|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Ground response to high horizontal stresses during longwall retreat and its implications for longwall headgate support显示文摘Roof falls in longwall headgate can occur when weak roof and high horizontal stress are present. To prevent roof falls in the headgate under high horizontal stress, it is important to understand the ground response to high horizontal stress in the longwall headgate and the requirements for supplemental roof support. In this study, a longwall headgate under high horizontal stress was instrumented to monitor stress change in the pillars, deformations in the roof, and load in the cable bolts. The conditions in the headgate were monitored for about six months as the longwall face passed by the instrumented site.The roof behavior in the headgate near the face was carefully observed during longwall retreat.Numerical modeling was performed to correlate the modeling results with underground observation and instrumentation data and to quantify the effect of high horizontal stress on roof stability in the longwall headgate. This paper discusses roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary. | Peter Zhang Dave Gearhart Mark Van Dyke Daniel Su Essie Esterhuizen Berk Tulu | 2019 | International Journal of Mining Science and Technology2019，29，1： | 6 |
| 2 | 基于钢轨应变监测的多跨铁路简支梁桥桥墩差异沉降识别显示文摘旨在建立基于钢轨应变监测的多跨铁路简支梁桥桥墩差异沉降识别方法。首先,针对对称转角沉降模式的分析表明钢轨与梁体竖向变形具有一致性,为建立沉降致钢轨应变与桥墩差异沉降关系方程奠定了基础。其次,采用空间梁单元、实体单元、弹簧单元,结合主从自由度耦合技术,建立了某4跨铁路简支梁桥的钢轨-梁体-桥墩有限元模型。基于该模型的分析表明,轨底可测应变与桥墩差异沉降间存在显著正比例线性关系且应变绝对变化量可测。然后,通过理论推导,得到了沉降致钢轨应变与简支梁桥桥墩差异沉降量之间的解析表达式。解析式物理意义明确,表达形式简单。最后,对解析解与数值解进行了对比分析,两者变化趋势相同,解析解因未考虑外围钢轨约束、下部梁体弯曲变形等,所得结果略大于数值解。 | 王少杰 徐赵东 李舒 Shirley Dyke | 2016 | 铁道学报2016，38，3： | 5 |
| 3 | Evaluation of seismic potential in a longwall mine with massive sandstone roof under deep overburden显示文摘A recent seismic event was recorded by a deep longwall mine in Virginia at 3.7 ML on the local magnitude scale and 3.4 MMS by the United States Geological Survey(USGS) in 2016.Further investigations by the National Institute for Occupational Safety and Health(NIOSH) and Coronado Coal researchers have shown that this event was associated with geological features that have also been associated with other, similar seismic events in Virginia.Detailed mapping and geological exploration in the mining area has made it possible to forecast possible locations for future seismic activity.In order to use the geology as a forecaster of mining-induced seismic events and their energy potential, two primary components are needed.The first component is a long history of recorded seismic events with accurately plotted locations.The second component is a high density of geologic data within the mining area.In this case, 181 events of 1.0 MLor greater were recorded by the mine's seismic network between January, 2009, and October, 2016.Within the mining area, 897 geophysical logs, 224 core holes, and 1031 fiberscope holes were examined by mine geologists.From this information, it was found that overburden thickness, sandstone thickness, and sandstone quality contributed greatly to seismic locations.After the data was analyzed, a pattern became apparent indicating that the majority of seismic events occurred under specific conditions.Three forecast maps were created based on geology of previous seismic locations.The forecast maps have shown an accuracy of within 74%–89% when compared to the recorded 181 events that were1.0 MLor greater when considering three major geological criteria of overburden thickness of 579.12 m or greater, 6.096–12.192 m of sandstone within 15.24 m of the Pocahontas number 3 seam, and a longwall caving height of 4.572 m or less. | Mark A.Van Dyke Wen H.Su Joe Wickline | 2018 | International Journal of Mining Science and Technology2018，28，1： | 5 |
