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Arch structure effect of the coal gangue flow of the fully mechanized caving in special thick coal seam and its impact on the loss of top coal

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International Journal of Mining Science and Technology 2016年第4期26卷 593-599页

作者： Zhang Ningbo liu changyou State Key Laboratory of Coal Resources and Mine Safety China University of Mining and Technology School of Mines Key Laboratory of Deep Coal Resource MiningMinistry of Education of ChinaChina University of Mining and Technology

Based on the characteristics of the top coal thickness of the fully mechanized caving in special thick coal seam,the long distance of coal gangue caving,as well as the different sizes of the coal gangue broken fragment dimension and spatial variation of drop flow,this paper uses laboratory dispersion simulation experiment and theoretical analysis to study the arch structure effect and its influence rule on the top coal loss in the process of coal gangue *** shows that in the process of coal gangue flow,arch structure can be formed in three types:the lower arch structure,middle arch structure,and upper arch ***,the arch structure has the characteristics of dynamic random arch,the formation probability of dynamic random arch with different layers is not the same,dynamic random arch caused the reduction of the top coal fluency;analyzing the dynamic random arch formation mechanism,influencing factors,and the conditions of instability;the formation probability of the lower arch structure is the highest,the whole coal arch and the coal gangue arch structure has the greatest impact on top coal ***,to prevent or reduce the formation of lower whole coal arch structure,the lower coal gangue arch structure and the middle whole coal arch structure is the key to reduce the top coal *** research conclusion provides theoretical basis for the further improvement of the top coal recovery rate of the fully mechanized caving in extra thick coal seam.

关键词： Extra thick coal seam Coalgangue flow Top coalloss Dynamic random arch effect

山东省科技型中小企业科技人才队伍建设问题分析

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全国流通经济 2024年第10期 53-56页

作者：李磊刘长有山东第一医科大学(山东省医学科学院) 山东泰安271016 泰山学院山东泰安271000

在推动科技型中小企业创新发展过程中,科技人才作为科技型中小企业的主体具有重要的作用。本文通过分析山东省科技型中小企业科技人才队伍建设现状,探讨该类企业科技人才队伍建设中存在的问题,提出山东省科技型中小企业科技人才队伍建... 详细信息

在推动科技型中小企业创新发展过程中,科技人才作为科技型中小企业的主体具有重要的作用。本文通过分析山东省科技型中小企业科技人才队伍建设现状,探讨该类企业科技人才队伍建设中存在的问题,提出山东省科技型中小企业科技人才队伍建设的对策与建议。本研究对于优化科技人才结构、健全创新激励和保障机制、激发科技人才创新创造活力、提高科技型中小企业创新能力和核心竞争力、促进山东省人才兴鲁战略深入实施、推动山东省经济高质量发展和新时代社会主义现代化强省建设具有重要意义。

关键词：科技型中小企业人才队伍评价指标体系

Rock-breaking mechanism and experimental analysis of confined blasting of borehole surrounding rock

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International Journal of Mining Science and Technology 2017年第5期27卷 795-801页

作者： liu changyou Yang Jingxuan Yu Bin School of Mines China University of Mining&TechnologyXuzhou 221116China Datong Coal Mine Group Company Datong 037003China

The rock-breaking mechanism and effect of confined blasting were analysed by blasting and impact dynamic mechanics, fluid dynamic mechanics, fracture mechanics as well as blasting experiment. The results showed that the fracturing of surrounding rock in confined blasting condition is the result of coaction of rock pre-cracking by shock wave and stress wave and the continuing expanding crackenhancement of confined medium, and the model of crack development of borehole surrounding rock in confined blasting condition was established. This study acquired the damage range of surrounding rock under the action of shock wave and stress wave, as well as the crack development characteristics of surrounding rock after the wedge-in confined medium into the crack space. Deep-hole confined blasting experiment on large rock showed that the high-efficient utilisation of in-hole explosive was achieved and the safety of rock blasting operation was ensured. Safe static rock-breaking under the action of high-efficient explosive blasting was achieved as well as the unification of super dynamic load of explosive blasting and static rock-breaking of water medium.

