Article
Engineering, Geological
Qibin Lin, Ping Cao, Guanping Wen, Jingjing Meng, Rihong Cao, Zhiye Zhao
Summary: Research shows that the crack coalescence process in layered rock masses is influenced by joint angle and rock bridge angle, with seven types of crack coalescence identified that are not only related to angles but also influenced by rock layers.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
C. Wei, B. Zhang, W. Zhu, S. Wang, J. Li, L. Yang, C. Lin
Summary: The study shows that applying fluid pressure in the fracture can accelerate wing crack propagation while inhibiting the formation of secondary cracks, leading to tensile failure of specimens. Fluid pressure in the fracture promotes the initiation and propagation of wing cracks, but also gradually decreases the initiation stress and peak strength of the specimens.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Mechanics
Zeinab Aliabadian, Mansour Sharafisafa, Faham Tahmasebinia, Luming Shen
Summary: This paper investigates the impact of pre-existing flaws in rocks on crack initiation, propagation, and coalescence, and demonstrates the feasibility of using 3D printing technology in combination with DIC and BPM models to replicate the behavior of natural rocks. It shows that systematic analysis of different flaw configurations can provide comprehensive insights into crack coalescence.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Geological
Guokai Zhang, Haibo Li, Chunjiang Zou, Mingyang Wang, Zhen Wang
Summary: In this study, the damage process of double-flawed granite samples under uniaxial compression is monitored using acoustic emission (AE) techniques and digital image correlation (DIC). The evolution of the coalescence properties before and after the initiation of macro-cracks is analyzed using multiple AE signal characteristics and DIC results. The results show that both exterior and interior fractures can be identified using the combination of AE parameters and DIC. The coalescence behavior strongly depends on the flaw geometries.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Chemistry, Physical
Luming Zhou, Shu Zhu, Zhende Zhu, Xinghua Xie
Summary: In this study, an orthotropic-bond-based peridynamic (PD) model was established to predict the crack propagation path and failure mode of fiber-reinforced concretes (FRCs). It was found that the crack propagation direction varies under different conditions, and the failure degree of FRC increases with the increase in heterogeneity.
Article
Engineering, Geological
Chao Wei, Shucai Li, Bo Zhang, Yang Song, Yu Zhang, Xianggang Wang
Summary: This study investigates the influence of fluid pressure and lateral pressure on crack propagation, rock bridge failure mechanism, and rock failure modes through experimental analysis. The results show that under uniaxial compression, fluid pressure and lateral pressure change the failure forms and strength characteristics of rock bridges, promoting the growth of tensile cracks and causing more obvious brittle failure characteristics in the specimen.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Pingyang Fan, Jianxin Liu, Wengui Zuo, Min Wang, Daoyong Zhang
Summary: The existence of preexisting fissures in rock masses has a substantial impact on engineering stability. This study investigates the development of specimens with different preexisting fissure types. The findings reveal that the length of the preexisting fissure significantly influences peak strength and coalescence mode.
APPLIED SCIENCES-BASEL
(2022)
Article
Geography, Physical
Hai-liang Jia, Li Han, Tao Zhao, Qiang Sun, Xian-jun Tan
Summary: Understanding the mechanical properties of frozen flawed rock masses is crucial for safe rock engineering. This study investigates the strength and cracking behavior of frozen flawed sandstone and finds that temperature and flaw inclination angle have significant effects. Flaw inclination angle has a dramatic impact on crack coalescence behavior and final failure form.
