Article
Environmental Sciences
Zaicheng Xu, Wei Xu, Zhenhua Zhu, Junyi Zhao
Summary: This paper takes the gypsum mine goaf in Diaodao District, Jingmen City as an example, and investigates the overall structure and distribution characteristics of the gypsum goaf. It uses InSAR and GNSS technology to analyze the ground deformation of the goaf and evaluate its stability. The research shows that two subsidence areas and three deformation areas were identified using DInSAR and time series InSAR, respectively, and the deep buried areas in the goaf were monitored by GNSS. The surface deformation is dominated by horizontal displacement, and the direction of horizontal displacement points to the goaf.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Xiangdong Zhang, Wenliang Li, Tianyu Li, Zong Li, Guanjun Cai, Zhen Shen, Rantong Li
Summary: This study comprehensively analyzes the safety and stability of old goaf under construction engineering based on specific projects using a variety of research methods. The Beijing Mentougou mining area is used as the research background. The methods of field investigation, laboratory testing, engineering drilling, geophysical exploration, theoretical calculation, and numerical simulation are combined to quantitatively analyze the stability of the foundation and ground buildings in old goaf. The influence depth of the building load and height of the caving crack zone are calculated using the three-zone theory to judge if the goaf is at risk of activation. Further simulation is conducted using two types of finite element analysis software, which increases the reliability of the numerical analysis. The results demonstrate that uneven subsidence of approximately 100 mm occurs in the buildings and ground surface, and subsidence of approximately 50 mm occurs in the goaf roof. It is also proven that goaf affects the stability of the surrounding rock and building foundation. Finally, a goaf treatment scheme is proposed. The treatment effect is found to be remarkable through field tests and numerical simulations, ensuring the safety and stability of a building foundation. The combination of theoretical calculation and numerical simulation can effectively evaluate the safety and stability of the project under load, and has a strong promotion and application value. The research results meet the needs of engineering practice, and provide a great reference value for the rational utilization of the land above the old goaf in the Mentougou district of Beijing and similar mining cities, which has a good theoretical significance and application prospect.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Honglei Liu, Yong Zhao, Penghai Zhang, Feiyue Liu, Tianhong Yang
Summary: The study shows that the test stope at Xiadian Gold Mine, using the increased stope structure parameter, faces significant damage and instability risks.
GEOMATICS NATURAL HAZARDS & RISK
(2021)
Article
Chemistry, Multidisciplinary
Yungang Shi, Huaijian Wang, Xin Tan, Yuxuan Jin, Jiaxu Wang, Bigang Tang
Summary: An abandoned gypsum mine has been discovered beneath a highway construction in Hunan province, China. A comprehensive stability analysis is urgently needed due to safety concerns. 3D laser scanning and numerical modeling were used to assess stability and determine the need for reinforcement measures.
APPLIED SCIENCES-BASEL
(2023)
Article
Energy & Fuels
Yuantian Sun, Ruiyang Bi, Junbo Sun, Junfei Zhang, Reza Taherdangkoo, Jiandong Huang, Guichen Li
Summary: This study investigates the use of stress relief technique in maintaining the stability of coal mine roadways. Theoretical analysis, numerical simulation, and field tests show that this technique effectively controls deformation and anchor cable stress, ensuring the long-term stability of the roadways.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Materials Science, Multidisciplinary
Aliaksandra Tsitova, Fabien Bernachy-Barbe, Benoit Bary, Francois Hild
Summary: This study investigated the creep damage of concrete using experimental and numerical methods. Compressive creep tests were conducted on cement paste and mortar to analyze the influence of material heterogeneity and stress level on creep rate. The obtained data were used to calibrate a creep constitutive model and predict the creep damage interactions.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Civil
Feng Huang, Xiaoxiong Shi, Chuangzhou Wu, Guangfa Dong, Xingchen Liu, Aichen Zheng
Summary: The goaf formed by coal seam mining reduces the strength and stiffness of the surrounding ground, hindering tunnel excavation near the mined-out area. This study investigated the impact of dip angle, thickness, and distance of the coal seam goaf on the stability of unsupported tunnel excavation using numerical analysis and model tests. The results showed that the stress increment and displacement in the tunnel varied along the radial direction, with a larger stress loosening zone (SLZ) near the goaf. The research findings are crucial for tunnel support design, construction, and excavation planning.
Article
Green & Sustainable Science & Technology
Zaicheng Xu, Wei Xu, Peng Zhou, Zhenhua Zhu, Junyi Zhao, Peng Gao
Summary: Goaf restoration is crucial for urban safety and development. This study analyzed the deformation mechanism of the goaf and established a numerical model, which was used to evaluate the goaf stability and study the ecological restoration model. The results showed that different degrees of ecological restoration and construction can be carried out in the goaf.
