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Mechanism and control technology of strong ground pressure behaviour induced by high-position hard roofs in extra-thick coal seam mining

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International Journal of Mining Science and Technology 2022年第3期32卷 499-511页

作者： Chao Pan Binwei Xia Yujun Zuo Bin Yu Changnan Ou Mining College Guizhou UniversityGuiyang 550025China National&Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam Chongqing UniversityChongqing 400044China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China

This work aimed at revealing the mechanism of strong ground pressure behaviour(SGPB)induced by high-position hard roof(HHR).Based on the supporting structures model of HHR,a modified voussoir beam mechanical model for HHR was established by considering the gangue support coefficient,through which the modified expressions of limit breaking span and breaking energy of HHR were deduced.Combined with the relationship between the dynamic-static loading stress of supporting body(hydraulic support and coal wall)and its comprehensive supporting strength,the criteria of ground pressure behaviour(GPB)induced by HHR were discussed.The types of Ⅰ_(1),Ⅰ_(2),Ⅱ_(1),andⅡ_(2) of GPB were interpreted.Results showed that types Ⅰ_(1) and Ⅰ_(2) were the main forms of SGPB in extra-thick coal seam mining.The main manifestation of SGPB was static stress,which was mainly derived from the instability of HHR rather than fracture.Accordingly,an innovative control technology was proposed,which can weaken static load by vertical-well separated fracturing HHR.The research results have been successfully applied to the 8101 working face in Tashan coal mine,Shanxi Province,China.The results of a digital borehole camera observation and stress monitoring proved the rationality of the GPB criteria.The control technology was successful,paving the way for new possibilities to HHR control for safety mining.

关键词： Extra thick coal seam High-position hard roof Strong ground pressure behaviour Supporting structures Criteria of ground pressure behaviour Controlling effects

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Acoustic emission-based numerical simulation of tectonic stress field for tectoclase prediction in shale reservoirs of the northern Guizhou area, China

Energy Geoscience

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Energy Geoscience 2022年第4期3卷 436-443页

作者： Zhonghu Wu Motian Tang Yujun Zuo Yili Lou Wentao Wang Hao Liu Wenjibin Sun College of Civil Engineering Guizhou UniversityGuiyangGuizhou550025China School of Qilu Transportation Shandong UniversityJinanShandong250002China Geotechnical and Structural Engineering Research Center Shandong UniversityJinanShandong250061China Mining College Guizhou UniversityGuiyangGuizhou550025China

Natural fractures,like tectoclases,are essential in the formation of shale gas reservoirs and have been the focus of study for shale gas development.Tectoclases provide most storage space for gas and are largely controlled by the paleo-tectonic stress field in shale reservoirs of the Niutitang Formation,northern Guizhou area,China.An accurate prediction of the development and distribution of tectoclases in the reservoirs is of great significance to exploring and developing shale gas sweet spots in the area.Based on geological structure evolution and fracture characterization,this study is focused on factors that control the fracture development in the Niutitang Formation shale reservoirs in northern Guizhou through characterization and modeling of geomechanisms and tectonic movements.A geomechanical model is formulated for the shale reservoirs against the geological background of the area.On this basis,the fractures are predicted by using the acoustic emission data.Numerical simulation results show that the development and distribution of tectoclase is controlled by fault zones,some of which have no obvious turning points with tectoclase in the middle sections being more developed and fragmented than those at the two ends.Some of these have obvious S-shaped turning points where tectoclases are the most developed and fragmented.

关键词： Shale reservoir Tectonic stress field Numerical simulation Tectoclase Acoustic emission

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Enrichment characteristics of normal-pressure marine shale gas in the complex tectonic zone: a case study of the Lower Cambrian Niutitang Formation in northern Guizhou

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Journal of Earth Science 2024年

作者： Wenjibin Sun Zhonghu Wu Yujun Zuo Chao Pan Hao Liu Baofeng Lan Jianyun Lin Bin Chen Qinggang Chen Guizhou Energy Industry Research Institute Co. Ltd Mining College Guizhou University College of Resource and Environmental Engineering Guizhou University College of Civil Engineering Guizhou University

