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Energy mechanism of bolt supporting effect to fissured rock under static and dynamic loads in deep coal mines

International Journal of Mining Science and Technology 2024年第3期34卷 371-384页

作者： Deyuan Fan Xuesheng Liu yunliang tan Xuebin Li Shenglong Yang College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China National Energy Group Ningxia Coal Industry Co. Ltd.Yinchuan 753001China

The stability control of fissured rock is difficult,especially under static and dynamic loads in deep coal *** this paper,the dynamic mechanical properties,strain rate evolution and energy dissipation of fissured and anchored rocks were respectively obtained by SHPB *** was found that bolt can provide supporting efficiency-improving effect for fissured rock against dynamic disturbance,and this effect increased quadratically with decrease in anchoring ***,the energy dissipation mechanism of anchored rock was obtained by slipping ***,bolt energy-absorbing mechanism by instantaneous tensile-shear deformation was expressed based on material mechanics,which was the larger the anchoring angle,the smaller the energy absorption,and the less the contribution to supporting efficiency *** this basis,the functional relationship between energy dissipation of anchored rock and energy absorption of bolt was *** the coal-gangue separation system of Longgu coal mine as an example,the optimal anchoring angle can be determined as 57.5°–67.5°.Field monitoring showed fissured rock with the optimal anchoring angle,can not only effectively control the deformation,but also fully exert the energy-absorbing and efficiency-improving effect of bolt *** study provides guidance to the stability control and supporting design for deep engineering under the same or similar conditions.

关键词： Static and dynamic loads Anchored rock Energy absorption Anchoring angle Engineering verification

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Theoretical framework for stress relief-support reinforcement cooperativecontrol of rock bursts in deep coal mining

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Geohazard Mechanics 2024年第1期2卷 49-57页

作者： Tongbin Zhao Weiyao Guo Dongxiao Zhang yunliang tan Yanchun Yin Yan tan Yujing Jiang Jinpeng Yao College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao266590China State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao266590China Graduate School of Engineering Nagasaki UniversityNagasaki852-8521Japan

With the increasing depth of coal mining each year,rock burst has emerged as one of the most severe dynamic disasters in deep *** research status of rock burst prevention and control theory is *** on deep coal mining,the major issues encountered in researching the prevention theory of rock bursts are ***,the scientiﬁc connotation theory of stress relief-support reinforcement cooperative prevention and control of rock bursts in deep coal mines is ***,the mechanisms underlying the major research directions of the theory of stress relief-support reinforcement coordinated prevention and control and present a preliminarily theoretical framework for stress relief-support reinforcement coordinated prevention and control are *** tackle the key scientiﬁc problems in the coordinated prevention and control of rock bursts on relief and support in deep mine,the in-depth research based on the synergetic theory is *** involved exploring the principles of near-ﬁeld coal mass stress relief,near-ﬁeld roof andﬂoor stress relief,and anchor ***,the stress-energy evolution processes of the roadway near-ﬁeld surrounding rock structure under various stress relief and anchor support modes be ***,a mechanical model for the optimized matching of stress relief surrounding rock and anchor support is established,with the control of the rock burst energy source at its ***,the principle of collaborative prevention and control of deep mining rock burst stress relief and support from the perspectives of structural synergy,strength synergy,and stiffness synergy is *** insight is expected to provide theoretical support for the research and development of designs and techniques for deep mining rock burst prevention and control.

关键词： Deep mining Rock burst Stress relief Support Collaborative prevention and control

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不同倾角断层滑移失稳机制试验研究

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采矿与安全工程学报 2024年第4期41卷 749-758页

作者：谭彦郭伟耀王浩谭云亮赵同彬张东晓方恒宇山东科技大学能源与矿业工程学院山东青岛266590 长崎大学工学研究科日本长崎852-8521 山东能源集团有限公司山东济南250014

提出了断层摩擦滑移室内试验方法,研究了不同倾角断层摩擦滑移过程中应力、应变、声发射、温度场等演化规律,探讨了断层倾角影响下断层滑移失稳的能量机制。研究结果表明:随着断层倾角增加,断层面阻滑特性及摩擦破坏程度均减小;在断层... 详细信息

