线型加载问题在采矿CAD中的应用

结合采矿专业有关线型,本文通过对AutoCAD线型文件、线型格式和线型加载方式等做了简单描述,重点介绍了复杂线型加载问题,根据需要自定义专业线型能起到事半功倍的效果。     

创建AutoCAD线型初探

从线型的定义出发,阐述了创建普通线型和字符型线型的方法.     

AutoCAD自定义矿业类线型在绘制矿图中的应用

通过对AutoCAD软件中线型文件的结构、线型语言格式及代码含义的分析,结合矿图绘制中所需矿业类特殊线型符号的特点,自定义了具体线型及矿业类线型文件,详述其加载方法和调用技巧。实践证明,利用自定义的矿业类特殊线型绘制矿图时,提高了绘图质量,加快了绘制速度,并对软件的升级与开发有一定的指导意义。     

在AutoCAD中定制特殊线型的方法

从AutoCAD线型文件的结构和语法分析入手,按照编制线型的基本原则,以采矿工程图中常用的断层下盘线线型为例,介绍定制采矿工程专用线型的方法.     

用AutoCAD自定义地质线型与岩性符号填充图案

该文以地质线型与岩性符号为例,介绍了利用AutoCAD为开发平台以该公司提供的ObjectARX开发包作为支撑库实现自定义地质线型与岩性符号填充图案AutoCAD,最终实现定制特有线型、建立自主线型库与填充图库,提高作图速度与质量的研究目的。     

AutoCAD地质线型的定制和使用

AutoCAD线型库中很少或根本没有可供使用的地质制图常用线型,要使用AutoCAD绘制地质图,必须定制地质线型,本文简要讨论AutoCAD地质线型的定制和使用方法。     

CAD在煤矿制图中的线型问题探究

AutoCAD作为一款功能强大、绘图精度高的计算机辅助设计绘图软件,已被广泛地运用于煤矿制图中。不过AutoCAD并不是专门为煤矿制图设计的绘图软件,导致在实际的应用过程中会出现一些问题,其中线型问题特别突出。在AutoCAD的线型库中只有很少的标准线型,并不能满足煤矿制图对于线型的需求。文章将对AutoCAD在煤矿制图中的线性问题进行分析与探讨,拟通过自定义线型的使用方法进行说明以及实际操作步骤,从而提高煤矿制图人员的工作效率,同时对线型自定义实际操作过程中出现的部分问题进行归纳总结。     

谈采矿常用线型制作和使用方法

在煤矿采矿工程图的绘制过程中,经常遇到一些新的线型,而AutoCAD本身提供的线型又不能满足采矿绘图的需要,介绍采矿常用线型的制作方法,以方便采矿工程技术人员的绘图工作。     

AutoCAD自定义矿图线型

通过对AutoCAD文件中线型结构、线型语言格式以及代码分析,特别是对于较难理解的Auto-CAD形文件(.shx文件)的理解,结合煤矿地质测量矿图绘制所需的几种特殊线型,总结出了CAD中自定义线型的方法以及加载应用的技巧,实践证明通过使用AutoCAD自定义线型的应用.明显提高了矿图绘制效率,提高了矿图质量,使其更符合<煤矿地质测量图例>的标准,具有一定借鉴推广意义.     

AutoCAD线型开发在露天矿图数字化中的应用

随着计算机技术的迅速发展和在生产生活中的广泛应用,矿山企业图纸资料的数字化显得十分重要,这又是一项复杂的工作。通常的AutoCAD线型库中的线型不能完全满足采矿作图的线型要求,为了提高工作效率,本文介绍了AutoCAD中线型开发的方法步骤,以便开发适合自身使用的线型,简化绘图。     

微地震监测技术在回采工作面矿压显现规律中的应用

工作面回采导致上覆岩层破坏,上覆岩层的破坏与煤矿顶底板突水、冲击地压、煤与瓦斯突出等事故发生密切相关,对回采工作面矿压显现规律的研究是保障煤炭安全开采的关键之一。回采工作面在覆岩破坏过程中,由于应变能的释放,产生相应强度较弱的地震波（微地震波）。微地震监测技术能够实现实时动态三维空间的整体监测。对鲁西煤矿3_上107工作面回采过程中覆岩破坏产生的微地震事件进行了监测,通过对监测到的微地震事件定位计算,证实微地震发展演化与采场覆岩破坏密切相关。鲁西煤矿3_上107工作面矿压显现规律的微地震监测分析表明,顶板来压时微地震事件数达到高峰,顶板的来压完成时微地震事件数下降,据此得出3_上107工作面基本顶来压步距为23.3 m。与通过现场实测得出的基本顶来压步距24.3 m基本吻合,说明采用微地震监测技术研究回采工作面显现规律是可行的,从而为回采工作面矿压显现规律的研究提供了一种新的技术途径。     