The Lower Cambrian Niutitang Formation is a crucial stratum for the exploration of normal-pressure marine shale gas in southern China， with great development potential. To research the normal-pressure shale gas accumulation of the Niutitang Formation in the complex tectonic zone， the shale cores in northern Guizhou were subjected to X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) observation， and tests were conducted to determine total organic content (TOC)， bitumen reflectance， and nitrogen isotopes. The results indicate that the equivalent vitrinite reflectance of cores varies from 2.30% to 3.73%， and the TOC content of cores varies from 3.8% to 7.8%. The total gas content of three wells in northern Guizhou is 0.5 m3/t， 0.3 m3/t， and 1.4 m3/t， respectively. The TOC content of the shale in the syncline structure is higher than that of the shale in the anticline structure. Nitrogen in shale gas originates primarily from the thermal ammoniation of organic matter， the atmosphere， and the deep crust. Shale gas preservation is favourable in regions with a large range of lifting， and small lifting differences. The syncline is broad and gentle with few faults have better gas accumulation conditions. The Niutitang Formation in the residual syncline of the study area has better gas content than that of other structures. Exploration of shale gas accumulation sweet spots in northern Guizhou should focus on the broad-gentle synclines with minimal changes in stratigraphic lifting， few faults， and no hydrothermal activity at the edges of paleo-uplifts.

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Numerical Tests on Zonal Disintegration within Rockmass Around Deep Tunnel under Dynamic Disturbance

Numerical Tests on Zonal Disintegration within Rockmass Arou...

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2012年计算机应用与系统建模国际会议

作者： Chunchun Chen Yujun Zuo Dekang Zhu Research Center for Numerical Test of Material Failure Dalian University

Numerical tests on three-dimensional rock samples containing hole were carried out with finite element software ANSYS to investigate the mechanism of zonal disintegration within surrounding rockmass around deep circular tunnel under dynamic disturbance. Numerical tests presented the distribution of stress and deformation and visualized zonal disintegration phenomenon of rockmass around deep semiarched tunnel under dynamic loads. The simulation results indicate that zonal disintegration phenomenon may occur, when superposition value of high ground stress and dynamic disturbance satisfies a certain condition.

关键词： Rockmass around deep tunnel Zonal disintegration Numerical test Dynamic disturbance

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A carbon-oxygen-bridged ladder-type building block for efficient donor and acceptor materials used in organic solar cells

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Science Bulletin 2017年第19期62卷 1331-1336页

作者： zuo Xiao Fan Liu Xinjian Geng Jianqi Zhang Shizhe Wang yujun Xie Zhen Li Huai Yang Yongbo Yuan Liming Ding Center for Excellence in Nanoscience (CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS)National Center for Nanoscience and Technology Department of Chemistry Wuhan University College of Engineering Peking University School of Physics & Electronics Central South University

A carbon-oxygen-bridged ladder-type donor unit(CO5) was invented and prepared via an ‘‘intramolecular demethanolization cyclization" approach. Its single crystal structure indicates enhanced planarity compared with the carbon-bridged analogue indacenodithiophene(IDT). Owing to the stronger electron-donating capability of CO5 than IDT, CO5-based donor and acceptor materials show narrower bandgaps. A donor-acceptor(D-A) copolymer donor(PCO5TPD) and an A-D-A nonfullerene acceptor(CO5IC) demonstrated higher performance than IDT-based counterparts, PIDTTPD and IDTIC, respectively. The better performance of CO5-based materials results from their stronger light-harvesting capability and higher charge-carrier mobilities.