提出了断层摩擦滑移室内试验方法,研究了不同倾角断层摩擦滑移过程中应力、应变、声发射、温度场等演化规律,探讨了断层倾角影响下断层滑移失稳的能量机制。研究结果表明:随着断层倾角增加,断层面阻滑特性及摩擦破坏程度均减小;在断层滑移失稳之前,断层面不同位置应变均产生分化现象,其中垂直断层面应变产生分化现象早于平行断层面,但随着断层倾角增大,断层面不同位置应变在滑移失稳之前协同性增强。声发射信号强度随着断层倾角增大而减小,尤其在滑移失稳阶段声发射b值随着断层倾角增大而显著增加,大尺度微破裂减少;随着断层倾角增大,断层滑移过程中释放的热量及滑移失稳阶段温度增幅均显著减小。大倾角断层不利于积聚能量,但易发生滑移且多次释放能量,易诱发断层⁃煤体结构失稳型冲击地压,而小倾角断层利于积聚能量,单次失稳滑移释放能量更多,更易诱发断层强动载扰动型冲击地压。

关键词：冲击地压断层滑移声发射(AE) 温度场

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深部沿空巷道锚固围岩破坏失稳能量驱动机理

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煤炭学报 2024年第4期49卷 1819-1833页

作者：刘学生王新谭云亮李学斌杨生龙裴洪喜山东科技大学能源与矿业工程学院山东青岛266590 兖矿能源集团股份有限公司鲍店煤矿山东济宁273513 山东科技大学矿山灾害预防控制重点实验室山东青岛266590 国家能源集团宁夏煤业有限公司宁夏银川750011

深部沿空巷道受侧向顶板断裂所产生的动载影响,锚固围岩易产生大变形,甚至破坏失稳。以山东省孙村煤矿31120工作面上平巷为工程背景,首先采用YTJ20型岩层探测记录仪获得了锚固顶板裂隙发育规律及以脆性张裂破坏为主的破坏方式。然后,通... 详细信息

深部沿空巷道受侧向顶板断裂所产生的动载影响,锚固围岩易产生大变形,甚至破坏失稳。以山东省孙村煤矿31120工作面上平巷为工程背景,首先采用YTJ20型岩层探测记录仪获得了锚固顶板裂隙发育规律及以脆性张裂破坏为主的破坏方式。然后,通过相似材料模拟试验方法获得了深部沿空巷道侧向顶板前期、过渡期和后期3个运动阶段典型特征,并分析了不同阶段锚固围岩破裂演化及能量释放规律;其中过渡期运动阶段锚固围岩内部应力、变形量急剧增大,裂隙发育明显,能量释放显著,对沿空巷道锚固围岩稳定性影响最大。最后,构建了侧向顶板断裂运动下沿空巷道结构力学模型,给出了锚固围岩输入能量与可抵抗能量定量计算方法,揭示了侧向顶板断裂诱发锚固围岩破坏失稳能量驱动机理,并定义了失稳能量判据,即当作用在沿空巷道锚固围岩上的能量大于锚固围岩可抵抗能量时,将发生破坏失稳。进一步地,提出了锚固围岩失稳风险等级划分方法和相应地控制技术,计算结果表明,31120工作面沿空巷道锚固围岩失稳风险等级为中风险。采取加强支护措施后,沿空巷道顶底板及两帮移近量分别减小35.47%和35.71%,锚索受力减小23.43%,变形速度明显降低,锚固围岩能量积聚程度减小。

关键词：沿空巷道侧向顶板锚固围岩能量驱动机理

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冲击地压主控因素及孕灾机制

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煤炭学报 2024年第1期49卷 367-379页

作者：谭云亮张修峰肖自义范德源尹延春陈洋刘学生山东科技大学能源与矿业工程学院山东青岛266590 山东能源集团有限公司山东济南250101 国家矿山安全监察局山东局山东济南250031

随着我国煤矿逐步向深部开采转移,冲击地压灾害日趋严重。在冲击地压从机理认知走向防冲工程进程中,首要的任务是厘清冲击地压孕灾主控因素,并进行风险程度判识。在上百个冲击地压矿井致灾评价分析基础上,提出了导致冲击地压发生的4类... 详细信息