新型带式输送机转弯装置在煤矿生产中的应用

带式输送机转弯装置可以减少运输系统转载环节,减少设备和人员的投入。郑煤集团教学二矿设计并使用了一种新型带式输送机转弯装置,装置主要由转向滚筒、改向滚筒、机架、接料装置等组成,具有0~180°任意转弯、运行阻力大幅度下降、结构模块化设计及安装简单、调试方便、维护简便等特点,该设备在郑煤集团教学二矿中取得了良好的应用效果,解决了以往使用的拐弯胶带存在的问题,实现了设备的安全经济运转,具有较好的推广应用价值。     

地下空洞塌陷影响因子的灵敏度分析

地下空洞塌陷是引起路面变形破坏的主要原因。为了研究地下空洞塌陷影响因子的灵敏度,通过有限元软件ABAQUS建立数值模型,基于数值模拟的结果,采用灰色关联法计算各影响因子对地下空洞塌陷引起路面沉降位移的影响灵敏度,影响因子取土体内聚力、土体内摩擦角、土体弹性模量、地表荷载、地下空洞覆跨比、地下空洞跨径和地下空洞高度。得出各因子对地下空洞塌陷引起路面沉降位移的影响灵敏度依次为:地下空洞覆跨比>土体内摩擦角>地表荷载>土体内聚力>土体弹性模量>地下空洞高度>地下空洞跨径。     

整体式多路换向阀阀芯结构研究

阀芯上阀肩与阀体之间的配合,阀芯上节流槽、均压槽的设计等直接影响整个阀的使用性能和阀的使用寿命。研究对象为矿用装岩机机械液压系统整体式多路换向阀中回转联滑阀阀芯的结构。剖解整体式多路换向阀阀芯的结构,对阀芯节流口的面积进行数学分析,并利用减小阀芯所受径向力的方法对阀芯结构、节流槽、均压槽进行研究。重点研究阀杆上的节流槽、均压槽等阀杆的微小结构对阀使用性能的影响。研究对阀杆的设计具有重要的参考价值。     

中水系统加酸位置研究

电厂中水系统处理采用石灰、混凝澄清、过滤、加酸的处理方式，设置机械加酸澄清池、双室过滤器和软水池，加酸点位置2个，双室过滤器出口混合器处加酸和澄清池出口混合器处加酸，但由于浓硫酸稀释后较强的腐蚀性，加酸管道经常出现泄漏，直接影响中水系统安全稳定运行。通过经验总结与实践，将中水加酸点由原来的澄清池出口混合器更改至澄清池顶部出口集水槽汇流口处，加酸管悬于水平面上方。这样可以使加酸管不再浸入水内加酸而是在水面以上加酸，有效避免了加酸点的腐蚀和泄漏；集水槽汇流口处有1 m高的落差，在水流下降过程中会伴随着向上排气和旋转，水速比较高，水流混合相对均匀，浓硫酸在此处加入后可以立即发生稀释反应，可以将澄清池出水的pH值迅速调整至8左右，正常运行的情况下，不会造成设备的腐蚀；集水槽汇流口位于澄清池顶部清水区，即使在操作不当的情况下集水槽汇流口外壁腐蚀也不会造成中水系统必须立即停运等问题的出现，将加酸点变更至此处，大大提高了中水系统的安全性；中水系统加酸设备和管道运行情况可以直接观察、分析判断，有利于运行与检修人员及时发现和处理隐患；系统变动比较小，易于实现，不影响原有在线仪表的测量使用。     