关键词：受体材料有机太阳能电池氧桥结构块梯形碳施主载流子迁移率

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南方亚热带季风区将乐县森林植被动态变化及其对气候变化的响应

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地球信息科学学报 2019年第6期21卷 958-968页

作者：左冰洁孙玉军北京林业大学森林资源和环境管理国家林业局重点开放性实验室北京林业大学林学院

在全球气候变化背景下,植被动态变化以及植被对气候变化的响应方式已经成为生态学和地理学领域的热点。本文对比分析了南方亚热带季风区将乐县不同类型森林植被对不同时间尺度的干旱响应的差别。基于2000-2017年MODIS-EVI数据及气象站... 详细信息

在全球气候变化背景下,植被动态变化以及植被对气候变化的响应方式已经成为生态学和地理学领域的热点。本文对比分析了南方亚热带季风区将乐县不同类型森林植被对不同时间尺度的干旱响应的差别。基于2000-2017年MODIS-EVI数据及气象站点数据,用最大值合成法、趋势分析法以及相关分析法,分析了森林植被及气象因子的动态变化特征,并对比不同森林植被对气候变化响应的差别。研究表明:①2000-2017年,研究区植被覆盖度、EVI和降水均显著增加,区域内湿度增加,森林长势渐趋良好;②EVI在生长季初期和末期与同期的降水、温度均显著正相关(P<0.1),初期森林受降水因子的影响更大,末期受温度因子的影响大;③1-3月和周年的气候变化对森林的生长至关重要,长时间尺度的湿度增加对森林生长具有显著的促进作用,SPEI的时间尺度越长与EVI的相关性也越大;④针阔混交林与同期温度、降水的相关系数最高,并且与不同时间尺度的SPEI相关性均比较高,属于气候敏感型林型,在生产经营中要谨慎预防气候变化对该林型带来的伤害;⑤森林覆盖度变化与降水和SPEI24的相关性极显著,长时间尺度的降水变化是影响森林植被覆盖率变化的重要因素之一。

关键词：森林植被类型 MODIS-EVI 气象因素变化趋势相关性分析南方亚热带季风区将乐县

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大断面六角形进路围岩应力解析与数值验证

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采矿与安全工程学报 2022年第5期39卷 951-960页

作者：吴浩马丹左宇军赵国彦中国矿业大学矿业工程学院江苏徐州221116 云南磷化集团有限公司云南昆明650600 贵州大学矿业学院贵州贵阳550025 中南大学资源与安全工程学院湖南长沙410083

为研究龙首矿大断面六角形进路采场围岩的应力分布特征,通过保角变换方法将六角形进路围岩映射到像平面单位圆外域,采用改进的复变函数理论对进路围岩应力进行解析,并与数值结果进行对比。研究结果表明,提出的多面体收缩逼近算法能够准... 详细信息

为研究龙首矿大断面六角形进路采场围岩的应力分布特征,通过保角变换方法将六角形进路围岩映射到像平面单位圆外域,采用改进的复变函数理论对进路围岩应力进行解析,并与数值结果进行对比。研究结果表明,提出的多面体收缩逼近算法能够准确求解复杂形状孔洞的映射函数,大断面六角形进路映射函数项数取6时具有较高的精度。当侧压系数λ<0.39时,顶底板出现拉应力集中,两侧壁产生压应力集中。随着λ的增大,顶底板拉应力逐渐减小并变为压应力,两侧壁应力情况则相反。进路围岩中切向应力随着距进路边界距离的增大逐渐减小,随着侧压系数的增大而增大;当距进路边界的距离渐增时,进路顶底板中的径向应力值逐渐接近施加的竖向应力,进路两帮中的径向应力值逐渐接近施加的水平应力。另外,进路周边22个监测点应力的数值模拟结果充分证实了解析解的可靠性,大断面六角形进路同比小断面进路在深部开采中具有较高的稳定性。研究结果可为采场结构参数优化及进路支护设计提供参考。

关键词：大断面六角形进路应力解析解保角变换复变函数

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戈塘金矿房柱法开采围岩稳定性分析

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黄金科学技术 2020年第2期28卷 271-277页

作者：陈洲左宇军贵州理工学院矿业工程学院贵州贵阳550003 贵州大学矿业学院贵州贵阳550025

戈塘金矿矿体厚度变化较大,地质条件复杂。为科学设计井下采场参数,分析采空区顶板的破坏机理及矿柱的承载机理,指导矿山安全生产,以戈塘金矿为研究对象,设计了采场参数,分析了采场围岩稳定性。通过理论计算,采用房柱法开采时,推荐矿柱... 详细信息

