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Analytical investigations of in situ stress inversion from borehole breakout geometries

Journal of Rock Mechanics and Geotechnical Engineering 2024年第7期16卷 2375-2387页

作者： Zizhuo Xiang Taehyun Moon Joung Oh guangyao si Ismet Canbulat School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW2052Australia HNTB Corporation 3505th Ave.58th FloorNew YorkNY10118USA

This study aims to investigate the feasibility of deriving in situ horizontal stresses from the breakout width and depth using the analytical ***-three breakout data with different borehole sizes were collected and three failure criteria were *** on the Kirsch equations,relatively accurate major horizontal stress(sH)estimations from known minor horizontal stress(sh)were achieved with percentage errors ranging from 0.33%to 44.08%using the breakout *** Mogi-Coulomb failure criterion(average error:13.1%)outperformed modified Wiebols-Cook(average error:19.09%)and modified Lade(average error:18.09%)failure ***,none of the tested constitutive models could yield reasonable sh predictions from known sH using the same approach due to the analytical expression of the redistributed stress and the nature of the constitutive *** consideration of this issue,the horizontal stress ratio(sH/sh)is suggested as an alternative input,which could estimate both sH and sh with the same level of ***,the estimation accuracies for both large-scale and laboratory-scale breakouts are comparable,suggesting the applicability of this approach across different breakout *** breakout depth,conformal mapping and complex variable method were used to calculate the stress concentration around the breakout tip,allowing the expression of redistributed stresses using binomials composed of sH and ***,analysis of the breakout depth stabilisation mechanism indicates that additional parameters are required to utilise normalised breakout depth for stress estimation compared to breakout *** parameters are challenging to obtain,especially under field conditions,meaning utilising normalised breakout depth analytically in practical applications faces significant challenges and remains infeasible at this ***,the normalised breakout depth should still be considered a critical input for any empirical and statistical stres

关键词： Borehole failure In situ stress estimation In situ horizontal stress ratio Conformal mapping Complex variable method Breakout stabilisation

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NMR-based damage characterisation of backfill material in host rock under dynamic loading

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International Journal of Mining Science and Technology 2020年第3期30卷 329-335页

作者： Binglei Li Jiquan Lan guangyao si Guopeng Lin Liuqing Hu College of Zijin Mining Fuzhou UniversityFuzhou 350108China School of Minerals and Energy Resources Engineering University of New South WalesSydney 2205Australia

It is not uncommon that backfill material used in underground mining being exposed to repetitive dynamic stresses induced by blasting operations or rockburst events. Understanding the strength and fracture evolution of backfilled stopes is critical to maintain the long-term stope stability and ensure safe mining activities. This paper aims to study the damage evolution of the backfill material and its host rock behaviour under three-dimensional(3D) dynamic loading. Using a true-triaxial testing machine, multiple samples of backfill material enclosed by country rock were fabricated and tested under various dynamic loadings with different true-triaxial confining stress conditions. In addition, the nuclear magnetic resonance(NMR) measurement was conducted on the samples before and after exerting static and dynamic loading to obtain their porosity distribution changes. The experiment results suggested that with the increase of the dynamic loading, the porosity of the backfill sample goes through a two-stage process,which shows a slightly linear decrease and then followed by an exponential increase. The research findings can help understand the damage mechanism and fracture development of backfilled stopes and its host rock in deep underground mines, which are constantly subject to the combination of 3D static confining stress and dynamic loading.