关键词： Shock wave Confined medium Water-wedge action Crack development Confined blasting

斜沟煤矿厚煤层综采工作面顶板断裂失稳规律及智能预测设计

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煤炭科技 2024年第3期45卷 75-83页

作者：杨丛鑫刘长友中国矿业大学矿业工程学院江苏徐州221116

随着煤矿智能化综采工作面的快速发展,顶板破断失稳规律及来压的智能预测成为迫切需要解决的问题,该问题的解决对于进一步完善综采工作面智能化控制体系、防范采场顶板灾害的发生具有重要意义。以斜沟煤矿厚煤层综采工作面为工程技术背... 详细信息

随着煤矿智能化综采工作面的快速发展,顶板破断失稳规律及来压的智能预测成为迫切需要解决的问题,该问题的解决对于进一步完善综采工作面智能化控制体系、防范采场顶板灾害的发生具有重要意义。以斜沟煤矿厚煤层综采工作面为工程技术背景,结合该工作面煤岩地质特征及生产技术条件,利用数值模拟方法,研究了工作面顶板破断规律及应力演化特征,分析了顶板断裂失稳引起的矿压显现特征及其对煤岩稳定性和支架稳定性的影响,确定了9种特征参数作为反映顶板断裂失稳的特征信息,并作为智能矿压监测预警模型的基础参量。由此设计了工作面矿压多参量信息智能感知系统,为煤矿综采工作面智能矿压监测预警提供了一种新思路。

关键词：顶板破断规律智能矿压矿压特征信息智能来压预警深度学习

向斜构造区特厚煤层开采覆岩结构稳定性及突水压架机理

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煤炭学报 2024年第9期49卷 3745-3758页

作者：刘怀东刘长友杨培举王晨鸿杨敬轩中国矿业大学矿业工程学院江苏徐州221116 紫金矿业集团紫金(长沙)工程技术有限公司湖南长沙410000

针对陕西省永陇矿区褶曲构造带突水压架事故频发问题,以陕西省郭家河煤矿为工程背景,采用现场调研、物理实验与理论分析的方法,确定了导致工作面突水压架的主要含水层,得出了向斜构造区煤层开采覆岩破断失稳特征,建立了考虑承压水作用... 详细信息

针对陕西省永陇矿区褶曲构造带突水压架事故频发问题,以陕西省郭家河煤矿为工程背景,采用现场调研、物理实验与理论分析的方法,确定了导致工作面突水压架的主要含水层,得出了向斜构造区煤层开采覆岩破断失稳特征,建立了考虑承压水作用的覆岩结构力学模型,推导了工作面突水压架的临界水压力,揭示了向斜构造区突水压架机理。研究表明:①1303、1304、1308等已开采工作面在向斜轴部区域均发生过突水压架事故,宜君组岩层是导致工作面突水事故的主要含水层,煤层之上102.5 m处厚度为28.53 m的中粒砂岩为隔水关键层。隔水关键层断裂后,其上部100.51 m载荷层同步破断,导水裂隙带导通宜君组含水层。②在向斜构造区俯采阶段,顶板覆岩具有多层亚关键层并形成多离层区。向斜轴部岩层破断角竖直发育,顶板破坏程度最高,压架风险最大。③顶板突水致使覆岩结构失稳是导致压架事故发生的关键。承压水对顶板岩层稳定性的影响主要表现为:增加了覆岩载荷传递的连续性,降低了组合亚关键层的承载能力;构成了组合亚关键层的附加载荷。④防止突水压架所需的支护阻力随承压水压力的增大而加速增加,工作面发生突水压架事故的临界承压水压力为0.98 MPa。控制导水裂隙带发育高度与降低宜君组承压水压力是保证工作面不发生压架事故的关键。

关键词：突水压架向斜构造相似材料模拟覆岩结构支架围岩关系

Effects of gully terrain on stress field distribution and ground pressure behavior in shallow seam mining

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International Journal of Mining Science and Technology 2016年第2期26卷 255-260页

作者： Li Jianwei liu changyou Zhao Tong School of Mines China University of Mining & Technology Key Laboratory of Deep Coal Resource Mining Ministry of Education China University of Mining & Technology

This study proposes a novel approach to study stress field distribution and overlying ground pressure behavior in shallow seam mining in gully *** approach combines numerical simulations and field tests based on the conditions of gully terrain in the Chuancao Gedan *** effects of gully terrain on the in situ stress field of coal beds can be identified by the ratio of self-weight stress to vertical stress(η) at the location corresponding to the maximum vertical *** on the function η =j(h),the effect of gully terrain on the stress field of overlying strata of the entire field can be characterized as a significantly affected area,moderately affected area,or non-affected *** face 6106 in the Chuancao Gedan Mine had a coal bed Jepth <80 m and was located in what was identified as a significantly affected ***,mining may cause sliding of the gully slope and increased loading(including significant dynamic loading) on the roof *** tests suggest that significant dynamic pressures were observed at the body and foot of the gully slope,and that dynamic loadings were observed upslope of the working face expansion,provided that the expanding direction of the working face is parallel to the gully.

