Article
Engineering, Geological
M. Vicente da Silva, A. N. Antao
Summary: A new three-dimensional strength criterion for rocks is proposed in this paper, which combines the characteristics of two widely used criteria. The material parameters can be calibrated based on experimental data.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Geological
Hangzhou Li, Tong Guo, Yalin Nan, Bo Han
Summary: The study identifies the effect of sigma(2) on the strength of rocks through true triaxial tests and develops a simple 3D strength criterion. The modified criterion demonstrates a good fit to most rock types and performs better than other criteria in predicting rock strengths.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Engineering, Geological
Mingming He, Zhiqiang Zhang, Jiwei Zhu, Ning Li
Summary: The study proposes a new model to investigate the relationship between porosity and rock strength ratios, modifying the Hoek-Brown criterion to incorporate porosity instead of constants m(i) and s. Various rock tests show that the modified criterion effectively represents the impact of porosity on rock failure envelopes and can be used to estimate rock porosity and strength parameters.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
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
Engineering, Geological
Guilherme J. C. Gomes, John H. Forero, Euripedes A. Vargas, Jasper A. Vrugt
Summary: This paper discusses the importance of understanding rock anisotropy for reliability analysis and engineering design, and proposes a formulation for calculating strength anisotropy embedded in a Bayesian framework for practical application. The results demonstrate the accuracy of the proposed model in predicting peak strengths of rocks with varying degrees of anisotropy, confining stresses and anisotropy orientations, emphasizing the need for explicit treatment of strength anisotropy uncertainty in rock mechanics studies. The Bayesian methodology is versatile and can assist in informing geotechnical engineers, contractors, and other professionals about rock conditions, design reliability, and overall risks of engineering structures.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Yongtao Yang, Yang Xia, Hong Zheng, Zhijun Liu
Summary: A 3D nonlinear strength reduction numerical manifold method (3D-NSRNMM) based on the Generalized Hoek-Brown failure criterion is proposed to analyze the stability of rock slopes, considering the nonlinear failure property of rock masses. The study reveals that boundary conditions significantly influence the safety factor and failure mode of rock slopes in 3D analysis, with 2D analysis being more conservative. Additionally, safety factors based on instantaneous equivalent Mohr-Coulomb parameters are similar to those based on average equivalent parameters, but the failure modes differ slightly.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Geological
Kaizong Xia, Congxin Chen, Tianlong Wang, Yun Zheng, Yue Wang
Summary: This study develops a method to estimate GSI and D values using acoustic wave velocity, and proposes a new method for determining the mechanical parameters of the rock mass based on these improved values. The analysis results show that the method accurately reflects the factors affecting rock mass quality and disturbance, and its reliability is verified in practical engineering.
ENGINEERING GEOLOGY
(2022)
Article
Environmental Sciences
Alan Showkati, Mansour Sharafisafa
Summary: In this paper, an upper bound solution to the factor of safety (FoS) of an anchor-reinforced rock slope is developed using the Hoek-Brown failure criterion in combination with kinematic approach of limit analysis. Two ways to incorporate the non-linear HB criterion into limit analysis are considered: the tangential technique and the equivalent Mohr-Coulomb parameters method. An optimization scheme is programmed in Matlab to capture an upper bound to the slope FoS by trying all kinematically admissible failure mechanisms. The numerical results show good agreement with other approaches. However, the equivalent method generally overestimates FoS when compared to the tangential technique, meaning that caution should be exercised when using it.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Energy & Fuels
Chunguang Li, Cuihua Li
Summary: The fracture angle of Mohr-Coulomb is 45 degrees + φ/2, which is important in soil mechanics. However, the fracture angle of the non-linear Hoek-Brown criterion is not as easily derived. Using physical evidence of no parallel plastic strain in the shear zone, the fracture angle of Hoek-Brown materials is derived as tan-1√1 + m(2√s + mσ3/σc). Experimental and numerical results confirm the agreement between the theoretical and observed fracture angles.
GEOMECHANICS FOR ENERGY AND THE ENVIRONMENT
(2023)
Article
Geochemistry & Geophysics
Shiyue Zhang, Ruiyuan Gao, Qingxiang Meng, Xiaohu Zhang
Summary: This study investigated the calculation method of rock resistant coefficient based on the Hoek-Brown failure criterion and analyzed the sensitivity of different parameters. The results showed that the formula is more sensitive when a, sigma(c), and K-d are low.