PERMAFROST AND PERIGLACIAL PROCESSES
(2022)
Article
Multidisciplinary Sciences
Jiaqing Cui, Guorui Feng, Zhu Li, Yanna Han, Cheng Song, Xiaohong Niu, Xiaoze Wen
Summary: This study investigated the crack propagation characteristics of rock with cross-flaws in three different filling states using mechanical tests and observation techniques. The results showed that filling can inhibit crack propagation, stress drop, and improve the strength and stiffness of the rock.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Article
Mechanics
Mansour Sharafisafa, Zeinab Aliabadian, Faham Tahmasebinia, Luming Shen
Summary: This study investigates the failure patterns of rock-like specimens with pre-existing flaws, utilizing 3D printing technology coupled with digital image correlation (DIC) and bonded particle model (BPM). The presence of filled flaws significantly affects the deformation behavior of the specimens. Different types of flaws lead to various failure modes, with filled specimens showing higher peak loads due to the additional energy required to fracture the filling material.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Geochemistry & Geophysics
Jianchao Wang, Yan Zhang, Changan Qin, Yaohui Gao, Zhaofeng Wang, Guofeng Zhang
Summary: This paper conducts direct shear tests on jointed rocks with different rock bridge lengths to study their mechanical properties, AE characteristics, and fracture mechanism during failure. Results show that the rock bridge length has a significant influence on shear strength, AE, and fracture mechanism.
Article
Geochemistry & Geophysics
Jianchao Wang, Yan Zhang, Changan Qin, Yaohui Gao, Zhaofeng Wang, Guofeng Zhang
Summary: This paper investigates the mechanical properties, acoustic emission characteristics, and fracture mechanism of jointed rocks with different rock bridge lengths through direct shear tests. The study reveals that the length of the rock bridge plays a significant role in the shear strength, acoustic emission characteristics, and fracture mechanism. The fracture criterion and crack growth angle are derived based on linear elastic fracture mechanics, which are consistent with the experimental results.
Article
Multidisciplinary Sciences
Hewan Li, Jian Liu, Laigui Wang, Tianjiao Ren
Summary: This paper proposes a method to analyze rock samples with different inclination angles from the standpoint of energy, using the bond-base peridynamic theory and the PMB model of brittle materials, combined with laboratory experiments. The whole process of shearing is analyzed, and the LAMMPS software is used to simulate the internal energy change of rock-like materials under shear conditions. The result shows that prefabricated cracks and the inclination of cracks are important factors for specimen damage, which has important theoretical value for rock mechanics research. The research results can reduce the occurrence of rock burst accidents, the difficulty of mine support, and the cost of mining engineering, as well as improve mine safety levels.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Mechanical
Tengfei Guo, Kewei Liu, Ruitao Song
Summary: This study investigates the fracture initiation and propagation in rock-based layered materials, focusing on the interactions with the interlayer interface. A numerical model based on the cohesive zone model (CZM) method is established and validated against experimental tests. The results reveal the influence of factors such as interface strength, crack inclination angle, crack length ratio, and support span ratio on the fracture behavior. The findings are important for assessing the stability of rock-based structures.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Geochemistry & Geophysics
Huilin Le, Jihong Wei, Shaorui Sun, Yi Lv
Summary: This study focuses on the influence of open-closed cross-flaws on cracking behaviors and mechanical properties of rock masses. Rock-like samples containing open-closed cross-flaws with different geometries were fabricated and tested under uniaxial compressive conditions. Different types of cracks and failure modes were observed, and it was found that the inclination angle of the open flaw has a significant effect on the strength of the samples.