戈塘金矿矿体厚度变化较大,地质条件复杂。为科学设计井下采场参数,分析采空区顶板的破坏机理及矿柱的承载机理,指导矿山安全生产,以戈塘金矿为研究对象,设计了采场参数,分析了采场围岩稳定性。通过理论计算,采用房柱法开采时,推荐矿柱尺寸为3 m×3 m,矿房跨度不超过10 m;利用有限元软件Phase2对留设不同宽高比的矿柱时采场围岩的稳定性进行了数值模拟分析。结果显示:矿柱内部出现应力集中,采空区顶底板、岩帮为应力降低区域;随着矿柱宽高比的增大,采空区边界附近的应力水平和位移降低,矿柱内应力集中得到缓解,变形量降低。综合分析认为,矿柱宽高比对采场围岩稳定性有一定影响,保持矿柱宽高比约为0.500,可以较好地维持采场稳定。

关键词：房柱法围岩稳定性承载机理矿柱矿房跨度数值分析戈塘金矿

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福建省几种气象干旱指数的对比分析

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气象 2019年第5期45卷 685-694页

作者：左冰洁孙玉军北京林业大学森林资源和环境管理国家林业局重点开放性实验室

选用合理的干旱指数对干旱进行监测一直是干旱研究的难点之一,对不同指数的适用性进行研究可以为干旱监测提供一定的参考依据。基于1960-2017年福建省气象站的逐日气象观测数据,采用频率累积法对五种干旱指数的阈值进行修正,利用层次分... 详细信息

选用合理的干旱指数对干旱进行监测一直是干旱研究的难点之一,对不同指数的适用性进行研究可以为干旱监测提供一定的参考依据。基于1960-2017年福建省气象站的逐日气象观测数据,采用频率累积法对五种干旱指数的阈值进行修正,利用层次分析法计算不同等级干旱事件的权重,结合120个典型历史干旱事件,对降水距平百分率(Pa)、标准化降水指数(SPI)、标准化降水蒸散指数(SPEI)、相对湿润指数(MI)、改进综合气象干旱指数(CInew)在福建省的适用性进行了分析。结果表明:CInew适用于春秋冬季和年际的干旱监测,MI适用于夏秋冬季的干旱监测,这两种指数对重旱和特旱事件的监测效果比较好,SPI和SPEI对中旱和轻旱事件的监测效果比较好。五种指数均能比较好地描述干旱的发展过程,CInew的监测结果更贴合实际,并且较符合干旱发生的机制。因此CInew在福建省的干旱监测中比较适用,MI次之。

关键词：干旱指数适用性对比分析福建省

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Mechanical properties of rock under coupled static-dynamic loads

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Journal of Rock Mechanics and Geotechnical Engineering 2009年第1期1卷 41-47页

作者： Xibing Li Zilong Zhou Fujun Zhao Yujun Zuo Chunde Ma Zhouyuan Ye Liang Hong School of Resources and Safety Engineering Central South University Changsha 410083 China Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines Central South University Changsha 410083 China

Rock drilling machine,INSTRON testing system,and SHPB device are updated to investigate the characteristics of rocks at great depth,with high loads from overburden,tectonic stresses and dynamic impacts due to blasting and boring.It is verified that these testing systems can be used to study the mechanical properties of rock material under coupled static and dynamic loading condition and give useful guidance for the deep mining and underground cavern excavation.Various tests to determine the rock strength,fragmentation behavior,and energy absorption were conducted using the updated testing systems.It is shown that under coupled static-dynamic loads,if the axial prestress is lower than its elastic limit,the rock strength is higher than the individual static or dynamic strength.At the same axial prestress,rock strength under coupled loads rises with the increasing strain rates.Under coupled static and dynamic loads,rock is observed to fail with tensile mode.While shear failure may exist if axial prestress is high enough.In addition,it is shown that the percentage of small particles increases with the increasing axial prestress and impact load based on the analysis of the particle-size distribution of fragments.It is also suggested that the energy absorption ratio of a specimen varies with coupled loads,and the maximum energy absorption ratio for a rock can be obtained with an appropriate combination of static and dynamic loads.

关键词： rock dynamic testing system coupled static-dynamic loads strength fragmentation energy absorption

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