| 4 | Analysis of gateroad stability at two longwall mines based on field monitoring results and numerical model analysis显示文摘Coal mine longwall gateroads are subject to changing loading conditions induced by the advancing longwall face. The ground response and support requirements are closely related to the magnitude and orientation of the stress changes, as well as the local geology. This paper presents the monitoring results of gateroad response and support performance at two longwall mines at a 180-m and 600-m depth of cover.At the first mine, a three-entry gateroad layout was used. The second mine used a four-entry, yieldabutment-yield gateroad pillar system. Local ground deformation and support response were monitored at both sites. The monitoring period started during the development stage and continued during first panel retreat and up to second panel retreat. The two data sets were used to compare the response of the entries in two very different geotechnical settings and different gateroad layouts. The monitoring results were used to validate numerical models that simulate the loading conditions and entry response for these widely differing conditions. The validated models were used to compare the load path and ground response at the two mines. This paper demonstrates the potential for numerical models to assist mine engineers in optimizing longwall layouts and gateroad support systems. | Gabriel S.Esterhuizen David F.Gearhart Ted Klemetti Heather Dougherty Mark van Dyke | 2019 | International Journal of Mining Science and Technology2019，29，1： | 5 |
| 5 | 磁流变阻尼器的半主动控制及实时混合模拟试验研究显示文摘磁流变阻尼器作为一种比较典型的半主动控制元件,具有构造简单、响应速度快、耐久性好、阻尼力大且连续可调等优点。即使地震中能源中断,磁流变阻尼器仍可以作为被动耗能装置继续工作发挥作用,可靠性高。设计合理有效的磁流变阻尼器半主动控制方法,对于整体结构的减震效果尤其重要。提出一种改进的磁流变阻尼器的半主动控制策略-改进的Bang-Bang控制策略,对装有磁流变阻尼器的减震控制3层框架结构进行了一系列的实时混合模拟试验,对多种半主动控制方法下的振动控制效果进行试验分析。试验结果表明:磁流变阻尼器对框架结构的减震效果显著,并验证了提出的磁流变阻尼器半主动控制策略的有效性。 | 李歆 吕西林 Shirley Dyke | 2018 | 世界地震工程2018，34，4： | 5 |
| 6 | 从荷兰和瑞典的档案看十八世纪50年代至70年代的广州帆船贸易显示文摘在荷兰和瑞典的档案馆内收藏有关十八世纪 5 0年代至 70年代广州帆船贸易的重要资料 。 | 范岱克(Paul A.Van Dyke) 丁峻 | 2002 | 广东社会科学2002，，4： | 4 |
| 7 | Transitional geology and its effects on development and longwall mining in Pittsburgh Seam显示文摘This paper presents the geologic and ground control challenges that were encountered by Consol Energy's coal mining operations in southwestern Pennsylvania,USA. Geologic encounters,such as sandstoneto-limestone geology transition,massive sandstone channels,shale channels,pyritic rich green claystone,laminated roof,and soft floor,have significantly impacted the development and longwall mining in Consol's Pittsburgh Seam coal mines. Experience from different mines shows that,in the sandstone-to-limestone geology transition zone,1.83 m high-tension,fully-grouted primary bolts employed along with 4.88 m center cable bolts at every other strap greatly improved beam building and ensured proper anchorage into the competent roof. Hydraulic fracturing of the massive sandstone was often necessary to enhance caving of the massive sandstone behind the shields to relieve pressure at the face. The presence of soft floor coupled with presence of thick floor coal and deep cover,induced excessive headgate convergence during retreat of the first right hand longwall panel. In all,it is important to explore the roof and in-seam geology in detail to delineate normal and anomalous geologic conditions prior to and during development. With diligent geologic reconnaissance,geotechnical monitoring,and assessment,site-specific geotechnical solutions have been provided to mine operations to improve safety and productivity. | Lu Jun Van Dyke Mark Su Daniel W.H. Hasenfus Greg | 2016 | International Journal of Mining Science and Technology2016，26，1： | 3 |
| 8 | 飞机航电设备的半主动磁流变控制显示文摘本文提出一种新的航电设备减振控制策略,采用半主动磁流变阻尼器与小阻尼柔性橡胶支座来取代目前采用高阻尼刚性橡胶支座的方法,以降低对航电设备的耐振要求,增强飞机飞行的安全性。本文建立了航电设备减振控制的两自由度刚体平-扭耦联模型,荷载激励考虑了基底平动与转动加速度。磁流变阻尼器的半主动控制算法选用限幅最优控制算法,主控制器为H2/LQG控制器,并采用一种加速度反馈的控制策略。针对目前的被动控制方案,本文研究了支座阻尼对减振控制效果的影响。为了得到最优的半主动控制效果,本文对控制器的权矩阵进行了参数优化分析。文中针对一系列工况详细比较了本文所提出的半主动控制策略与目前被动控制策略的减振控制效果。仿真分析结果表明,磁流变阻尼器可以非常有效地减小航电设备的动力反应,新的减振控制策略远优于现有的被动控制方案。 | 谭平 Shirley J Dyke | 2007 | 地震工程与工程振动2007，27，6： | 3 |
| 9 | Phenomenological Model for Magnetorheological Dampers显示文摘 | B. F. Spencer Jr. S. J. Dyke M. K. Sain J. D. Carlson | 1997 | Journal of Engineering Mechanics1997，，3： | 3 |
| 10 | Sorghum and millet phenols and antioxidants显示文摘 | Linda Dykes Lloyd W. Rooney | 2006 | Journal of Cereal Science2006，，3： | 2 |
| 11 | Endoscopic and Radiographic Evaluation of the Small Bowel in 2012显示文摘 | Charles E. Dye Ryan R. Gaffney Thomas M. Dykes Matthew T. Moyer | 2012 | The American Journal of Medicine2012，，12： | 2 |
| 12 | Practice Parameters for the Management of Anal Fissures (3rd Revision)显示文摘 | W. Brian Perry Sharon L. Dykes W. Donald Buie Janice F. Rafferty | 2010 | Diseases of the Colon & Rectum2010，，8： | 2 |