Article
Computer Science, Interdisciplinary Applications
Yifan Chen, Hongsheng Li, Hang Lin, Yixian Wang, Yanlin Zhao, Yizhou Chen
Summary: Previous studies in slope stability research focused on safety factor calculations, neglecting critical slip line recognition and extraction. This study proposes an automatic recognition and rapid extraction method for the slip line of a slope, utilizing a modified k-medoid clustering algorithm to separate slip mass and stable mass based on horizontal displacement differences of nodes. The boundary is considered the critical slip line. For slopes requiring high slip line accuracy, discrete point networks are recommended to be arranged at custom intervals in the slip region, with horizontal displacement calculated using an inverse transformation method. The accuracy of slip line identification and extraction is improved using the modified k-medoid clustering algorithm, reducing grid size influence and subjective definitions.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Environmental Sciences
Yifan Chen, Hang Lin, Rihong Cao
Summary: This paper proposes a new piecewise constitutive relation consisting of damage constitutive relation and compaction constitutive relation to reflect the nonlinear characteristics of rock compaction during the establishment of freezing-thawing rock damage constitutive models. The freezing-thawing damage was characterized by the change of rock deformation modulus, and the damage statistical constitutive relation was founded based on the improved Harris distribution and the generalized equivalent strain theory. The rock compaction relation was divided into framework component and void component, and the corresponding compressive deformation was calculated using Hooke's law and true strain analysis method, respectively. The correctness and applicability of the proposed expression were validated by comparing the theoretical curves and experimental curves.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Construction & Building Technology
Panpan Guo, Xiaonan Gong, Yixian Wang, Hang Lin, Yanlin Zhao
Summary: The objective of this paper is to analyze the observed performance of a deep excavation facing severe restrictions from underground facilities or structures in Suzhou, China. The study examines the impact of two shallowly buried pressurized pipelines and the planned construction of twin tunnels on the excavation. Through in-depth analysis of field performance data, the authors capture various characteristics including ground settlements, lateral ground movements, and pipeline deformations. Despite the challenges posed by the restrictions, the specially designed excavation support system effectively controls ground and structural deformations.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ziyi Yin, Rui Li, Hang Lin, Yifan Chen, Yixian Wang, Yanlin Zhao
Summary: Currently, tailings are mostly piled up in tailings ponds, resulting in a massive waste of mineral resources and posing a significant threat to the environment and ecology. Utilizing tailings to partially replace cement in cementitious materials is an effective method to reduce tailings accumulation. This study prepared lead-zinc tailings-based cementitious materials using lead-zinc tailings, fly ash, and ordinary Portland cement, and investigated the effects of four factors (lead-zinc tailings, fly ash content, cement content, and water-binder ratio) on the mechanical properties of lead-zinc tailings through orthogonal experiments. The corresponding relationship between these factors and the properties of the cementitious materials was determined, achieving optimization and prediction of the raw material ratio for lead-zinc tailings-based cementitious materials. The test results showed that when the proportion of fly ash : lead and zinc tailings : cement was 30:40:30 and the water-binder ratio was 0.4, the predicted compressive strength of the prepared cementitious material reached 22.281 MPa, meeting the strength requirements, while the total content of lead-zinc tailings and fly ash was the highest at that time.
Article
Chemistry, Physical
Linglin Xie, Wenyu Tang, Hang Lin, Fan Lei, Yifan Chen, Yixian Wang, Yanlin Zhao
Summary: In this study, cyclic shearing tests combined with the shear surface topography-sensing technology are conducted to investigate the evolution characteristics of the rock-mortar interface morphology and strength deterioration. The results have important implications for the research on the shear performances of rock-mortar interface under cyclic load in rock mass engineering.
Article
Chemistry, Physical
Yifan Chen, Hang Lin, Shijie Xie, Rihong Cao, Shuwei Sun, Wenhua Zha, Yixian Wang, Yanlin Zhao, Huihua Hu
Summary: In this study, a piecewise constitutive model was proposed to simulate the nonlinear fracture compaction deformation in the whole process of rock failure. The model consisted of a fracture compaction empirical model and a damage statistical constitutive model. The parameters of the models were calculated based on the geometrical characteristics of the axial stress-strain curve to ensure continuity and smoothness at the curve intersection. The models were validated using uniaxial compression test data and triaxial compression test data, showing great consistency with the experimental results, particularly in the pre-peak stage.
Article
Chemistry, Physical
Bo Liu, Yifan Chen, Hang Lin, Rihong Cao, Shengwen Zhang
Summary: In this study, a direct shear test was conducted on joints with different roughness to investigate their strength characteristics. The deformation and acoustic emission characteristics of the joints were analyzed using DIC and AE techniques. A new method for predicting the instability of joints under normal unloading was proposed based on the evolution law of U-n, U-s, and U-0. The results showed that the unloading amount of normal stress increased with greater initial normal stress and roughness, while it decreased with an increase in initial shear stress. AE events reached their maximum when the normal stress was equal to the failure normal stress, and the b-value fluctuated more frequently during stable development periods under normal unloading conditions. U-0 changed with the loading and unloading of stress, and the abrupt change of U-0 could be used to predict the unloading instability of rock mass.
