|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | An assessment of coal pillar system stability criteria based on a mechanistic evaluation of the interaction between coal pillars and the overburden显示文摘Coal pillar design has historically assigned a factor of safety(Fo S) or stability factor(SF) according to their estimated strength and the assumed overburden load acting on them. Acceptable Fo S values have been assigned based on past mining experience or a statistical link between Fo S and probability of failure(Po F). Pillar width-to-height(w/h) ratio has long been established as having a material influence on both pillar strength and its potential failure mode. However, there has been significant disagreement on using both factor of safety(Fo S) and w/h as part of pillar system stability criterion, as compared to using Fo S in isolation. This paper will argue that there are valid technical reasons to bring w/h ratio into system stability criteria(other than its influence on pillar strength), as it is related to the post-failure stiffness of the pillar, as measured in situ, and its interaction with overburden stiffness. When overburden stiffness is also brought into pillar system stability considerations, two issues emerge. The first is the width-todepth(W/D) ratio of the panel and whether it is sub-critical or super-critical from a surface subsidence perspective. The second relates to a re-evaluation of pillar Fo S based on whether the pillar is in an elastic or non-elastic(i.e., post-yield) state in its as-designed condition, as this is relevant to maintaining overburden stiffness at the highest possible level. The significance of the model is the potential to maximise both reserve recovery and mining efficiencies without any discernible increase in geotechnical risk, particularly in thick seams and higher depth of cover mining situations. At a time when mining economics are, at best, marginal, removing potentially unnecessary design conservatism is of interest to all mine operators and is an important topic for discussion amongst the geotechnical community. | Reed Guy Mctyer Kent Frith Russell | 2017 | International Journal of Mining Science and Technology2017，27，1： | 21 |
| 2 | Fundamental principles of an effective reinforcing roof bolting strategy in horizontally layered roof strata and areas of potential improvement显示文摘It is arguable that the development of reinforcing roof bolting systems has largely stagnated in recent times, primarily due to the prevailing industry view that few, if any, further improvements can be made to what currently exists.However, this paper contends that reinforcing roof bolting systems can be further refined by considering both the specific manner by which horizontally bedded roof strata loses its natural self-supporting ability and the specific means by which reinforcing roof bolts act to promote or retain this natural self-supporting ability.The Australian coal industry has insisted on minimising bolt-hole diameter to maximise load transfer and on targeting full-encapsulation by any means necessary for many years.This has led to a significant, albeit unintended, consequence in terms of overall roof bolting effectiveness, namely increased resin pressures during bolt installation and the associated potential for opening bedding planes that may have, otherwise, remained closed during the bolt installation process.Given that the natural self-supporting ability of roof strata is strongly linked to whether bedding planes are open or closed, logically, minimising resin pressures should be a significant benefit.This paper focuses primarily on three key issues that relate directly to the function of the roof bolting system itself:(1) the importance of proper resin mixing in the context of maximising load transfer strength and stiffness,(2) the importance of minimising resin pressures developed during bolt installation, and(3) the importance of maximising the effectiveness of the available bolt pre-tension.All mine operators should be invested in improving the individual effectiveness of each installed roof bolt, even by relatively small incremental amounts, so this is an important topic for discussion within the mining community. | Russell Frith Guy Reed Martin McKinnon | 2018 | International Journal of Mining Science and Technology2018，28，1： | 7 |