Article
Computer Science, Interdisciplinary Applications
Su-Tang Wang, Xiao-Li Yang, Fu Huang, Qiu-Jing Pan
Summary: The paper presents a method for analyzing the stability of rock slopes in three dimensions, solving the hydraulic head distribution and calculating the seepage forces under steady state hydraulic conditions using numerical methods. The approach is validated through parametric analysis, showing that the safety factor increases with certain parameters but decreases with slope angle and aspect ratio increases.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Civil
Li Li, Bo Ni, Yue Qiang, Shixin Zhang, Dongsheng Zhao, Ling Zhou
Summary: Rock is a commonly used building material, studying its properties can improve production efficiency and construction safety. The improved H-B criterion proposed in this paper for calculating the strength of layered rocks shows good control of errors and avoidance of arbitrariness.
PERIODICA POLYTECHNICA-CIVIL ENGINEERING
(2022)
Article
Engineering, Geological
R. P. Bewick
Summary: Early understanding of rock masses is crucial for mine construction and operation, especially for cave mines. Designing and constructing in high stress and massive to moderately jointed rock mass conditions are critical, as unplanned rock mass behavior can negatively impact investment value.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Geological
Suraparb Keawsawasvong, Jim Shiau
Summary: This study presents an advanced approach to evaluate the stability of Hoek-Brown rock mass with a spherical cavity, using rigorous upper bound and lower bound solutions of stability factors solved through advanced finite element limit analysis. Comprehensive design charts, tables, and equations are provided for stability evaluation.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Mechanical
Yifan Chen, Hang Lin
Summary: The Hoek-Brown criterion is widely used in various fields. This study investigated the deterioration of Hoek-Brown parameters for freeze-thaw multi-fractured rock mass and proposed a new estimation method based on shear test. The values of GSI and mi were found to decrease with the increase of freeze-thaw cycles, following a negative exponential function model.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Construction & Building Technology
Arash Nikvar-Hassani, Lino Manjarrez, Lianyang Zhang
Summary: This paper investigates the incorporation of ordinary Portland cement (OPC) to adjust/improve the workability, setting time, and compressive strength of Class F fly ash (FA)-based geopolymer binder. The results show that the addition of OPC reduces the setting time and increases the compressive strength of the geopolymer binder. The incorporation of OPC also leads to a denser microstructure.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Arash Nikvar-Hassani, Lianyang Zhang
Summary: This study examines the feasibility of using fly ash with added cement kiln dust to synthesize a geopolymer cementitious material for building pumpable roof supports. The results show that the pumpability, setting time, and mechanical performance of the GCM can be effectively adjusted. The GCM shows higher peak and residual strength than the pumpable CMs currently used in practice.
MATERIALS AND STRUCTURES
(2022)
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
Engineering, Geological
Haohua Chen, Lianyang Zhang
Summary: This paper presents a machine learning-based method for predicting the end-bearing capacity of rock-socketed shafts. Four commonly used ML algorithms were utilized to train models and an ensemble learning approach was used to enhance the prediction accuracy. The results show that the ML-based method outperforms existing empirical equations in predicting end-bearing capacity. A graphical user interface (GUI) app was developed for the convenient application of the method. Two examples demonstrate the accuracy and efficiency of the GUI app in predicting the end-bearing capacity of rock-socketed shafts.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Arash Nikvar-Hassani, Hamad N. Alnuaimi, Umar Amjad, Saptarshi Sasmal, Lianyang Zhang, Tribikram Kundu
Summary: This paper investigates the applicability of nondestructive testing and evaluation method using ultrasonic signals to monitor the curing of alkali-activated fly ash-based concrete. The results show that non-linear ultrasonic technique has an advantage in monitoring the curing process of specimens with a lower water/binder ratio, while specimens with a higher water/binder ratio do not show clear distinctions between the curing times measured from the two ultrasonic techniques. In addition, the unconfined compressive strength results show a good correlation with the ultrasonic results.