废催化剂中钼、钒回收工艺的研究

比较了加碱焙烧浸出和焙烧碱浸方法。选择焙烧碱浸工艺进行试验,使用碳酸钠为浸出剂,考察了焙烧温度、焙烧时间及碳酸钠浓度等条件对钼、钒浸出率的影响。确定焙烧温度为650℃,焙烧3 h,碳酸钠加入量为50 g/L的一次逆流浸出工艺,在该工艺下钼的浸出率达91%,钒的浸出率达77.17%。考察沉降温度及氯化铵浓度对钒的沉降率的影响,确定温度在80～90℃,氯化铵浓度为90 g/L时,钒的沉降率达到97%。     

Modeling of Wave Propagation in Block Media

Propagation of strain waves is experimentally investigated under impact loading of a rod system composed of steel cylinders separated by pliable interlayers. The existence of pendulum-type waves is confirmed. In order that wave process in the rod system is numerically described, a viscoelastic model of deforming materials of interlayers used in the experiment is constructed. It is shown that the velocity of waves and the degree of their attenuation are to a great extent dependent on viscous properties of the material of interlyers.__________Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 49–57, November–December, 2004.     

Determination of a potential set of factors which influence the situation of methane emission into roadways being driven

The currently applied methodology of absolute gassiness forecasting in roadways being driven in Polish hard coal mines is based on the results of investigations from before more than twenty years. At present the roadways are being driven in majority of cases in quite different conditions than those which had been the subject of the said investigations. The application of “old” methods of forecasting of methane emission during driving of roadways often brings about great discrepancies between the results of the forecasts and actual situation. It is firstly necessary to determine a potential set of factors which exert an influence on situation regarding methane emission into roadways being driven in order to prepare a verified mathematical model of absolute gassiness forecasting. On the basis of available literature and the investigations conducted by the Central Mining Institute an initial list of factors has been prepared which can have an impact upon methane emission into roadways being driven. The assumptions of heuristic method have been taken advantage of for selection of parameters and indices describing the phenomenon of methane emission. It has been dictated by the fact that the available literature is lacking a pretty unambiguous viewpoint on the subject under consideration and at the same time it is necessary to perform an a priori assessment of the information contained in a given feature (factor). A prepared initial set has been scrutinized to be verified on the basis of a conducted expert survey among seventy specialists in this field. After collecting of the results of the survey their statistical elaboration was prepared. The co-efficient of agreement of multiple ordering, the so called concordance co-efficient has been taken advantage of in order to check the competency of experts. The investigations prove that the experts are in agreement in their opinions. The estimation of a collective assessment of all participants of the survey was conducted with the use of the rank sum’s test by J. Greń. The results of the conducted analysis allowed determining a potential set of factors which influence the situation of methane emission into roadways being driven. This set, after conductance of further detailed investigations, can constitute a base for elaboration of a function describing methane emission into roadways being driven in hard coal mines.     

Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment

For pretreatment of selective flotation, plasma treatment of chalcopyrite and molybdenite was applied then the minerals were washed by solution at pH 9 with oxygen bubbling. Surface characteristics of these minerals were investigated with AFM, XPS, zeta potential and contact angle measurements. Contact angle of chalcopyrite and molybdenite decreased a lot by plasma treatment. When they were washed with pH 9 solution with oxygen bubbling, contact angle of molybdenite increased whereas chalcopyrite one kept low. Adhesion force measurements indicated similar behavior. Result of flotation experiments indicated low recovery of both chalcopyrite and molybdenite after plasma treatment and only molybdenite recovery became higher after washing. Selective flotation of chalcopyrite and molybdenite could be achieved with this process. However, flotation of mixture of chalcopyrite and molybdenite after these treatments indicated both chalcopyrite and molybdenite were depressed. Addition of emulsified kerosene changed the flotation results where molybdenite was floated and chalcopyrite was depressed. Possible mechanism of selective flotation was proposed from the results of XPS, AFM, etc.     

基于极限分析的三维边坡可靠度研究

基于极限分析上限法提出了非相关联流动法则速度场下三维边坡的安全系数计算方法与可靠度计算模型,该方法有效地避免了在求解相关联法则速度场时,由于摩擦角过大会出现的速度场不收敛问题。基于双对数螺旋线破坏机制,考虑土体参数的空间变异性,提出的可靠度计算方法,相对于二维计算模型能够更加精确地计算边坡的失效概率。最后结合算例讨论了土体参数变异系数对三维边坡可靠度的影响。结果表明,边坡的失效概率随着土体参数c、φ值变异系数的增加而增大,其中c值变异系数对失效概率影响显著,φ值变异系数对失效概率影响相对较小。