辽宁瓦房店金刚石矿床50号岩管地质特征及找矿预测     

刘礼广  吴大天 《中国地质调查》2020,7(5):33-41

以辽宁瓦房店金刚石矿床50号岩管为例,系统分析了该矿床的地质特征。通过对斑状富金云母金伯利岩、含围岩角砾斑状金伯利岩和金伯利凝灰角砾岩进行岩石地球化学分析发现: 碳酸盐化金伯利凝灰角砾岩超基性成分较少,滑石化、蛇纹石化及碳酸盐化混合金伯利凝灰角砾岩超基性成分较多; 铬、镍、钛在金伯利凝灰角砾岩中的含量较低,在含围岩角砾斑状金云母金伯利岩中的含量略高,在斑状富金云母金伯利岩和斑状金伯利岩中的含量最高。该矿床主要为含围岩角砾斑状金伯利岩和斑状富金云母金伯利岩,其次为金伯利凝灰角砾岩、含围岩角砾斑状金云母金伯利岩和含金伯利物质角砾岩。含铬镁铝榴石、铬铁矿和碳硅石是金刚石的伴生矿物。水平方向上,金伯利岩含矿品位西部较富,东部较贫; 垂直方向上,金伯利岩含矿品位变化较小。通过三维建模,推测50号岩管不是根部相,而是受EW向推覆构造作用影响发生的断层错位,在其东侧600 m深处存在50-1号金伯利岩体。  相似文献   

磁浮交通试验线压力管道直线度的测量方法研究及应用     

韩冰  刘成龙  杨雪峰 《测绘通报》2019,(6):126-130,135

目前，国内外对于磁浮交通真空压力管道直线度测量问题的研究较少。本文结合西南交通大学在建的真空磁浮高速列车试验装置，提出了一种真空压力管道直线度测量方法。该方法在管道内建立高精度三维控制网，依据三维控制网测量采用圆曲线拟合方法确定各节管道的圆心坐标，并采用直线拟合方法分析整个管道的直线度。最后依据上述方法编制程序对实测数据进行了处理分析，验证了方法的可行性和正确性，可为今后真空磁浮压力管道的建设提供技术参考。  相似文献   

A literature synthesis of LiDAR applications in transportation: feature extraction and geometric assessments of highways     

Suliman A. Gargoum  Karim El Basyouny 《地理信息系统科学与遥感》2019,56(6):864-893

Interest in using Light Detection and Ranging (LiDAR) technology in Transportation Engineering has grown over the past decade. The high accuracy of LiDAR datasets and the efficiency by which they can be collected has led many transportation agencies to consider mobile LiDAR as an alternative to conventional tools when surveying roadway infrastructure. Nonetheless, extracting semantic information from LiDAR datasets can be extremely challenging. Although extracting roadway features from LiDAR has been considered in previous research, the extraction of some features has received more attention than others. In fact, for some roadway design elements, attempts to extract those elements from LiDAR have been extremely scarce. To document the research that has been done in this area, this paper conducts a thorough review of existing studies while also highlighting areas where more research is required. Unlike previous research, this paper includes a thorough review of the previous attempts at data extraction from LiDAR while summarizing the detailed steps of the extraction procedure proposed in each study. Moreover, the paper also identifies common tools and techniques used to extract information from LiDAR for transportation applications. The paper also highlights common limitations in existing algorithms that could be improved in future research. This paper represents a valuable resource for researchers and practitioners interested in knowing the current state of research on the applications of LiDAR in the field of Transportation Engineering while also understanding the opportunities and challenges that lie ahead.  相似文献   

强造斜致绳索取心钻具折断分析     

卢秋平 《地质与勘探》2020,56(2):445-450

在定向钻探固体矿产领域,通常在造斜段使用螺杆钻具,大部分的工作量采用取心回转钻进。造斜段使用螺杆钻具,钻杆不回转,受力较简单;如遇强造斜转换绳索取心钻具稳斜钻进,下部钻具组合容易出现回转困难、下不到底的技术难题,甚至出现丝扣折断事故。为避免强造斜对绳索取心钻具的影响,本文通过建立强造斜段对绳索取心钻具的几何约束变形模型,量化分析强造斜段岩心外管长度与造斜强度、环空间隙之间的约束关系,提供了可快速预判下部钻具参数能否满足强造斜安全钻进的方法。该方法在山东某铁矿定向孔的强造斜致下部钻具折断的事故处理中,通过对绳索取心钻具安全计算模型校核和调整钻具参数,实现了绳索取心钻具通过造斜率0.62°/m的强造斜段安全钻进至靶点,证明对强造斜绳索取心工具安全钻进预测和事故处理计算具有指导意义。  相似文献   

高效钻杆润滑脂研制及其在川藏铁路勘察中的应用          下载免费PDF全文

熊正强  陶士先  张德龙  邹志飞 《探矿工程》2020,47(11):7-11

针对地质钻探深孔或水平孔失返性漏失时钻具磨损及钻进效率低的问题，以白油、钠基稠化剂与粘结性材料等为原料，采用一步法研制了一种高效钻杆润滑脂，并在川藏铁路昌都段定测勘察水平孔现场应用中取得显著效果，有力支撑服务了川藏铁路大位移水平孔施工。室内评价及现场应用结果表明，该润滑脂具有耐低温（-16 ℃）、易涂抹、良好的粘附性与润滑性以及高性价比特点，能长时间保护钻具，而且其润滑效果与国外同类产品相当。  相似文献   