Article
Mechanics
Ri-hong Cao, Lei Fang, Xianyang Qiu, Hang Lin, Xilong Li, Wenxin Li, Qiuqiu Qiao
Summary: In hot dry rock geothermal energy extraction systems, the heating-water cooling cycles can lead to failure and instability in the rock masses. This study investigated the shear fracture characteristics of granite rocks after H-WC cycles treatment. The results revealed that cyclic H-WC treatment decreased the fracture toughness values, increased the porosity of the granite samples, and affected the acoustic emission characteristics. The study also found that the cyclic H-WC treatment enhanced the fracture plane roughness and its impact increased with increasing temperature.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Geological
Shijie Xie, Hang Lin, Hongyu Duan
Summary: This paper proposes a conceptual model based on renormalization group theory to qualitatively explain the evolution mode of shear deformation and derives the mathematical description of the critical failure point considering the stress transfer mechanism. The criterion for yield shear displacement is obtained by combining the renormalization group model with the shear constitutive model. Experimental results based on the ratio of yield stress to shear strength for different rock types are provided to verify the proposed criterion.
ENGINEERING GEOLOGY
(2023)
Editorial Material
Geochemistry & Geophysics
Yanlin Zhao, Lianyang Zhang, Yixian Wang, Hang Lin
Article
Engineering, Geological
Yi Tang, Hang Lin, Rihong Cao, Shuwei Sun, Wenhua Zha
Summary: Rock sections in intermittent joints are crucial in maintaining rock mass stability and preventing joint interconnection. The orientation of these rock sections significantly impacts the uniaxial compressive strength and damage mode of the samples. As the angle of the rock section increases, there is an increase in the compaction stage and a decrease in the plastic-yield stage. Additionally, the damage constitutive model considering compaction stage and initial damage provides insights into the rate of rock damage affected by the rock section angle.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Mechanical
Yifan Chen, Hang Lin, Linyuan Liang
Summary: This paper studies the freeze-thaw failure characteristics and strength loss of non-penetrating fractured rock mass with different fracture densities through theoretical derivation and laboratory tests. It explores the effects of freeze-thaw cycles and fracture density on the failure characteristics of non-penetrating fractured rock mass samples comprehensively from both the macro and micro perspectives, combining the apparent observation method with acoustic emission monitoring technique. The findings provide a better understanding of the freeze-thaw damage characteristics of rock mass and contribute to the stability assessment of rock mass.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Xing Zhang, Hang Lin, Huihua Hu, Yanhui Cheng, Wanyi Zhang
Summary: A comprehensive rheological constitutive model is proposed in this paper to consider the rheological effects of bolted joints across different rheological stages and bolt characteristics. The model effectively describes the shear rheological behavior of bolted joints and provides valuable theoretical guidance for rock mass engineering projects.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Haolei Zhao, Yixian Wang, Xian Li, Panpan Guo, Hang Lin
Summary: A Bayesian optimization-based extreme gradient boosting (XGBoost) prediction model, called BO-XGBoost, was developed to assess tunnel uplift. The model incorporated various factors such as engineering design, soil types, and site construction conditions as input parameters. Compared to other models, the BO-XGBoost model demonstrated superior accuracy in displacement predictions and better generalization capabilities.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Su Li, Hang Lin, Rihong Cao, Yixian Wang, Yanlin Zhao
Summary: The influence of ligament length and joint angle on failure characteristics of fractured rock is studied using uniaxial compression experiments. It is found that the mechanical parameter curves exhibit a U-shape or V-shape as the ligament length increases. The type of cracks and the driving displacement field of wing cracks are affected by joint angle variation.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
