城市地下管网普查物探方法分析与验证     

刘子嘉  薛晓轩 《测绘与空间地理信息》2015,(12)

地下管网是城市正常运转的基础设施,承载着城市各种物质流、能源流和信息流,保证了城市的有序运转和居民的正常生活。探测地下管线的主要设备是英国雷迪RD8000,但这种设备恰巧是测绘仪器检定的盲区。为保证探测精度,需对物探方法进行分析,对设备进行校验,对不同埋深、不同地电条件下金属管线探测的工作参数进行试验,对探测仪性能、方法、最佳收发距离进行综合评定,旨在最大限度地发挥探测仪的潜能,从而保证地下管网的探测精度。  相似文献   

φ71 mm绳索取心铝合金钻杆的研制   总被引：1，自引：1，他引：0       下载免费PDF全文

张喜超 《探矿工程》2015,42(7):58-61，71

介绍了国内外铝合金钻杆的研制现状,分析了绳索取心铝合金钻杆在地质钻探中的优势。对φ71 mm×5.5 mm绳索取心铝合金钻杆体与钢接头连接结构进行了详细设计。通过对试验钻杆进行静拉力、扭矩试验,得出了铝合金钻杆体与钢接头主要技术参数。  相似文献   

卵漂石地层深基坑高压旋喷桩止水帷幕施工工艺          下载免费PDF全文

鲁鸿福  王丽梅 《探矿工程》2015,42(8):80-84

结合青海省微电机厂棚户区改造项目深基坑止水帷幕施工的成功经验,总结出卵漂石地层深基坑双排单重管高压旋喷桩止水帷幕施工的施工工艺及技术要点。  相似文献   

土体约束对海底管道整体屈曲的影响机理研究     

李成凤  刘润  彭碧瑶  王秀妍 《海洋科学》2018,42(2):56-63

高温高压下海底管道的整体屈曲稳定性分析是管道设计的重要组成部分,而选取多长的管道进行分析对其整体屈曲稳定性结果影响显著。依据临界管长将管道分为"长管"与"短管",基于动力显式分析方法,揭示了长管与短管在发生整体屈曲过程中,屈曲幅值与波长、管壁轴向压力、轴向应变及轴向位移的变化规律;研究了土体约束力影响管道临界长度的规律性,分析了土体约束力系数对长管与短管整体屈曲变形的影响。研究发现,土体约束力对短管的整体屈曲行为影响显著,短管的整体屈曲幅值随土体约束力系数的增大呈现先增大后减小的趋势。该项研究对区分不同长度管道的整体屈曲类型进而采取有效防控措施具有重要参考价值。  相似文献   

Lateral dynamic response of a pipe pile in saturated soil layer          下载免费PDF全文

Changjie Zheng  Hanlong Liu  Xuanming Ding 《国际地质力学数值与分析法杂志》2016,40(2):159-184

This paper presents an analytical solution for the lateral dynamic response of a pipe pile in a saturated soil layer. The wave propagations in the saturated soil and the pipe pile are simulated by Biot's three‐dimensional poroelastic theory and one‐dimensional elastic theory, respectively. The governing equations of soil are solved directly without introducing potential functions. The displacement response and dynamic impedances of the pipe pile are obtained based on the continuous conditions between the pipe pile and both the outer and inner soil. A comparison with an existing solution is performed to verify the proposed solution. Selected numerical results for the lateral dynamic responses and impedances of the pipe pile are presented to reveal the lateral vibration characteristics of the pile‐soil system. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

A 3D discrete FEM iterative algorithm for solving the water pipe cooling problems of massive concrete structures          下载免费PDF全文

Jing Cheng  T. C. Li  Xiaoqing Liu  L. H. Zhao 《国际地质力学数值与分析法杂志》2016,40(4):487-508