随着我国煤矿逐步向深部开采转移,冲击地压灾害日趋严重。在冲击地压从机理认知走向防冲工程进程中,首要的任务是厘清冲击地压孕灾主控因素,并进行风险程度判识。在上百个冲击地压矿井致灾评价分析基础上,提出了导致冲击地压发生的4类客观主控因素:煤岩冲击倾向性、开采深度、坚硬顶板、地质构造,以及3类人为主控因素:煤柱、采空区及采掘卸荷,并对各主控因素对冲击地压孕灾的力学机制进行了分析讨论。在客观主控因素方面,煤岩冲击倾向性是煤岩积聚变形能进而诱发冲击破坏的自身属性;开采深度与巷道围岩内积聚的变形能呈正相关关系,是冲击地压发生的必要条件;坚硬顶板大尺度周期断裂形成的冲击动载及动能是诱发冲击地压的“导火索”;地质构造对冲击地压的影响显著,对于断层构造而言,断层两盘将在开采扰动造成的突发卸荷影响下产生相对“回弹”;煤层变薄区等效弹性模量变大,超前支承压力呈“双峰值”分布,使得冲击影响范围扩大。在人为主控因素方面,煤柱作为高应力集中区,其尺寸、倾角及相对位置等将直接影响冲击地压发生的概率和强度;采空区会诱发超前支承压力集中区内围岩积聚弹性能的突然释放,尤其是在采高较大、顶板垮落不充分的情况下;采掘卸荷会导致应力集中区快速“迁移”,引发煤体内弹性应变能的大量释放,是造成冲击地压的重要外因条件。在此基础上,对山东新汶、山东鲁西、内蒙古鄂尔多斯、陕西彬长、新疆和甘肃等矿区冲击地压孕灾主控因素差异性,进行了对比分析,强调按层次对矿井、采区和工作面进行冲击地压主控因素及其影响程度判识重要性,构建了从降能、释能、阻能到抗能的冲击地压治理工程路径。

关键词：冲击地压主控因素孕灾风险判识递进式防治

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Mechanical mechanism of overlying strata breaking and development of fractured zone during close-distance coal seam group mining

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International Journal of Mining Science and Technology 2020年第2期30卷 207-215页

作者： Jianguo Ning Jun Wang yunliang tan Qiang Xu College of Mining and Safety Engineering State Key Laboratory Breeding Base for Mining Disaster Prevention and ControlShandong University of Science and TechnologyQingdao 266590China

This study mainly investigates the mechanical mechanism of overlying strata breaking and the development of fractured zones during close-distance coal seam group mining in the Gaojialiang coal ***,a mechanical model for the second"activation"of broken overlying strata is established,and the related mechanical"activation"conditions are obtained.A recursive formula for calculating the separation distance of overlying strata is ***,a height determining method for predicting the height of fractured zones during close-distance coal seam group mining is proposed based on two values,namely,the separation distance and ultimate subsidence value of overlying *** method is applied to calculate the fractured zone heights in nos.20107 and 20307 mining *** calculated results are almost equal to the field observation ***,a modified formula for calculating the height of a waterflowing fractured zone is proposed.A comparison of the calculated and observed results shows that the errors are *** height determining method and modified formula not only build a theoretical foundation for water conservation mining at the Gaojialiang coal mine,but also provide a reference for estimating the height of water-flowing fractured zones in other coal mines with similar conditions.

关键词： Coal seam group Activation mechanism Separation Water-flowing fractured zone Modified formula

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Instability energy mechanism of super-large section crossing chambers in deep coal mines

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International Journal of Mining Science and Technology 2022年第5期32卷 1075-1086页

作者： Deyuan Fan Xuesheng Liu yunliang tan Xuebin Li Purev Lkhamsuren College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China School of Geology and Mining Mongolian University of Science and TechnologyUlaanbaatar 120646Mongolia

The stress concentration and failure at chamber intersections in coal mine are intense,especially in deepburied,super-large section *** this paper,the plastic radius of super-large section chamber under unequal pressure was corrected on the basis of the size ***,stress and failure evolution of intersections under different crossing angles and equivalent angular bisectors were ***,2 trajectory curves of failure and stress were analytically expressed,which divided the intersection into 5 influencing zones in the light of stress superposition *** determining instability trigger point and instability path,instability energy criterion of intersection can be obtained as K>1,which means that the external energy is greater than the sum of energy consumed by surrounding rock instability and supporting structure *** coal-gangue separation system of Longgu Coal Mine as example,it was found that there was instability risk under original *** long-term stability,an optimization design method was proposed by considering safety factor,and optimal support scheme was *** monitoring showed intersections deformations were relatively small with the maximum of 125 mm,which verified the rationality of theoretical *** study provides guidance for the stability control of the intersections under the same or similar conditions.

