空隙率对潜孔锤凿岩瞬态冲击过程的影响          下载免费PDF全文

卜长根  龚汉松  夏柏如 《探矿工程》2011,38(4):6-9

潜孔锤的钻进过程是一个高度非线性、大变形、破碎岩石的过程,利用非线性有限元程序ANSYS/LS-DY-NA研究了在凿岩过程中,球齿凿入不同空隙率（塑性体积应变）岩石的冲击力特性。结果表明,岩石空隙率对钻头球齿与岩石之间的凿入冲击力幅值有很大影响,随着空隙率的增大,球齿凿入的冲击力显著减小,而对活塞与钻头间冲击力幅值影响甚微。通过ANSYS/LS-DYNA瞬态冲击数值模拟,形象地再现了潜孔锤钻凿系统冲击岩石发生侵入破坏的物理过程,为冲击碎岩瞬态研究提供了一个有效的分析方法。  相似文献   

SYZX系列绳索取心液动锤在新余梅山煤矿易斜深孔防斜钻进中的应用          下载免费PDF全文

赵华 《探矿工程》2011,38(9):27-29

为了解决江西新余梅山煤矿深孔勘查中存在的孔斜问题,采用绳索取心液动锤钻进为主的防斜工艺,优化钻具结构组合,合理地选择钻进技术参数和措施,在该矿区取得了明显的减斜防斜效果。总结了SYZX系列绳索取心液动锤在江西新余梅山煤矿勘查深孔施工中的防斜经验。  相似文献   

Younger Dryas glaciers and climate in the Mourne Mountains,Northern Ireland     

《第四纪科学杂志》2017,32(1):104-115

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How does anisotropy in bedrock river granitic outcrops influence pothole genesis and development?          下载免费PDF全文

Jose Ortega‐Becerril  Miguel Gomez‐Heras  Rafael Fort  Ellen Wohl 《地球表面变化过程与地形》2017,42(6):956-968

Pothole formation and development may be influenced by joint sets and other heterogeneities within bedrock, as well as by hydraulics. Previous research indicates that most potholes found in rivers of the mountainous Spanish Central System exhibit preferred orientations associated with dominant joints and correlate more strongly with variations in substrate resistance than with hydraulics. Weathering and erosion weaken rock surfaces, which leads to decreased mechanical resistance. We start from the hypothesis that different mechanisms of pothole formation may create around the pothole a distinctive signature in terms of ultrasound pulse velocity and surface hardness. We develop a conceptual model and test it using potholes for which we know the mechanism of formation, demonstrating that the spatial and statistical distributions of dynamical mechanical properties and surface hardness of a pothole may provide insight into its genesis. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Magma chamber growth models in the upper crust: A review of the hydraulic and inertial constraints     

Eugenio Aragón  Fernando J.D'Eramo  Lucio P.Pinotti  Manuel Demartis  José María Tubía  Roberto F.Weinberg  Jorge E.Coniglio 《地学前缘(英文版)》2019,10(3):1211-1218

Finite volumes of magma moving in confinement, store hydraulic potential energy for the generation,control and transmission of power. The Pascal's principle in a hydraulic jack arrangement is used to model the vertical and lateral growth of sills. The small input piston of the hydraulic jack is equivalent to the feeder dike, the upper large expansible piston equivalent to the magmatic chamber and the inertial force of the magma in the dike is the input force. This arrangement is particularly relevant to the case of sills expanding with blunt tips, for which rapid fracture propagation is inhibited. Hydraulic models concur with experimental data that show that lateral expansion of magma into a sill is promoted when the vertical ascent of magma through a feeder dike reaches the bottom contact with an overlying, flat rigid-layer. At this point, the magma is forced to decelerate, triggering a pressure wave through the conduit caused by the continued ascent of magma further down(fluid-hammer effect). This pressure wave can provide overpressure enough to trigger the initial hydraulic lateral expansion of magma into an incipient sill, and still have enough input inertial force left to continue feeding the hydraulic system. The lateral expansion underneath the strong impeding layer, causes an area increase and thus, further hydraulic amplification of the input inertial force on the sides and roof of the incipient sill, triggering further expansion in a self-reinforcing process. Initially, the lateral pressure increase is larger than that in the roof allowing the sill to expand. However, expansion eventually increases the total integrated force on the roof allowing its uplift into either a laccolith, if the roof preserves continuity, or into a piston bounded by a circular set of fractures. Hydraulic models for shallow magmatic chambers, also suggest that laccolith-like intrusions require the existence of a self-supported chamber roof. In contrast, if the roof of magmatic chambers loses the self-supporting capacity, lopoliths and calderas should be expected for more or less dense magmas, respectively, owing to the growing influence of the density contrast between the host rock and the magma.  相似文献   

基于LSDYNA的射流式液动锤回程动力 外传机构研究          下载免费PDF全文

张鹏飞  程靖清  葛东  彭枧明 《探矿工程》2019,46(2):71-74,85

设计一种改变冲击应力波在射流式液动锤内传播途径的结构,分析在不同传播途径中应力波衰减程度的改变,基于LSDYNA显式动力学分析方法,对冲锤回程阶段进行仿真分析,探究冲锤回程冲击在液动锤内两种不同传播途径的模型中射流元件受到的应力变化。研究表明,动力外传机构通过避免对缸体上部的刚性碰撞,能大大降低射流元件所受到的冲击应力,并且外传机构的几何参数对应力的衰减也有一定的影响。  相似文献   

水压式凿岩破碎冲击器的研究          下载免费PDF全文

杨红东  郑传峰  计胜利  侯传斌 《探矿工程》2010,37(10):74-77

水压式凿岩破碎冲击器与液动冲击器的工作机理有着本质的区别,它有着很高的工作效率和能量转换率,凿岩速度大大高于气动潜孔锤,但这种水压冲击器不适合泥浆驱动。转阀式水压冲击器的配流不同于以往的配流方式,可能更适合泥浆介质驱动。  相似文献   

偏心跟管钻具钻进的仿真分析          下载免费PDF全文

罗宏保  宋军  赵建勤  黄晓铭 《探矿工程》2010,37(11):6-8

针对偏心跟管钻具工作环境与受力作用复杂的情况,通过建立跟管钻具在地层中钻进的有限元模型,设定各种边界条件及载荷,运用有限元分析软件ANSYS 12.0对跟管钻具的钻进工况进行仿真模拟,分析钻具在钻进时与地层岩土体相互作用下的应力应变情况。根据模拟分析结果能够更清楚地了解钻具钻进时的应力状态,并对钻具的设计、优化起到指导性作用以及为钻具设计结构的合理性提供了理论依据。  相似文献   

RE400型履带式潜孔锤钻机的研制          下载免费PDF全文

于传江  王海盈 《探矿工程》2012,39(8):39-41

介绍了RE400型履带式多功能潜孔锤钻机的研制过程和总体结构布局设计,分别叙述了钻机主要组成部分的功能、结构特点、工作原理及该钻机的试验和应用情况。  相似文献   

空气潜孔锤钻进技术在援豫抗旱找水成井施工中的应用   总被引：7，自引：0，他引：7  

陈怡 《贵州地质》2012,29(2):128-131

介绍了空气潜孔锤钻进技术在援豫抗旱找水成井施工中的使用情况、成井工艺及孔内事故处理情况,分析了钻探效益,总结了该次施工取得的经验,得出在河南省太行山区,在无水情况下,运用空气潜孔锤钻进成井工艺取得成功,并可大幅提高钻进效率,保证成井质量,同时降低施工成本,提出今后河南省太行山区深部打井施工中增配专门钻机和增压机的建议。  相似文献