Water pipe cooling has been widely used for the temperature control and crack prevention of massive concrete structures such as high dams. Because both under‐cooling and over‐cooling may reduce the efficiency of crack prevention, or even lead to great harm to structures, we need an accurate and robust numerical tool for the prediction of cooling effect. Here, a 3D discrete FEM Iterative Algorithm is introduced, which can simulate the concrete temperature gradient near the pipes, as well as the water temperature rising along the pipes. On the basis of the heat balance between water and concrete, the whole temperature field of the problem can be computed exactly within a few iteration steps. Providing the pipe meshing tool for building the FE model, this algorithm can take account of the water pipe distribution, the variation of water flow, water temperature, and other factors, while the traditional equivalent algorithm based on semi‐theoretical solutions can only solve problems with constant water flow and water temperature. The validation and convergence are proved by comparing the simulated results and analytical solutions of two standard second‐stage cooling problems. Then, a practical concrete block with different cooling schemes is analyzed and the influences of cooling factors are investigated. In the end, detailed guidance for pipe system optimization is provided. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

塔河油田地面工程信息系统的设计与探讨     

申成祎 《测绘与空间地理信息》2010,33(1):122-123,126,130

着重探讨了塔河油田地面工程信息系统的建设思路和实现方法,针对油田的实际,以当前先进的组件式地理信息系统软件MAPGIS和可视化编程工具Microsoft Visual Studio构架的技术体系为基础,开发一套方便实用的油田地面工程信息系统。本系统建设为集原油集输、天然气和油田伴生气集输、道路、输供电线路为一体的可视化数据平台,实现了整个油田数据采集、管线图绘制,以及信息的浏览、查询统计、综合管理等功能。  相似文献   

基于GIS的化学品管道输送监控预警系统研究与开发     

王婧  赵冬泉  王浩正  罗睿 《测绘软科学研究》2010,(6):66-71

管道输送以其效率高、成本低等优势在化工企业与园区中得到广泛应用。管道输送的规范管理和安全监控是管道高效安全运行的基础保障。本研究根据天津临港工业区管廊数据管理和管道泄漏检测的实际需求,设计开发了化学品管道输送监控预警系统,将GIS技术和泄漏检测模型有机集成,实现了数据的统一管理和综合查询、管道运行的远程监控和管道泄漏检测及空间定位等功能,可有效提高管廊系统日常管理效率和事故决策分析水平。系统以＂方案＂的形式组织管理所有数据,可适用于其他地区管廊的监控管理,具有较好的可推广性。  相似文献   

Study on low‐strain integrity testing of pipe‐pile using the elastodynamic finite integration technique     

Zhi Tang Lu  Zhi Liang Wang  Dong Jia Liu 《国际地质力学数值与分析法杂志》2013,37(5):536-550

This study focuses on the three‐dimensional (3‐D) characteristics of wave propagation in pipe‐pile using elastodynamic finite integration technique. First, a real 3‐D pile‐soil model in cylindrical coordinate system is presented. Then, the governing equations are established. With the boundary and initial conditions, the numerical solution is obtained. The accuracy and feasibility of the self‐written code are further verified via comparing with the measured data. Velocity histories at different angles of pile top and pile tip are illustrated, and the snapshots reflecting the 3‐D characteristics of wave propagation are given. It shows that the interferences of Rayleigh waves can confuse the result interpretation for pile integrity testing. The increase of hammer contact time can effectively mitigate the interferences, and the interferences of Rayleigh waves are weakest at an angle of 90° from where hammer hits. Besides, surrounding soil can partly mitigate the wave interferences. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

新型全封闭刀口联合式管口封的设计及应用     

韩贻兵  臧启运  徐孝诗 《海岸工程》2003,22(2):92-96

重力活塞取样器是海洋地质调查不可缺少的调查设备，而管口封又是重力活塞取样器的重要部件。管口封的好坏不但影响到取样器的贯入深度和取芯丰，还影响到所取岩芯的质量．介绍了一种最近研制成功的新型全封闭刀口联合式管口封。海上实验在特定海区成功的获取了17．11m的长岩芯，取样率达91．3％，创造了我国海洋地质调查用重力活塞取样器获取岩心的最长记录。该设计已通过国家知识产权局批准授予实用新型专利。  相似文献