关键词： Super-large section Intersection Instability energy mechanism Optimization design Field monitoring

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Deformation tests and failure process analysis of an anchorage structure

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International Journal of Mining Science and Technology 2015年第2期25卷 237-242页

作者： Zhao Tongbin Yin Yanchun tan yunliang Song Yimin State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Faculty of Resources and Safety Engineering China University of Mining and Technology College of Architectural Engineering North China University of Technology

In order to study the failure process of an anchorage structure and the evolution law of the body＇s defor- mation field, anchor push-out tests were carried out based on digital speckle correlation methods （DSCM）. The stress distribution of the anchorage interface was investigated using the particle flow numerical simulation method. The results indicate that there are three stages in the deformation and fail- ure process of an anchorage structure： elastic bonding stage, a de-bonding stage and a failure stage. The stress distribution in the interface controls the stability of the structure. In the elastic bonding stage, the shear stress peak point of the interface is close to the loading end, and the displacement field gradually develops into a ＂V＂ shape, in the de-bonding stage, there is a shear stress plateau in the center of the anchorage section, and shear strain localization begins to form in the deformation field. In the failure stage, the bonding of the interface fails rapidly and the shear stress peak point moves to the anchorage free end. The anchorage structure moves integrally along the macro-cracl~ The de-bonding stage is a research focus in the deformation and failure process of an anchorage structure, and plays an important guiding role in roadway support design and prediction of the stability of the surrounding rock.

关键词： Anchorage structure Digital speckle correlation methods Deformation field Interface stress Failure process

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Pitting corrosion behavior of Cu-P-RE weathering steels

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Journal of Rare Earths 2023年第2期41卷 321-330页

作者： Lijie Yue Yeshu Meng Jinsheng Han Kun Xie Yipin Sun yunliang tan School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Civil Engineering and Architecture Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China

The weathering steels are prone to pitting corrosion in an environment containing chloride *** pitting behavior of Cu-P-RE weathering steels and its effect on the corrosion resistance of steels were investigated by multifarious analytical techniques,such as field emission-scanning electron microscopy(FE-SEM),electron probe microanalysis(EPMA),scanning Kelvin probe force microscopy(SKPFM),electrochemical workstation and a series of immersion *** results show that the original stripshaped MnS inclusions and Al_(2)O_(3)inclusions with sharp angles are modified into the fine spherical rare earth(RE)inclusions with small average size,which are mainly RE oxysulfides after adding appropriate amount of mischmetal(48.9 wt%Ce-42 wt%La-5 wt%Nd-Fe)into the Cu-P weathering *** the environment containing Cl^(-),the pitting corrosion in RE weathering steel is induced by the preferential dissolution of RE inclusions in that the RE inclusions have a more negative potential than steel matrix at the initial corrosion *** the increase of corrosion time,the driving force of pitting expansion is weakened as a re sult of the continuous dissolution of RE inclusions,which makes the pitting tend to propagate horizontally around the RE *** the RE inclusions completely dissolve,the open corrosion pits with shallow depth are formed in *** dispersed pitting pits with small size and shallow depth induced by RE inclusions are conducive to the formation of uniform and dense corrosion products layer on the steel surface,which reveals that the addition of RE can improve the corrosion resistance of weathering steels.

关键词： Inclusion Pitting corrosion Weathering steel Rare earths Corrosion resistance

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International Journal of Mining Science and Technology 2021年第3期31卷 495-505页

作者： Xuesheng Liu Shilin Song yunliang tan Deyuan Fan Jianguo Ning Xuebin Li Yanchun Yin College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China

Large and super-large section chamber groups in coal mines are frequently affected by dynamic loads resulting from production activities such as roadway driving and *** stability of the surrounding rock is poor,and it is difficult to *** this paper,a similar simulation test was used to study the deformation and evolution laws of the surrounding rock of a triangle-shaped chamber group under different dynamic *** results showed that under dynamic loading,the vertical stress of the surrounding rock of the chamber group increased in an oscillatory *** maximum stress concentration coefficient reached *** damage degree of the roof was greater than that of the two *** deformation of the roof was approximately 1.2 times that of the two *** the chamber closer to the power source,the stress oscillation amplitude of the surrounding rock was larger,and the failure was more *** force of the anchorage structure showed a phased increasing characteristic;additionally,the force of the anchorage structure on the adjacent side of the chambers was greater than that on the other *** study reveals the deformation and failure evolution laws of the surrounding rock of large section chamber groups under dynamic loading.

关键词： Dynamic disturbance Large section chamber group Deformation and failure Similar simulation test

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