| 3 | A holistic examination of the load rating design of longwall shields after more than half a century of mechanised longwall mining显示文摘It is a commonly asked question:how big should the longwall shields be? The answer is a key aspect of a longwall mining feasibility study when the consequences of inadequately rated shields are considered.This paper addresses this question based on the measured nature of the loading environment in which shields are required to operate,the various geological and geometrical controls of that environment and the various links between their load rating,a range of other relevant shield design factors and the loss event they are required to prevent a major roof collapse on the longwall face.The paper concludes that despite the tremendous advances that have been made in shield design and load rating over the past50 years,the same drivers that caused longwall miners of the past to seek improved roof control on the longwall face via the use of ever-higher rated shields,are still as relevant today.However at the current time,the limits of the largest available longwall shields have yet to be tested,therefore industry focus for the foreseeable future should possibly be in achieving the maximum level of roof control on the face via their optimum operational use rather than considering further shield rating increases and incurring the inevitable downsides in terms of capital cost and shield weight. | Frith Russell C. | 2015 | International Journal of Mining Science and Technology2015，25，5： | 6 |
| 4 | A causation mechanism for coal bursts during roadway development based on the major horizontal stress in coal:Very specific structural geology causing a localised loss of effective coal confinement and Newton’s second law显示文摘In 2017,one of the international authorities on coal bursts,Mark Christopher,published a paper entitled'Coal bursts that occur during development:A rock mechanics enigma',in which several relevant technical issues were identified.This paper outlines what is considered to be a credible,first-principles,mechanistic explanation for these three current development coal burst conundrums by reference to early published coal testing work examining the significance of a lack of'constraint'to coal stability and an understanding of how very specific structural geology and other geological features can logically cause this to occur in situ,albeit on a statistically very rare basis.This basic model is examined by reference to published information pertaining to the development coal-burst that occurred at the Austar Coal Mine in New South Wales,Australia,in 2014 and from the Sunnyside District in Utah,the United States.The'cause and effect'model for development of coal bursts presented also offers a meaningful explanation for the statistical improbability for what are nonetheless potentially highly-destructive events,being able to explain the statistical rarity being just as important to the credibility of the model as explaining the local conditions associated with burst events.The model could also form the basis for a robust,riskbased approach utilising a'hierarchy of controls',to the operational management of the development coal burst threat.Specifically,the use of pre-mining predictions for likely burst-prone and non-burstprone areas,the use of the mine layout to avoid or at least minimise mining within burst-prone areas if appropriate,and finally the development of an operational Trigger Action Response Plan(TARP)that reduces the likelihood of inadvertent roadway development into a burst-prone area without suitable safety controls already being in place. | Russell Frith Guy Reed Aaron Jones | 2020 | International Journal of Mining Science and Technology2020，30，1： | 3 |
| 5 | 食物蛋白诱导性小肠结肠炎综合征:一项基于澳大利
亚普通人群的研究,2012-2014显示文摘背景 食物蛋白诱导性小肠结肠炎综合征(FPIES)是一种非IgE 介导的胃肠道过敏性疾病。基于大规模人群的FPIES 流行病学调查尚无报道。目的 本文拟明确澳大利亚婴幼儿中FPIES 的发病率和临床特点。方法 2012 至2014年通过澳大利亚儿科监测体系开展了一项全国范围内的调查,由1 400 名儿科医生每月上报2 岁以下的婴幼儿中诊为急性FPIES 的新病例。结果 230 例患儿被诊为FPIES。FPIES 在澳大利亚2 岁以下儿童中的发病率为15.4/(10 万·年)。首次发作、诊断及上报的中位数年龄分别为5、7 和10 月龄。发病没有性别倾向性。7% 的患儿有兄弟姐妹也患有FPIES,5% 在纯母乳喂养期间发病。68 例患儿仅对单种食物过敏(20% 对2 种食物过敏,12% 对3 种以上食物过敏)。最常见的FPIES 诱因是大米(45%)、牛奶(33%)以及鸡蛋(12%)。51% 的患儿在首次暴露时即有过敏反应。与单种食物过敏相比,多种食物过敏者的首次发病年龄更小(均数分别为4.6 和5.8 月龄,P = 0.001),更容易有水果或蔬菜过敏(P < 0.000 1)。纯母乳喂养4 个月以上的婴儿更不易发生多种食物过敏性FPIES(P = 0.06)。对包括牛奶在内的多种食物过敏的FPIES 患儿中64% 同时对固体食物过敏。42% 鱼类过敏性FPIES 患儿并发其他食物过敏。结论 FPIES并不罕见,估计发病率为15.4/(10 万·年)。大米是澳大利亚最常见的食物诱因。与多重食物过敏性FPIES 相关的危
险因素包括早期起病、对水果或蔬菜不能耐受。 | Sam Mehr FRACP, Katie Frith FRACP Elizabeth H. Barnes BAppSc MStat and Dianne E Campbell | 2018 | 中华临床免疫和变态反应杂志2018，12，1： | 2 |
| 6 | 食物过敏治疗显示文摘IgE 介导的食物过敏患病率在全世界范围内呈升高趋势,已成为困扰数以百万计患者的公共健康问题。但目前的标准治疗方案仅为严格禁食过敏食物及含过敏食物成分的食品,尚无已经审批认证的食物过敏治疗方法。目前已有大量的有关不同形式食物免疫治疗的研究,包括口服、舌下及经皮给药途径。尽管口服免疫治疗因蛋白摄入量最大而疗效最肯定,但与舌下免疫治疗及经皮免疫治疗相比耐受性较差,不良反应重,发生率也较高。经皮免疫治疗虽然疗效相对最弱,但安全性及耐受性最佳。很多研究通过尝试添加佐剂和anti-IgE 提高食物免疫治疗的疗效及安全性。此外还有许多超前于这些第一代食物免疫治疗方法的新概念疗法尚处于动物试验或早期I 期临床试验阶段。 | Sam Mehr Katie Frith Elizabeth H.Barnes BAppSc MStat Dianne E.Campbell 王子熹 王良录 | 2018 | 中华临床免疫和变态反应杂志2018，12，1： | 2 |
