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Non-linear elastic behavior and constitutive model of coal during compression and its application
Springer Science and Business Media LLC - Tập 8 - Trang 1-22 - 2022
XianJie Hao, WeiSheng Du, Peng Lin, YaoDong Jiang, JiShan Liu, GuangHui Zhao, YingNan Wei, ZhuoWen Sun
The widely distributed fracture system in coal results in significant non-linear characteristics in the compaction stage during the compression process. This stage occupies one-third of the entire compression process of coal, and is a key stage in the coal compression process. A non-linear elastic model based on the hyperbola was established to investigate the axial and lateral deformation of coal...... hiện toàn bộ
The mechanism of hysteretic ground settlement caused by shield tunneling in mixed-face conditions
Springer Science and Business Media LLC - Tập 4 Số 1 - Trang 51-61 - 2018
Ming Gao, Zhi long Zhang, Zhi qiang Qiu, Chuan Xu, Jian Zhao
Discrete element method simulation of the growth and efficiency of multiple hydraulic fractures simultaneously-induced from two horizontal wells
Springer Science and Business Media LLC - - 2021
Di Kang, Yingchun Li, Wendong Yang
Study on permeability evolution mechanism of aquifer coal seam roof sandstone under plastic flow
Springer Science and Business Media LLC - Tập 7 - Trang 1-22 - 2021
Jingna Guo, Qi Zhang, Qiang Li, Zhanqing Chen
The plastic zone of the roof surrounding rock continues to expand after the coal seam mining. The permeability of the surrounding rock under plastic flow is a basic project for water inrush prevention in coal mine. In this work, the permeability experiments were carried out on roof sandstone from Xiaojihan No.2 coal seam under three loading paths. The variations of permeability affected by the con...... hiện toàn bộ
New permeability model of deep coal rock considering the structure and 3D stress compression-induced anisotropy
Springer Science and Business Media LLC - Tập 8 - Trang 1-20 - 2022
Jianhua Li, Heping Xie, Jun Lu, Mingzhong Gao, Bobo Li, Yan Wu
Understanding the gas flow behavior in coal mining is conducive to the efficient production of coalbed methane. In coal mining, in-situ stress usually manifests as three-dimensional anisotropy in deep formations, and affects the gas permeability in reservoirs. In this work, a permeability model for anisotropic coal by combining gas sorption effects and the three-dimensional stress compression was ...... hiện toàn bộ
Stress threshold identification of progressive fracturing in Bukit Timah granite under uniaxial and triaxial stress conditions
Springer Science and Business Media LLC - Tập 2 Số 4 - Trang 301-330 - 2016
B. Lee, T.D. Rathnaweera
A new method for threshold determination of gray image
Springer Science and Business Media LLC - Tập 6 - Trang 1-13 - 2020
Jiang-Feng Liu, Xu-Lou Cao, Jerry Xu, Qiang-Ling Yao, Hong-Yang Ni
The determination of the gray threshold is crucial for the quantitative characterization of digital images. In this study, a new algorithm is proposed to determine the optimal image segmentation threshold. This algorithm is based on a combined analysis of the gray distribution curve and its second differential distribution curve of the digital image. Then, the feasibility and accuracy of the Liu–C...... hiện toàn bộ
Modelling of fatigue damage in granitic rock by piezoelectric effect in quartz phase due to alternating current excitation
Springer Science and Business Media LLC - Tập 9 - Trang 1-13 - 2023
Timo Saksala, Arturo Rubio Ruiz, Reijo Kouhia, Alexandre Kane, Mikko Hokka
This paper considers numerical modelling of hypothetical fatigue damage in granitic rock by alternating current (AC) excitation of piezoelectric properties of Quartz. For this end, a numerical method consisting of a rock mineral mesostructure model, an implicit time stepping scheme to solve the piezoelectro-mechanical problem, and a fatigue damage model was developed. The rock material was assumed...... hiện toàn bộ
Investigation on the influence coupling drilling fluid and formation boundary on acoustic wave propagation in drill string
Springer Science and Business Media LLC - Tập 6 - Trang 1-14 - 2020
Tianshou Ma, Jiayan Zou, Ping Chen, Haosheng Liu
Acoustic transmission along the drill string for measurement while drilling (MWD) is an effective solution to the problem of the low transmission rate that results from mud pulse transmission. However, the actual downhole acoustic waves are affected by many factors, such as drilling fluid properties and, formation boundaries, and their effects on acoustic wave transmission in drill string are not ...... hiện toàn bộ
Numerical assessment of the pressure relief effect of the hydraulic punching cavitation technique in a soft coal seam
Springer Science and Business Media LLC - Tập 8 - Trang 1-18 - 2022
Wei Wang, Gang Wang, Wei Zhao, Liang Wang, Zhongkai Feng, Ran Cui, Feng Du
With the increasing demand for geo-energy, the safe and efficient exploitation of deep coal resources has become increasingly important. However, the high geo-stress in the deep ground makes coal soft, which is characterised by poor permeability, high gas content, high pressure and high risk of outburst. It is difficult to drain gas from soft coal seams using traditional gas drainage methods, and ...... hiện toàn bộ
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