关键词： Gully terrain Shallow seam Stress field Slope motion Ground pressure behavior

Effects of caving–mining ratio on the coal and waste rocks gangue flows and the amount of cyclically caved coal in fully mechanized mining of super-thick coal seams

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International Journal of Mining Science and Technology 2015年第1期25卷 145-150页

作者： Zhang Ningbo liu changyou Pei Mengsong State Key Laboratory of Coal Resources and Mine Safety China University of Mining and Technology School of Mines China University of Mining and Technology Key Laboratory of Deep Coal Resource Mining Ministry of Education China University of Mining and Technology

Aimed at determining the appropriate caving–mining ratio for fully mechanized mining of 20 m thick coal seam, this research investigated the effects of caving–mining ratio on the flow fields of coal and waste rocks, amount of cyclically caved coal and top coal loss by means of numerical modeling. The research was based on the geological conditions of panel 8102 in Tashan coal mine. The results indicated the loose coal and waste rocks formed an elliptical zone around the drawpoint. The ellipse enlarged with decreasing caving–mining ratio. And its long axis inclined to the gob gradually became vertical and facilitating the caving and recovery of top coal. The top coal loss showed a cyclical variation; and the loss cycle was shortened with the decreasing in caving–mining ratio. Moreover, the mean squared error(MSE) of the amount of cyclically caved coal went up with increasing caving–mining ratio, indicating a growing imbalance of amount of cyclically caved coal, which could impede the coordinated mining and caving operations. Finally it was found that a caving–mining ratio of 1:2.51 should be reasonable for the conditions.

关键词： Caving-mining ratioCoal and waste rocks flowsAmount of cyclically caved coalZone of loose coal and waste rocks

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Mining Science and Technology 2010年第5期20卷 718-722页

作者： LU Yan liu changyou School of Mines China University of Mining & Technology Xuzhou 221116 China State Key Laboratory of Coal Resources and Mine Safety Xuzhou 221008 China

In order to study the mechanism of bolt support and the behavior of strata in a coal roadway under tectonic stress,deformation and destruction of a roof,floor and sides were studied using an experiment in similarity *** also studied the mechanism and types of bolt support functions in the coal *** results show that with an increase in horizontal tectonic stress,the strata in the roof and floor of the roadway gradually separate and become shear failure *** in side walls moves,but its integrity remains *** bolts are mainly affected by tension and roof bolts by the effect of shear.

关键词： tectonic stress coal roadway bolt support similarity simulation

基于数据挖掘的中药外治法治疗背肌筋膜炎用药规律

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中国民族民间医药 2024年第18期33卷 5-9页

作者：刘长友祝宗华安徽中医药大学安徽合肥230000 安徽中医药大学附属铜陵中医医院安徽铜陵244000

目的:采用数据挖掘的技术分析中药外治法治疗背肌筋膜炎的用药规律,为临床背肌筋膜炎的中药外治提供科学依据。方法:检索建库至2023年9月中国知网、万方、维普等数据库中收录的中药外用治疗背肌筋膜炎的学术文献,录入符合要求的处方,采... 详细信息

目的:采用数据挖掘的技术分析中药外治法治疗背肌筋膜炎的用药规律,为临床背肌筋膜炎的中药外治提供科学依据。方法:检索建库至2023年9月中国知网、万方、维普等数据库中收录的中药外用治疗背肌筋膜炎的学术文献,录入符合要求的处方,采用Excel 2019建立中药数据库,运用古今医案云平台及数据分析软件SPSS Statistics 26.0、Cytoscape 3.10.0进行频数分析、关联规则分析、复杂网络分析及聚类分析。结果:纳入文献共涉及82个外用方,单个中药的使用频率≥20的共17味,关联规则得到12组核心用药组合;复杂网络分析得到核心药物为红花、川芎、威灵仙、透骨草、伸筋草;聚类分析发现3个有效聚类群。中药的性味以辛、苦味,温性药物为主;归经以肝经为主。结论:中医外治法治疗背肌筋膜炎的药物主要以辛、苦、温为主,治疗原则强调祛风除湿、活血止痛。

关键词：背肌筋膜炎中医外治法数据挖掘用药规律

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