JOURNAL OF NONDESTRUCTIVE EVALUATION, DIAGNOSTICS AND PROGNOSTICS OF ENGINEERING SYSTEMS
(2022)
Article
Construction & Building Technology
Arash Nikvar-Hassani, Hamidreza Vashaghian, Renee Hodges, Lianyang Zhang
Summary: The study demonstrates that the use of low-reactive copper mine tailings and slag as supplementary cementitious materials can produce green geopolymer bricks that meet ASTM requirements.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Arash Nikvar-Hassani, Renee Hodges, Lianyang Zhang
Summary: This study investigates the durability and leaching behavior of geopolymer bricks produced from low-reactive copper mine tailings. The results show a substantial loss in compressive strength after durability tests, but the weight loss is small. Most importantly, the geopolymer bricks successfully stabilize the contaminants in the mine tailings.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Arash Nikvar-Hassani, Lianyang Zhang
Summary: This study investigates the use of biopolymer to improve the ductility of fly ash based geopolymer cementitious material for pumpable roof support. The results show that incorporation of biopolymer up to 0.5 wt.% slightly affects the compressive strength and Young's modulus, but effectively increases the residual strength. However, the tensile strength slightly decreases with the inclusion of biopolymer.
MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Geological
Qi Zhang, Xiaojun Wang, Hehua Zhu, Keshen Zhang, Xiaojun Li
Summary: The geometric attributes of discontinuities are crucial for accurately modeling the discrete fracture network (DFN) of a rock mass. Estimating the three-dimensional geometric parameters of multiple sets of discontinuities using observation data is difficult. This study proposes a mixture distribution model for the 3D geometric attributes of multiple discontinuity sets and establishes a method for estimating the mixture distributions using two-dimensional trace data. The model is verified using Monte Carlo simulations and applied to a tunnel excavation, showing good agreement with reality.
ENGINEERING GEOLOGY
(2022)
Editorial Material
Engineering, Geological
Haohua Chen, Lianyang Zhang
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Haohua Chen, Hehua Zhu, Lianyang Zhang
Summary: This paper presents an analytical approach for assessing the stability of rock slopes by considering the effects of intermediate principal stress. The approach combines the use of a three-dimensional Hoek-Brown criterion and a genetic algorithm to optimize the potential failure surface and determine the factor of safety and critical failure surface of the rock slope. The proposed approach is validated through comparisons with other methods and numerical simulations, and parametric studies highlight the importance of considering various factors when evaluating rock slope stability.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Qi Zhang, Xiaojun Wang, Hehua Zhu, Wuqiang Cai, Xiaojun Li
Summary: The study presents a density-based multi-level clustering method to estimate the three-dimensional diameter distributions of multiple fracture sets based on fracture orientation and size. The method addresses the boundary problems of orientation domains and utilizes K-means clustering with fast search and find of density peaks to determine fracture set centers. The proposed method is validated and applied to an excavation face in Sejilashan tunnel, demonstrating good agreement with field observations and geological survey results on the clustered outcrop fractures and estimated diameter distributions of multiple fracture sets.
Article
Energy & Fuels
Qi Zhang, Chenhao Zhang, Yifeng Lin, Yuanhai Li, Yixin Shen, Yuechao Pei
Summary: This study comprehensively investigates the deterioration of bedrocks by pressurized seawater. Mechanical experiments demonstrate that granite is almost impervious to pressurized seawater, while sandstone and tuff are significantly deteriorated, especially by pressurized seawater. The elastic P-wave velocity of different types of rocks exhibits varying trends. The findings provide valuable guidance for the construction and operation of offshore wind power turbines.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Multidisciplinary Sciences
Ramin Kazemi, Rasoul Shadnia, Hamid Eskandari-Naddaf, Lianyang Zhang
Summary: A multi-scale experimental study was conducted to investigate the effect of different cement strength classes on the porosity, flexural, and compressive strengths of cement-mortar. The study found that the porosity and strengths of the cement-mortar varied significantly with different cement strength classes. A new multi-objective model using artificial neural network was proposed to analyze the experimental data and provide accurate predictions of the properties. The study highlights the importance of considering cement strength class when designing cement-mortar.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Mining & Mineral Processing
Jinhai Liu, Yanlin Zhao, Tao Tan, Lianyang Zhang, Sitao Zhu, Fangyan Xu
Summary: This paper explores the hydrogeological characteristics and mine water inflow issues in the southern coalfields of China, using the Meitanba mine as a case study. The research reveals the relationship between mine water inflow and factors such as mining depth, development of karst structures, and rainfall infiltration. By employing the big well method and a hydrogeological model, the prediction of mine water inflow trends is made possible.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2022)
