Article
Engineering, Geological
Jinchao Wang, Hanhua Xu, Wei Chen, Chuanying Wang, Zengqiang Han
Summary: This paper proposes a rock mass integrity evaluation method based on multivariate data analysis, which extracts key geological data from digital images and digital signals obtained by conventional logging methods. Compared with traditional methods, this method considers more factors that affect the stability of rock mass.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Jianhua Guo, Chaoyi She, Houbin Liu, Shuai Cui
Summary: This study systematically analyzed the borehole stability issues during drilling in the dolomite formation of the Leikoupo formation in western Sichuan and established a prediction model. The research revealed the mechanism of fractured dolomite formation and its influencing factors. The generalized H-B criterion model based on acoustic waves can be used to evaluate the wellbore stability of dolomite fracture formation with multiple fracture sets.
Article
Engineering, Geological
Zheng-Wei Li, Yuan Liu, Shi-Ming Mei, Shi-Cheng Xing, Xiao-Kai Wang
Summary: In this study, the effective thermal conductivity of fractured rock masses was numerically investigated, revealing a relationship between lambda(Eff) and fracture parameters that can be fitted with power law or negative exponent functions. It was also found that lambda(Eff) is linearly positively correlated with lambda(Intact), with the slope of the fitted line determined by fracture network parameters.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Mingwei Li, Zhifang Zhou, Meng Chen, Jian Wu
Summary: Studying the topological characteristics of fractured rock mass can help estimate the topological representative element volume (TREV) and accurately calculate the permeability representative element volume (PREV), simplifying the seepage calculation process.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
R. Zhang, H. P. Xie, L. Ren, J. H. Deng, M. Z. Gao, G. Feng, Z. T. Zhang, X. P. Li, Q. Tan
Summary: The deeper the burial depth, the more severe the rock damage and the more complex the fracture network caused by excavation-induced deterioration. At shallow depths, an excavation-damaged zone and excavation-disturbed zone were found, while at greater depths, a highly damaged zone and excavation-disturbed zone were observed. The formation of excavation-damaged zones at deep depths follows a stress-concentration-controlled mode, while a pure unloading-controlled mode is observed at very shallow depths.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Mechanics
Hao Shi, Chen Wenlong, Houquan Zhang, Song Lei, Li Ming, Wang Miaojing, Lu Pengju
Summary: This study investigated the effect of natural fractures on the dynamic impact strength of rock mass through numerical specimen simulations and experiments. The research found that the number of prefabricated fractures is related to stress transmission and impact strength.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Environmental Sciences
Guang Li, Gang Liu, Fengshan Ma, Jie Guo
Summary: The existence of cracks has a significant influence on the deformation failure characteristics and mechanical behavior of the surrounding rock mass. Backfill mining can effectively restrain the deformation failure of surrounding rock and reduce the occurrence of penetrating fractures. Double subsidence centers developed on the surface and the reflection of deformation on the surface showed obvious hysteresis.
Article
Energy & Fuels
Xing Li, Cheng Pan, Xiaofeng Li, Chengmeng Shao, Haibo Li
Summary: This research used a synthetic rock mass approach to study crack propagation and coalescence during underground blasting. It was found that pre-existing fractures have a restraining effect on blasting-induced crack propagation, but this effect weakens as fracture length or density increases. In addition, the mismatch between borehole centerline and high in situ stress direction also affects crack coalescence.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Review
Construction & Building Technology
Wenhao Zhang, Nan Yao, Binyu Luo, Yicheng Ye, Felix Oppong
Summary: This study conducted a direct shear experiment to investigate the mechanical properties and strength variation of ESFC with different slurry thicknesses, initial normal stresses, and fracture roughness. The results showed that increasing slurry thickness, initial normal stress, and fracture roughness enhanced the shear strength of ESFC, but their growth trends of strength were different. Additionally, ESFC with different conditions exhibited similar failure modes, primarily ladder-like distribution along the tensile fracture of the expansive slurry and the deformation of the slurry-rock interface.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Houbin Liu, Shuai Cui, Yingfeng Meng, Zhengbo Han, Mou Yang
Summary: By studying the geometric characteristics of fractures and rocks in carbonate formations, a rock strength criterion based on fractal geometry was established and applied to a borehole stability evaluation model. The experimental results show that different fracture inclinations and borehole trajectories significantly influence the collapse pressure equivalent density of the borehole wall.