| 13 | Modeling and control of magnetorheological dampers forseismic response reduction 显示文摘 | DYKE S J SPENCER B F SAIN M K CARLSON J D | 1996 | Smart Materials and Structures1996，5，5： | 2 |
| 14 | A case study of the stability of a non-typical bleeder entry system at a U.S.longwall mine显示文摘Longwall abutment loads are influenced by several factors,including depth of cover,pillar sizes,panel dimensions,geological setting,mining height,proximity to gob,intersection type,and size of the gob.How does proximity to the gob affect pillar loading and entry condition?Does the gob influence depend on whether the abutment load is a forward,side,or rear loading?Do non-typical bleeder entry systems follow the traditional front and side abutment loading and extent concepts?If not,will an improved understanding of the combined abutment extent warrant a change in pillar design or standing support in bleeder entries?This paper details observations made in the non-typical bleeder entries of a moderate depth longwall panel—specifically,data collected from borehole pressure cells and roof extensometers,observations of the conditions of the entries,and numerical modeling of the bleeder entries during longwall extraction.The primary focus was on the extent and magnitude of the abutment loading experienced due to the extraction of the longwall panels.Due to the layout of the longwall panels and bleeder entries,the borehole pressure cells(BPCs)and roof extensometers did not show much change due to the advancing of the first longwall.However,they did show a noticeable increase due to the second longwall advancement,with a maximum of about 4 MPa of pressure increase and 5mmof roof deformation.The observations of the conditions showed little to no change from before the first longwall panel extraction began to when the second longwall panel had been advanced more than 915 m.Localized pillar spalling was observed on the corners of the pillars closest to the longwall gob as well as an increase in water in the entries.In addition to the observations and instrumentation,numerical modeling was performed to validate modeling procedures against the monitoring results and evaluate the bleeder design.ITASCA Consulting Group’s FLAC3D numerical modeling software was used to evaluate the bleeder entries.The results of the models indicated only a minor increase in load during the extraction of the longwall panels.These models showed a much greater increase in stress due to the development of the gateroad and bleeder entries--about 80%development and 20%longwall extraction.The FLAC3D model showed very good correlation between modeled and expected gateroad loading during panel extraction.The front and side abutment extent modeled was very similar to observations from this and previous panels. | T.M.Klemetti M.A.Van Dyke I.B.Tulu D.Tuncay | 2020 | International Journal of Mining Science and Technology2020，30，1： | 2 |
| 15 | 基于应变监测的连续梁支承差异沉降识别显示文摘首先,运用基本力学原理,以三跨相等连续梁为对象,推导了梁体应变改变量与支承差异沉降量之间的解析式;并以某刚性轻轨桥为例,证明了微小支承差异沉降导致的应变改变量是可测的。其次,通过三跨不等连续梁模型试验,采用顶升方法模拟差异沉降,深入分析了梁底应变改变量与顶升量之间的关系,同时验证了FBG新型传感器的优越性能。再次,推导了与试验模型对应的梁底应变改变量与桥墩差异沉降之间的关系式,对两种模式(边墩顶升、中墩顶升)在不同差异沉降下的理论解与试验测试结果进行比较分析,结果表明二者吻合程度较高。最后,对识别基本流程与策略作了简要叙述。 | 王少杰 徐赵东 李舒 王凯洋 Dyke Shirley J | 2016 | 吉林大学学报(工学版)2016，46，4： | 2 |
| 16 | The use of crevicular prostaglandin E2 levels as a predictor of periodontal attachment loss 显示文摘 | Offenbaeher S Odle B Van Dyke T | 1986 | Journal of Periodontal Research1986，21，2： | 1 |
| 17 | The evolutionary radiation of modern birds (Neomithes):Reconciling molecules,morphology and the fossil record显示文摘 | Dyke G J Tuinen M V | 2004 | Zoological Journal of the Linnean Society2004，141，： | 1 |
| 18 | Phenomenological Model of a Magnetorheological Dampers 显示文摘 | Spencer Jr B F Dyke S J | 1997 | ASCE Journal of Engineer- ing Mechanics1997，123，3： | 1 |
| 19 | Randomized study of nasal continuous positive airway pressure in the preterm infant with respiratory distress syndrome显示文摘 | Tooley J Dyke M | 2003 | Acta Paediatr2003，92，10： | 1 |
| 20 | Semiactive control strategies for MR dampers: comparative study 显示文摘 | Jansen L M Dyke S J | 2000 | Journal of Engineering Mechanics2000，，8： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员