| 7 | Coal pillar design when considered a reinforcement problem rather than a suspension problem显示文摘Current coal pillar design is the epitome of suspension design.A defined weight of unstable overburden material is estimated, and the dimensions of the pillars left behind are based on holding up that material to a prescribed factor of safety.In principle, this is no different to early roadway roof support design.However, for the most part, roadway roof stabilisation has progressed to reinforcement, whereby the roof strata is assisted in supporting itself.This is now the mainstay of efficient and effective underground coal production.Suspension and reinforcement are fundamentally different in roadway roof stabilisation and lead to substantially different requirements in terms of support hardware characteristics and their application.In suspension, the primary focus is the total load-bearing capacity of the installed support and ensuring that it is securely anchored outside of the unstable roof mass.In contrast, reinforcement recognises that roof de-stabilisation is a gradational process with ever-increasing roof displacement magnitude leading to ever-reducing stability.Key roof support characteristics relate to such issues as system stiffness, the location and pattern of support elements and mobilising a defined thickness of the immediate roof to create(or build) a stabilising strata beam.The objective is to ensure that horizontal stress is maintained at a level that prevents mass roof collapse.This paper presents a prototype coal pillar and overburden system representation where reinforcement, rather than suspension, of the overburden is the stabilising mechanism via the action of in situ horizontal stresses.Established roadway roof reinforcement principles can potentially be applied to coal pillar design under this representation.The merit of this is evaluated according to failed pillar cases as found in a series of published databases.Based on the findings, a series of coal pillar system design considerations for bord and pillar type mine workings are provided.This potentially allows a more flexible approach to coal pillar sizing within workable mining layouts, as compared to common industry practice of a single design factor of safety(Fo S) under defined overburden dead-loading to the exclusion of other relevant overburden stabilising influences. | Russell Frith Guy Reed | 2018 | International Journal of Mining Science and Technology2018，28，1： | 2 |
| 8 | Incidence of migraine relative to menstrual cycle phases of rising and falling estrogen显示文摘 | E A. MacGregor A Frith J Ellis L Aspinall A Hackshaw | 2006 | Neurology2006，，12： | 2 |
| 9 | Why do autistic individuals show superior performance on the block design task显示文摘 | SHAH A FRITH U | 1993 | J Child Psychol Psychiatry1993，34，： | 1 |
| 10 | Reward value of attractiveness and gaze显示文摘 | Kampe KK Frith CD Dolan R J | 2001 | Nature2001，413，： | 1 |
| 11 | Finding functional sequence elements by multiple local alignments 显示文摘 | FRITH M C HANSEN U SPOUGE J L | 2004 | Nucleic Acids Res2004，32，： | 1 |
| 12 | Animal models of trauma-induced coagulopathy显示文摘 | Frith D Cohen MJ Brohi K | 2012 | Thromb Res2012，129，5： | 1 |
| 13 | The painful side of empathy 显示文摘 | Singer T Frith C | 2005 | Nature Neuroscience2005，8，： | 1 |
| 14 | Theory of Mind and Social Impairment in Children with Conduct Disorder 显示文摘 | Happe F G E Frith U | 1996 | British Journal of Developmental Psychology1996，14，： | 1 |
| 15 | Autism: Beyond ' Theory of Mind' 显示文摘 | FRITH U HAPPE F | 1994 | Cognition1994，50，13： | 1 |
| 16 | The neurocognitive basis of autism显示文摘 | Frith U | 1997 | Trends in Cognitive Science1997，2，1： | 1 |
| 17 | WxMoyCzS2 nanotubes显示文摘 | Zhu Y Q Frith S | 2001 | Carbon2001，39，： | 1 |
| 18 | Differential Involvement of Regions of Rostral Prefron tal Cortex (Brodmann area 10) in Time and Event based Prospective Memory显示文摘 | Okuda J Fujii T Obtake H Tsukiura T Yamadori A Frith C D | 2007 | International Journal of Psycbopbysiology2007，64，3： | 1 |
| 19 | A self- management approach using self- initiated action plans for symptoms with ongoing nurse support in patients with Chronic Obstructive Pulmonary Disease (COPD) and co- morbidities : The COPE - III study protocol 显示文摘 | Lenferink A Frith P van der Valk P | 2013 | Contemp Clin Trials2013，36，1： | 1 |
| 20 | Definition and driv- ers of acute traumatic coagulopathy: clinical and experi- mental investigations 显示文摘 | Frith D Goslings JC Gaarder C | 2010 | J Thromb Haemost2010，8，9： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员