Article
Engineering, Geological
Ruud Weijermars, Jihoon Wang, Tri Pham
Summary: The study investigates the impact of pressure-loaded natural fractures on wellbore stability, analyzing the instability caused by pressure fractures and the changes in fracture propagation paths.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Environmental
Guofeng Li, Mingming He, Yue Bai
Summary: In this study, the influence of various heterogeneity factors of rock mass on tunnel displacement was reviewed. The critical deformation formula was derived and a stability evaluation method was proposed using an elastoplastic analytical solution for a circular tunnel. The Sanhekou hydro-junction project was used as an example to establish a finite difference method model for heterogeneous rock mass. A new method was proposed to obtain the basic parameters and evaluate the stability of the heterogeneous rock mass tunnel. The reliability of the stability evaluation method was also verified by monitoring the 2# diversion tunnel of the Zipingpu hydraulic project.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Engineering, Geological
Jiayao Chen, Hyungjoon Seo, Chengzhan Gao, Qian Fang, Dingli Zhang, Hongwei Huang
Summary: A comprehensive method for evaluating similarity between 2D fracture maps is proposed, including five evaluation indicators and similarity calculation based on grouping matching of trace lines. The results show that grouping similarity indicators are more rigorous and suitable for engineering modeling. The proposed method effectively solves the difficulty of comprehensive distribution similarity evaluation and achieves more objective evaluation of position and density indicators. The established evaluation system is applied to real tunnel construction, improving the accuracy of fracture modeling.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Ivica Pavicic, Ivo Galic, Miso Kucelj, Ivan Dragicevic
Summary: The presented methodology is a fast and cost-effective approach for assessing rock mass characteristics, important for decision-making in quarry investment. It is also applicable to various fields such as hydrogeology, geotechnical engineering, civil engineering, and engineering geology, providing crucial information on fracture systems in the rock mass. It emphasizes the importance of proper geological investigations in the pre-quarry phase for optimal quarry location selection.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Geological
D. Gottron, A. Henk
Summary: This study compares Discrete Fracture Network (DFN) modeling with empirical relationships based on conventional engineering rock mass classifications to determine the elastic properties of fractured rock masses. The results show that incorporating intact rock properties in addition to classification scores in empirical equations yields more reliable estimates for predicting fractured rock mass properties.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Li Li, Cui Yu, Zengqiang Han, Tao Sun
IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
(2019)
Article
Engineering, Geological
Zengqiang Han, Chuanying Wang, Chao Wang, Xianjian Zou, Yuyong Jiao, Sheng Hu
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2020)
Article
Engineering, Multidisciplinary
Jin-chao Wang, Chuan-ying Wang, Zeng-qiang Han, Yi-teng Wang, Xiao-hua Huang
Article
Engineering, Multidisciplinary
Jinchao Wang, Chuanying Wang, Zengqiang Han, Yuyong Jiao, Junpeng Zou
Article
Engineering, Geological
Jinchao Wang, Chuanying Wang, Zengqiang Han, Xianjian Zou, Yiteng Wang, Chao Wang, Sheng Hu
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2020)
Article
Engineering, Multidisciplinary
Jinchao Wang, Chuanying Wang, Zengqiang Han
Article
Geosciences, Multidisciplinary
Li Li, Rui Wang, Tianxiang Peng, Jingyi Hao, Zhipeng Zhou, Zengqiang Han
Summary: Ground Penetrating Radar (GPR) is an effective tool for detecting underground structures in drilling engineering. This paper analyzes the imaging principle and uses Curvelet transform to identify geological bodies in GPR images, showing that most geological bodies can be effectively identified.