关键词： Dynamic loading Backfill-country rock system True triaxial test Coupled static and dynamic loads Nuclear magnetic resonance(NMR) Damage evolution

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Fault-Induced Coal Burst Mechanism under Mining-Induced Static and Dynamic Stresses

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Engineering 2021年第5期7卷 687-700页

作者： Wu Cai Linming Dou guangyao si Yawei Hu State Key Laboratory of Coal Resources and Safe Mining School of MinesChina University of Mining and TechnologyXuzhou 221116China Department of Earth Science and Engineering Royal School of MinesImperial College LondonLondon SW72AZUK School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia

Fault is a common geological structure that has been revealed in the process of underground coal excavation and *** nature of its discontinuous structure controls the deformation,damage,and mechanics of the coal or rock *** interaction between this discontinuous structure and mining activities is a key factor that dominates fault reactivation and the coal burst it can *** paper first summarizes investigations into the relationships between coal mining layouts and fault occurrences,along with relevant conceptual models for fault ***,it proposes mechanisms of fault reactivation and its induced coal burst based on the superposition of static and dynamic stresses,which include two kinds of fault reactivations from:mining-induced quasi-static stress(FRMSS)-dominated and seismic-based dynamic stress(FRSDS)-*** two kinds of fault reactivations are then validated by the results of experimental investigations,numerical modeling,and in situ microseismic *** this basis,monitoring methods and prevention strategies for fault-induced coal burst are discussed and *** results show that fault-induced coal burst is triggered by the superposition of high static stress in the fault pillar and dynamic stress from fault *** static stress comes from the interaction of the fault and the roof structure,and dynamic stress can be ascribed to FRMSS and *** results in this paper could be of great significance in guiding the monitoring and prevention of fault-induced coal bursts.

关键词： Coal burst Fault reactivation Mining-induced stress Seismic-based dynamic stress Fault pillar

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Classification of clustered microseismic events in a coal mine using machine learning

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第6期13卷 1256-1273页

作者： Yi Duan Yiran Shen Ismet Canbulat Xun Luo guangyao si CSRIO Mineral Resources BrisbaneQLD4069Australia School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW2052Australia School of Software Shandong UniversityJinanShandong250100China

Discrimination of seismicity distributed in different areas is essential for reliable seismic risk assessment in *** machine learning has been widely applied in seismic data processing,feasibility and reliability of applying this technique to classify spatially clustered seismic events in underground mines are yet to be *** this research,two groups of seismic events with a minimum local magnitude(ML) of-3 were observed in an underground coal *** were respectively located around a dyke and the longwall ***,two types of undesired signals were also *** machine learning methods,*** forest(RF),support vector machine(SVM),deep convolutional neural network(DCNN),and residual neural network(ResNN),were used for classifying these *** results obtained based on a primary dataset showed that these seismic events could be classified with at least 91% *** DCNN using seismogram images as the inputs reached the best performance with more than 94% *** mining is a dynamic progress which could change the characteristics of seismic signals,the temporal variance in the prediction performance of DCNN was also investigated to assess the reliability of this classifier during mining.A cascaded workflow consisting of database update,model training,signal prediction,and results review was *** progressively calibrating the DCNN model,it achieved up to 99% prediction *** results demonstrated that machine learning is a reliable tool for the automatic discrimination of spatially clustered seismicity in underground mining.

关键词： Seismic event classification Clustered seismicity Machine learning Cascaded workflow Underground mining

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A novel elastoplastic model for Yunnan sandstone under poly-axial loading

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International Journal of Mining Science and Technology 2023年第7期33卷 801-814页

作者： Xu Li guangyao si Joung Oh Ismet Canbulat Rui Kong Jian Zhang School of Minerals and Energy Resources Engineering University of New South WalesSydney NSW 2052Australia Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang 110819China School of Safety Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China