Article
Engineering, Multidisciplinary
Michael Siu Hey Leung, Joseph Corcoran
Summary: The value of using permanently installed monitoring systems for managing engineering assets depends on the confidence in their damage detection capabilities. A proposed framework integrates detection data with probabilistic structural integrity assessments, utilizing probability of detection (POD) curves and particle filtering methods to continuously update estimated defect size and failure probability. The framework demonstrates the potential of permanently installed sensors to maintain confidence in fitness-for-service while reducing the need for frequent inspections, ultimately improving integrity management.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Fang Yuan, Jianxin Tang, Yanlei Wang, Cheng Li, Lingrui Kong
Summary: Coal mined-out areas have a significant impact on mining safety and neighboring coal faces' pressure distributions. The PFC3D software was used to analyze the mechanical characteristics of goafs, and core loading tests were conducted to verify the numerical simulation method. The study found that the void ratio, particle size ratio, and particle size distribution of the rock particle sample had a significant influence on the compression deformation characteristics of the rock block. Additionally, the strength and cohesion of parallel bonds had an impact on compression deformation traits of the rock block when the axial stress level was lower than 12 MPa.
MINING METALLURGY & EXPLORATION
(2022)
Article
Environmental Sciences
Fengjie Zhang, Hao Xu, Yueping Qin, Mingyan Guo, Shudong He, Kai Wang, Yongtao Shi, Zhencai Xiang
Summary: In this paper, a three-dimensional numerical model was established to simulate the influence of accumulated methane in goaf on the working face airflow during coal mining. The reliability of the simulations was verified by measured data, and the optimal location for gas extraction was determined. On-site gas extraction tests were carried out to evaluate the effectiveness, and the results showed a significant reduction in gas concentration. This study provides fundamental support for the design of on-site boreholes to extract gas from mining voids and reduce gas hazards in coal mines.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Civil
Qing Wang, Jia-Liang Le, Xiaodan Ren
Summary: This study proposes a time-dependent constitutive model to predict the delayed failure behavior of concrete materials, which combines continuum damage mechanics and nonlinear creep theory. The model is calibrated and validated through experiments, and it successfully captures the contributions of different mechanisms to the overall structural response. It can be used to predict the failure behavior of concrete structures under sustained loading.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Mechanical
Ronghai Wu, Yufan Zhang
Summary: In this study, a novel model coupling phase-field, dislocation density based plasticity and damage is proposed. The model successfully solves the issues in previous dislocation and phase-field coupled simulations and captures the phenomenon that has rarely been considered before. The simulated results using this model are in good agreement with experimental results.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
D. Breslavsky, A. Senko, O. Tatarinova
Summary: Experimental study on creep-damage processes in notched specimens subjected to static and periodic loading was conducted, followed by simulations using Rabotnov evolution equation. Constitutive equations for dynamic creep were derived using asymptotic and averaging methods. Numerical results were obtained through FEM and predictor-corrector time integration scheme, while fracture process was studied through a designed numerical procedure. Qualitative differences in crack propagation processes between static and periodic loading conditions were observed.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2021)
Article
Environmental Sciences
Ting Wang, Rui Zhang, Runqing Zhan, Age Shama, Mingjie Liao, Xin Bao, Liu He, Junyu Zhan
Summary: The mountainous area of southwest China presents challenges to the selection, construction, and operation of airports due to its significant topography and complex geological conditions. This study monitors and analyzes the uneven ground subsidence during the construction of Suining Anju Airport using SAR image data and numerical simulation methods. The results show that the subsidence mainly occurs in the filling areas of the airport, posing a threat to its ground stability.
Article
Engineering, Geological
Xinrong Wang, Tianhong Yang, Kai Guan, Xige Liu, Yong Zhao
Summary: Pillars are commonly used to support the roof in underground mining. The failure of pillars can be gradual or sudden, depending on the stability of the system. The stress transfer between pillars can also affect the stability of adjacent pillars. The geometric and mechanical parameters of the system play a crucial role in pillar failure. Adjusting the entry widths can help reduce the possibility of pillar unstable failure.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Chen Hou, Liujun Yang, Lei Li, Baoxu Yan
Summary: This article experimentally and theoretically investigates the physical and mechanical properties of cemented paste backfill (CPB) under the coupling effect of curing time, solid content, and binder content. The results show that increasing binder content effectively enhances the later strength of CPB. A sensitivity parameter considering the span of multi-factor is constructed, which indicates that curing time has the greatest impact on uniaxial compressive strength (UCS) while the variation in solid content has the least impact on it.
FRONTIERS IN MATERIALS
(2022)
Article
Environmental Sciences
Gengjie Zhu, Wancheng Zhu, Zhaojun Qi, Baoxu Yan, Haiqiang Jiang, Chen Hou
Summary: This study proposes a one-part alkali-activated slag (AAS) as an environmentally friendly binder for cemented fine tailings backfill (CFTB). The AAS yields higher strength than ordinary Portland cement (OPC) and produces unique ettringite and calcium silicate hydrate gel.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Zhen Yang, Wancheng Zhu, Kai Guan, Baoxu Yan, Hanwen Jia
Summary: Explored the influence of dynamic disturbance on creep behavior of rock and found that it alters the creep behavior of rock in terms of time, space, and energy.