JOURNAL OF APPLIED GEOPHYSICS
(2021)
Article
Geochemistry & Geophysics
Li Li, Rui Wang, Zengqiang Han
Summary: A novel method for quantitatively calculating the relative dielectric constant of geo-bodies is proposed based on information fusion of Ground-penetrating radar (GPR) image and digital panoramic image obtained from single-hole measuring. The method extracts the structural plane tilt angle from borehole optical image and GPR image to calculate permittivity and quantify the geological medium properties, providing insight into the vertical stratification characteristics of geo-bodies. The experiment with borehole optical and GPR images reveals the continuity and discontinuity of medium change, indicating the presence of layered structures in shallow geology and simpler vertical stratification characteristics in deep geology.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Engineering, Geological
Jinchao Wang, Hanhua Xu, Wei Chen, Chuanying Wang, Zengqiang Han
Summary: This paper proposes a rock mass integrity evaluation method based on multivariate data analysis, which extracts key geological data from digital images and digital signals obtained by conventional logging methods. Compared with traditional methods, this method considers more factors that affect the stability of rock mass.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2022)
Article
Geosciences, Multidisciplinary
Jinchao Wang, Chuanying Wang, Junfeng Huang, Zengqiang Han, Wenhao Zeng, Yiteng Wang
Summary: This paper proposes a deep borehole in-situ stress measurement method based on multi-array ultrasonic scanning technology, which improves the accuracy and efficiency of deep in-situ stress measurement. A multi-array ultrasonic scanning device is developed by using the effective fusion of multi-array ultrasonic full waveform scanning signals and the reconstruction of horizontal section contour. Physical experiments verify the feasibility and accuracy of this method. The results show that the effective fusion of multi-array ultrasonic full waveform scanning signals and horizontal section contour reconstruction can provide a new technical means for the three-dimensional detection of borehole wall and in-situ stress measurement.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Ocean
Jinchao Wang, Chuanying Wang, Zengqiang Han, Yiteng Wang, Junpeng Zou
Summary: This paper presents a method for three-dimensional reconstruction and characterization of reef limestone pores using optical and acoustic microscope images. By establishing a correlation function and constructing horizontal section control points and vertical transition contours, a fine-grained three-dimensional reconstruction of the pore structure is realized. The results show the feasibility and reliability of the proposed method.
MARINE GEORESOURCES & GEOTECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Chao Wang, Zengqiang Han, Yiteng Wang, Chuanying Wang, Jinchao Wang, Shuangyuan Chen, Sheng Hu
Summary: This paper uses borehole camera technology to measure and analyze the morphological characteristics (depth, width, and orientation) of concrete cracks in a tunnel floor. The results show that the cracks have an average extension depth of over 1.195 m and the width decreases with increasing depth. The crack orientation is generally stable, with slight variations at different borehole orifices and depths. The paper also highlights the differences in crack development between two measurements taken after a 15-day interval.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Jinchao Wang, Junfeng Huang, Hui Min, Feng Wang, Yiteng Wang, Zengqiang Han
Summary: This paper presents a weak interlayer identification method based on borehole photo-acoustic combination measurement, which effectively captures the comprehensive response characteristics of the weak interlayer.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Multidisciplinary
Zengqiang Han, Minghong Li, Chao Wang, Yiteng Wang, Xiaohua Huang
Summary: This paper analyzes the structural plane information of multiple boreholes collected by the digital panoramic borehole camera system and determines the structural plane consistency through mathematical analysis methods. The method, based on digital borehole images, has been validated and can be applied to both flat structural planes and structural planes with certain undulation angles and roughness. Additionally, the tilt of the borehole does not affect the structural plane consistency using the borehole camera.
APPLIED SCIENCES-BASEL
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
L. Li, C. Yu, T. Sun, Z. Q. Han, X. J. Tang
2018 10TH IAPR WORKSHOP ON PATTERN RECOGNITION IN REMOTE SENSING (PRRS)
(2018)