The lack of understanding of plastic hardening(softening)laws,especially under anisotropic stress conditions,results in inappropriate geotechnical *** of the yielding envelopes do not consider the effect of intermediate principal stress and the influence of Lode's *** addition,the application of plastic flow rules regarding yielding surfaces compromises the softening of rock internal friction as well as the influence of Lode's angle on the plastic ***,the ductility to brittleness transition in the intermediate principal stress direction still requires a theoretical *** this study,based on poly-axial testing results of Yunnan sandstone,we adopted a failure criterion with the intermediate principal stress proposed by Menétrey and *** proposed new failure envelope was applied to capture the plastic evolution of rock samples.A plastic hardening-softening model is constructed,based on the framework of the plastic *** softening envelope is modified to better present the stress drop and considers the deterioration of rock internal friction in the post-peak stage of poly-axial *** differential of plastic potential according to the principal stresses is also modified,considering the rotation of Lode's angle in the poly-axial loading *** model results were compared with laboratory testing results,which showed great consistency across 9 different loading tests(5 under triaxial stress and 4 under poly-axial stress with 22 stress-strain curves in total).The induced brittleness by the intermediate principal stress is also well captured by the proposed model.

关键词： Elastoplastic model Rock mechanics Poly-axial stress state True-triaxial

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Frontiers in Coal-related Resources——introduction to the special issue

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Frontiers of Earth Science 2023年第1期17卷 1-3页

作者： Dameng LIU Shen JIAN Hongfei CHENG Yidong CAI guangyao si School of Energy Resource China University of GeosciencesBeijing 100083China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(Ministry of Education) China University of Mining and TechnologyXuzhou 221008China School of Earth Science and Resources Chang’an UniversityXi’an 710054China School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia

Coal-related resources, as a popular development in recent years, is the focus of research in the field of coalbed methane (CBM), coal measure gases, coal-associated rare earth resources and nonmetallic minerals (Moore, 2012;Dai and Finkelman, 2018;Qin et al., 2018). Due to its complexity in concentration, occurrence and exploitation, many key issues need to be addressed (Sayed et al., 2017;Bera et al., 2022;Liu et al., 2022).

关键词： minerals coalbed gases

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Quantitative assessment of the spatio-temporal correlations of seismic events induced by longwall coal mining

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第5期14卷 1406-1420页

作者： Shuyu Wang guangyao si Changbin Wang Wu Cai Binglei Li Joung Oh Ismet Canbulat School of Minerals and Energy Resources Engineering University of New South WalesSydney2052Australia State Key Laboratory of Coal Resources and Safe Mining School of MinesChina University of Mining and TechnologyXuzhou221116China Zijin School of Geology and Mining Fuzhou UniversityFuzhou350108China

Rock failure process as a natural response to mining activities is associated with seismic events, which can pose a potential hazard to mine operators, equipment and infrastructures. Mining-induced seismicity has been found to be internally correlated in both time and space domains as a result of rock fracturing during progressive mining activities. Understanding the spatio-temporal(ST) correlation of mininginduced seismic events is an essential step to use seismic data for further analysis, such as rockburst prediction and caving assessment. However, there are no established methods to perform this critical task. Input parameters used for the prediction of seismic hazards, such as the time window of past data and effective prediction distance, are determined based on site-specific experience without statistical or physical reasons to support. Therefore, the accuracy of current seismic prediction methods is largely constrained, which can only be addressed by quantitively assessing the ST correlations of mininginduced seismicity. In this research, the ST correlation of seismic event energy collected from a study mine is quantitatively analysed using various statistical methods, including autocorrelation function(ACF), semivariogram and Moran’s I analysis. In addition, based on the integrated ST correlation assessment, seismic events are further classified into seven clusters, so as to assess the correlations within individual clusters. The correlation of seismic events is found to be quantitatively assessable, and their correlations may vary throughout the mineral extraction process.

