
Article
Energy & Fuels
Tong Zhao, Peilin Gong, Kaan Yetilmezsoy, Majid Bahramian, Changyou Liu
Summary: Research was conducted on the prevention methods of roof-control disasters in mines with thick and hard rock strata, proposing principles and methods of zonal control based on the analysis of different mining zones. A coordinated control method was applied to strong pressure behavior zones and less-strong pressure behavior zones, achieving good results in practice.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Engineering, Geological
Dowon Park
Summary: This study revisited and extended the analytical solution for tunnel roof collapse profiles, and estimated traditional stability measures for safety assessment and engineering design. Optimal bounds for stability number, shear strength-based factor of safety, and support pressure were derived from original and extended analytical expressions. The computational results were validated and showed good agreement with semi-analytical and numerical approaches. The proposed techniques enrich the existing theoretical method while maintaining extreme simplicity.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Metallurgy & Metallurgical Engineering
Shi-jie Xie, Hang Lin, Yi-fan Chen, Yi-xian Wang
Summary: The study proposed a nonlinear empirical strength criterion based on Mohr-Coulomb criterion, which was validated through triaxial test strength analysis of 11 rock materials. The prediction results obtained by applying this new criterion to 97 conventional triaxial compression tests of 11 different rock materials were highly consistent with the experimental data, providing a new reference and method for determining the triaxial compressive strength of rock materials.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2021)
Article
Construction & Building Technology
Dowon Park
Summary: The Hoek-Brown failure criterion is effective for estimating the peak strength of isotropic rocks under shear failure, but less accurate for tensile fractures. Previous studies have not considered the influence of the tension cut-off (TC) introduced by Hoek and Brown for deep excavation. In this study, a stability analysis of deep tunnel roofs was performed using the HB yield function with reduced or eliminated tensile strength, revealing a significant impact of TC on the stability of different tunnel cross-sections.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Jiandong Huang, Jia Zhang, Yuan Gao
Summary: This study aimed to predict rock joint shear strength using a combination of SVR and FA algorithms, showing that the FA algorithm effectively adjusts hyperparameters to optimize the SVR model for accurate prediction.
Article
Mining & Mineral Processing
V. Klishin, V. N. Fryanov, L. D. Pavlova, S. M. Nikitenko, Yu Malakhov
Summary: The study introduces a dedicated mobile roof support solution for underground coal mining, analyzing the joint deformation of roof rocks and roof support using the finite element method. The research highlights the impact of support on coal and host rocks, and suggests the feasibility of increasing the rate of heading by reducing the heading cycle duration.
JOURNAL OF MINING SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Xingdong Zhao, Nan Zeng, Lei Deng, Qiankun Zhu, Yifan Zhao, Shanghuan Yang
Summary: This study provides a systematic support design method for deep hard-rock drifts in the Sanshandao Gold Mine in China. Through field investigations and laboratory studies, the properties of the rock masses along the drifts were analyzed, and an updated combined support system was proposed. Numerical methods were used to confirm the effectiveness of the support systems.
APPLIED SCIENCES-BASEL
(2022)
Article
Metallurgy & Metallurgical Engineering
Avinash Paul, V. M. S. R. Murthy, Amar Prakash, Ajoy Kumar Singh, John Loui Porathur
Summary: In this research, 31 cases of rock load were determined under different geo-mining conditions using CMRI-ISM RMR. A modified Rock Mass Rating dynamic (RMRdyn) incorporating P-wave velocity as a new parameter was developed and compared with numerical modeling. The results showed that RMRdyn and numerical modeling had smaller deviation compared to CMRI-ISM RMR.
MINING METALLURGY & EXPLORATION
(2023)
Article
Construction & Building Technology
Lun Gong, Jiaqi Feng, Ping Zhou, Dishuang Sun, Feicong Zhou, Hui Hu, Lichuan Wang
Summary: This paper investigates the bearing failure characteristics and support parameters of pipe roof support in super shallow buried double track railway tunnel crossing soft surrounding rock through theoretical analysis, laboratory tests, and numerical simulation. Based on the analysis of load and load range, the mechanical analysis model of the pipe roof is selected. Laboratory tests are conducted to analyze the influence of pipe diameter, wall thickness, grouting fullness, and reinforcement cage measures on the bearing capacity of pipe roof grouting steel pipes. The results are compared with numerical simulations for verification, leading to the conclusion that a fully grouted steel pipe with a wall thickness of 4 mm and a diameter of 108 mm without reinforcement cage can meet the support capacity requirements for most super shallow buried double track railway tunnels crossing soft surrounding rock.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Chen Xu, Caichu Xia, Shigui Du
Summary: The translation discusses yielding-resistance combination support in squeezing tunnels and proposes a simplified two-stage calculation method to derive time-dependent rock stresses and displacements based on different stress paths. It emphasizes the importance of considering the stress path in estimating rock deformability and displacement accurately. The key parameters for tunnel support design in squeezing rocks are identified, including the duration of the first stage, deformation at the first stage, primary support pressure, and allowable displacement rate. The suggestion to minimize the duration of the first stage if a relatively low value of the allowable displacement rate is ensured to balance stability and construction cost.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Ecology
Tingchun Li, Liu Yang, Qingwen Zhu, Daowei Liu, Yichao Wang
Summary: This paper systematically studies the coupled support technology of a composite rock beam roof under close coal seams through theoretical analysis, numerical simulation, and field tests. The results show that the vertical failure depth in the plastic zone of the #8 coal seam has not penetrated the roof of the #9 coal seam after mining. The numerical simulation demonstrates that roof cutting, arrangement of high-prestressed anchor cables, and setting up of vertical supports can effectively reduce the stress of supporting structure and roof pressure, as well as the convergence of the roof.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2023)