Current-induced scour beneath initially elevated subsea pipelines     

《Applied Ocean Research》2019

When a subsea pipeline is laid on an uneven seabed, certain sections may have an initial elevation with respect to the far-field seabed, e_o, and thus potentially affecting the on-bottom stability of the pipeline. This paper focuses on quantifying the effects of the upstream dimensionless seabed shear stress, θ_∞, and Reynolds number, Re, on: (1) the maximum dimensionless seabed shear stress beneath the pipe, θ_max, to be compared to the critical shear stress in order to determine whether scour would occur and progress towards an equilibrium state; and, (2) the dimensionless equilibrium scour depth beneath the pipe, S_eq/D. Using a 2-D Reynolds averaged Navier-Stokes (RANS) approach along with the k-ω Shear Stress Transport (SST) turbulence model, a parametric study involving 243 computational fluid dynamics (CFD) simulations was conducted. The simulation results were used to develop a closed-form equation for the prediction of θ_max. Subsequently, experimental measurements of S_eq/D have been compiled from published literature, to develop a new closed-form equation for the prediction of S_eq/D with a high correlation to the experimental data. In summary, we present two closed-form equations for the prediction of θ_max and S_eq/D for pipelines with an initial e_o/D, which are applicable for both clear-water and live-bed conditions. The effects of θ_∞ and Re have been included, albeit Re having a small influence as compared to the other parameters.  相似文献   

Torsional dynamic response of a large‐diameter pipe pile in viscoelastic saturated soil     

Changjie Zheng  Hanlong Liu  Xuanming Ding  Yaru Lv 《国际地质力学数值与分析法杂志》2014,38(16):1724-1743

An analytical solution is developed in this paper to investigate the dynamic response of a large‐diameter end‐bearing pipe pile subjected to torsional loading in viscoelastic saturated soil. The wave propagation in saturated soil and pile are simulated by Biot's two‐phased linear theory and one‐dimensional elastic theory, respectively. The dynamic equilibrium equations of the outer soil, inner soil, and pile are established. The solutions for the outer and inner soils in frequency domain are obtained by Laplace transform technique and the separation of variables method. Then, the dynamic response of the pile is obtained on the basis of the perfect contacts between the pile and the outer soil as well as the inner soil. The results in this paper are compared with that of a solid pile in elastic saturated soil to verify the validity of the solution. Furthermore, the solution in this paper is compared with the classic plane strain solution to verify the solution further and check the accuracy of the plane strain solution. Numerical results are presented to analyze the vibration characteristics and illustrate the effect of the soil parameters and the geometry size of the pile on the complex impedance and velocity admittance of the pile head. Finally, the displacement of the soil at different depth and frequency is analyzed. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

HCW-90型全液压自动猫道钻杆支架起升同步性分析          下载免费PDF全文

盛洁  王清岩  钟蔚岭  李铠君  金赠伍 《探矿工程》2021,48(S1):316-323

本文针对HCW-90型全液压自动猫道的钻杆支架起升过程进行研究,采用多体动力学与液压控制系统联合仿真方法,分析了钻杆支架起升液压缸动作的同步性对钻杆从支架末端运动至平台档销限位处的动态过程的影响。重点讨论了起升液压缸同步性对管体空间位姿、动力学参数、管体运动至终了处与档销碰撞过程。进一步分析了管体受到限位后趋于稳定的动态过程和定位精度。此外,综合考虑管体运移的快速性、平稳性和定位准确性,对起升液压缸的液压控制系统的输入信号进行了合理调整,并在满足工作性能的前提下,提出了采用分流阀构建低成本液压控制系统的方案。  相似文献   

护坡桩+微型钢管桩复合土钉墙联合支护体系研究应用          下载免费PDF全文

孙剑  范民浩  李鑫 《探矿工程》2021,48(10):116-124

本文提出了一种新的联合支护体系——护坡桩+微型钢管桩复合土钉墙支护体系,成功解决了基坑周边无放坡空间需垂直开挖、基坑深度大、要求位移小、支护费用高等技术难题,做到了施工便利,对控制边坡位移变形、增强边坡整体稳定性、保证在基坑开挖工程中不发生对周围环境的影响具有良好的作用。采用这种支护方式对北京一工程进行设计施工探讨,经工后监测效果良好,大大地提高了边坡的安全稳定性,从而验证了这一支护形式的可行性,其在深基坑支护中具有常规土钉墙和护坡桩无法相比的技术与经济优势,可供其他类似工程参考,具有较高的适用推广价值。  相似文献   

冰层空气反循环快速钻进方法及冰屑运移研究          下载免费PDF全文

董硕  贺文博  曹金娥  王孟克  陈宝义  曹品鲁 《探矿工程》2021,48(1):49-56

空气反循环钻进技术具有钻速快、能耗低、可不提钻连续取心取样、能有效避免积雪层漏失等优点,在冰层钻探中极具应用潜力。本文针对冰层钻探技术特点,提出了双壁钻杆式、双通道高压胶管式和寄生高压胶管式等三种空气反循环冰层钻探技术,分别介绍了其工作原理及特点。基于气力输送和气体钻井基本理论,对冰屑颗粒气体介质中的悬浮速度进行了分析,建立了单颗粒冰屑悬浮、运移方程和冰屑颗粒群悬浮方程,并设计了冰屑悬浮实验台,对冰屑悬浮所需的风速进行了实验测试。理论计算值与实验实测值吻合较好,最大误差约10.91%,可用本文建立的冰屑运动方程来计算实际钻进时携带冰屑所需的风量,为后续在极地实施冰层空气反循环钻进技术提供了依据。  相似文献