关键词： Spatial correlation Temporal correlation Autocorrelation function(ACF) Semivariogram Scale of fluctuation

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巷道围岩调热圈分布特性研究:以羊场湾煤矿为例

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中国安全科学学报 2023年第8期33卷 125-133页

作者：张健张鹏妍魏建平 si guangyao 许博许振国河南理工大学安全科学与工程学院河南焦作454003 河南理工大学河南省瓦斯地质与瓦斯治理重点实验室河南焦作454003 煤炭安全生产与清洁创新高效利用省部共建协同创新中心河南焦作454003 新南威尔士大学矿业与能源资源学院澳大利亚悉尼NSW 2052

为了研究矿井巷道围岩温度场的分布情况,首先在羊场湾煤矿13采区回风下山937高程附近,利用深孔测温技术测定围岩温度,同时测定具有代表性的岩石热物性参数;然后利用COMSOL软件建立数值模型,模拟巷道围岩的温度场;最后通过改变通风时间... 详细信息

为了研究矿井巷道围岩温度场的分布情况,首先在羊场湾煤矿13采区回风下山937高程附近,利用深孔测温技术测定围岩温度,同时测定具有代表性的岩石热物性参数;然后利用COMSOL软件建立数值模型,模拟巷道围岩的温度场;最后通过改变通风时间和风流特性,分析其对该巷道调热圈温度场的影响。结果表明:通过深孔测温可知该巷道原始岩温为28.3℃,调热圈半径为32 m;通过数值模拟可知:其调热圈半径为30.9 m,与实测结果误差为3.4%。随着巷道通风时间的延长,围岩的扰动范围不断增加,围岩温度不断降低,且温度降低速率逐渐变缓;随着风流温度的降低,围岩温度也逐渐下降,且越靠近巷壁的围岩受风流温度的影响越明显;随着风流速度的增大,围岩温度会逐渐下降,当风速大于4 m/s时,围岩温度趋于稳定。

关键词：巷道围岩调热圈温度场深孔测温热物性参数数值模拟

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国内外煤层气利用现状及前景展望

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中国煤层气 2009年第2期6卷 44-46页

作者：司光耀蔡武张强中国矿业大学矿业工程学院江苏221008

煤层气(瓦斯)长期以来被人们视作危害煤矿安全的有害气体,然而随着近年来爆发的能源危机,人们对煤层气的认识也逐渐改变。煤层气作为一种高效、清洁的能源,其中蕴藏着巨大的经济、环境利益。我国的煤层气储量非常丰富,有着十分广阔的应... 详细信息

煤层气(瓦斯)长期以来被人们视作危害煤矿安全的有害气体,然而随着近年来爆发的能源危机,人们对煤层气的认识也逐渐改变。煤层气作为一种高效、清洁的能源,其中蕴藏着巨大的经济、环境利益。我国的煤层气储量非常丰富,有着十分广阔的应用前景,然而由于我国煤层气工业起步较晚,距欧美等发达国家仍有一定差距,正确认识国内外煤层气利用现状,有助于我们加快对煤层气的合理利用,有助于解决我国的能源问题。

关键词：煤层气利用现状前景

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关于某轴流压缩机叶片榫头的失效分析

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热加工工艺 2022年第8期51卷 151-154页

作者：蔡文冬邬瓦尼黄华政刘畅司光耀赵伟四川航天技术研究院第七设计部四川成都610100

某轴流压缩机试运行过程中因人为操作失误,风量倒灌。检修中经磁粉探伤发现在16级转子中有12片动叶在榫头圆角处产生裂纹,且在榫槽配合面存在着磨损、烧伤痕迹等缺陷。通过显微观察、能谱分析、金相观察及力学性能测试,对缺陷产生的原... 详细信息

某轴流压缩机试运行过程中因人为操作失误,风量倒灌。检修中经磁粉探伤发现在16级转子中有12片动叶在榫头圆角处产生裂纹,且在榫槽配合面存在着磨损、烧伤痕迹等缺陷。通过显微观察、能谱分析、金相观察及力学性能测试,对缺陷产生的原因进行分析。结果表明:风量倒灌致使叶片振动应力过大,加之叶片材料力学性能未达标准,使得榫头圆角处产生应力集中,从而导致叶片榫头裂纹的萌生;而磨损、烧伤痕迹是叶片异常高频振动导致榫槽配合面出现微动磨损的结果。

关键词：轴流压缩机叶片榫头失效分析应力集中微动磨损

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