GEOMATICS NATURAL HAZARDS & RISK
(2022)
Article
Geosciences, Multidisciplinary
Zhen Yang, Wancheng Zhu, Kai Guan, Baoxu Yan, Wenjun Luo, Peng Liang
Summary: Anchor technology is essential in geotechnical engineering to reinforce jointed rock masses. This study investigates the effects of anchorage and the three-dimensional crack propagation process through physical model tests and numerical simulations. The results show that anchorage improves the compressive performance and deformation capability of jointed rock masses, controlling crack propagation and restraining shear zone formation. The optimal anchor opportunity varies with joint angle.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Construction & Building Technology
Baoxu Yan, Hanwen Jia, Erol Yilmaz, Xingping Lai, Pengfei Shan, Chen Hou
Summary: Based on laboratory tests and numerical simulation, this study establishes a framework to simulate the hardening backfill in a mining stope. The study reveals the significant influence of hardening process, curing stress, filling rate, and shrinkage deformation on the stress distribution and deformation behavior of the backfill and surrounding rockmass.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Kai Guan, Wancheng Zhu, Qinglei Yu, Lan Cui, Fei Song
Summary: This study proposes a plastic-damage theoretical approach to investigate the inelastic behavior induced by excavation in construction. A model for circular excavation is established by decomposing strains into elastic, plastic and damage parts, within the framework of finite strain and using a hypoelastic-plastic theory. Numerical validation is conducted on two examples. The research findings are of great significance in understanding various issues related to excavation construction.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Engineering, Geological
Huicong Xu, Xingping Lai, Pengfei Shan, Yanbin Yang, Shuai Zhang, Baoxu Yan, Yun Zhang, Nan Zhang
Summary: In recent years, rockbursts induced by the instability of the coal-rock mass have become more serious in steeply-inclined coal seam mining in the Urumqi mining area. This study investigated the energy dissemination characteristics and squeeze-prying induced-shock mechanism of steeply-inclined coal-rock mass during deep mining. The results revealed the deep mining limit depth of the Wudong Coal Mine and the long-term low frequency-energy storage period of the mass. The study also proposed control measures to effectively reduce high energy microseismic events and stress concentration in the strong-weak structural area.
Article
Engineering, Geological
Wancheng Zhu, Baoxu Yan, Xige Liu, Zhen Yang, Kai Guan
Summary: A damage-based creep model was established to quantify the impact of dynamic disturbances on rock creeping. Numerical simulations and case studies showed that dynamic disturbances could accelerate damage and deformation of creeping rock, affecting the stability of shaft.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Geochemistry & Geophysics
Liming He, Jiuyang Cai, Wang Cao, Yachun Mao, Honglei Liu, Kai Guan, Yabo Zhou, Yumeng Wang, Jiashuai Kang, Xingjie Wang, Panke Pei
Summary: In this study, the probability integral method, InSAR, and the Okada dislocation model were collaboratively used to analyze deformation in the Alhada Pb-Zn mine. The predicted deformation values using the probability integral method were compared with the time-series deformation analysis using InSAR, and the optimal parameters of the underground-mining ore body causing surface subsidence were inverted using the Okada dislocation model. Ground deformation was further simulated using the multi-source Okada model. The results showed a high correlation between the predicted and observed deformations. The analysis and comparison of the InSAR results concluded that the three subsidence areas do not threaten the stability of the main buildings in the mining area.
Article
Construction & Building Technology
Liujun Yang, Chen Hou, Wancheng Zhu, Xige Liu, Baoxu Yan, Lei Li
Summary: This study investigated the mechanical properties and failure process of cemented paste backfill (CPB) with different hardening times. The experimental results showed that the hardening process of CPB is closely related to peak strength, brittleness index, and maximum strain. Furthermore, the fracture development of CPB can be divided into four stages, and the failure pattern changes as the water content decreases.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Gengjie Zhu, Wancheng Zhu, You Fu, Baoxu Yan, Haiqiang Jiang
Summary: For mines located in saline areas, the use of mine water containing chloride salts can be an efficient way to prepare cemented tailings backfill (CTB) for mined-out area treatment, saving freshwater resources. However, the impact of chloride salts on the hydration behavior and strength properties of CTB remains unclear. This study investigates the effects of different concentrations of NaCl, CaCl2, and MgCl2 on the strength of CTB prepared with alkali-activated slag binder. The results provide insights into the hydration process and microstructure of CTB, enabling the application of chloride-containing mixing water in saline mines.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Multidisciplinary Sciences
Yong Yang, Minsi Zhang, Gaojian Huid, Kai Guan
Summary: In this study, Xincheng Gold Mine is used as an example to investigate the ground subsidence caused by filling. Both numerical simulations and simulation experiments are conducted to simulate the deformation process at the stope roof and bottom during excavation and filling. The results show that filling can slow down ground subsidence, and the displacements of the top and bottom of the stope increase with increased buried depth and lateral pressure coefficient.
