“武汉市地下管线信息系统”的建设   总被引：6，自引：0，他引：6  

李黎  李剑 《测绘信息与工程》2004,29(2):15-16

结合武汉市地下管线信息系统的建设,分析了地下管线信息系统建设的目标,阐述了总体结构、系统功能、数据结构和系统特点.  相似文献   

Application of ground‐penetrating radar to the identification of subsurface piping in blanket peat     

J. Holden  T. P. Burt  M. Vilas 《地球表面变化过程与地形》2002,27(3):235-249

Natural soil pipes are common and significant in upland blanket peat catchments yet there are major problems in finding and defining the subsurface pipe networks. This is particularly important because pipeflow can contribute a large proportion of runoff to the river systems in these upland environments and may significantly influence catchment sediment and solute yields. Traditional methods such as digging soil pits are destructive and time‐consuming (particularly in deep peat) and only provide single point sources of information. This paper presents results from an experiment to assess the use of ground‐penetrating radar (GPR) to remotely sense pipes in blanket peat. The technique is shown to be successful in identifying most of the pipes tested in the pilot catchment. Comparison of data on pipes identified by GPR and verified by manual measurement suggests that pipes can be located in the soil profile with a depth accuracy of 20 to 30 cm. GPR‐identified pipes were found throughout the soil profile; however, those within 10–20 cm of the surface could not be identified using the 100 or 200 MHz antennae due to multiple surface reflections. Generally pipes smaller than 10 cm in diameter could not be identified using the technique although modifications are suggested that will allow enhanced resolution. Future work would benefit from the development of dual‐frequency antennae that will allow the combination of high‐resolution data with the depth of penetration required in a wetland environment. The GPR experiment shows that pipe network densities were much greater than could be detected from surface observation alone. Thus, GPR provides a non‐destructive, fast technique which can produce continuous profiles of peat depth and indicate pipe locations across survey transects. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

A simplified analysis model for determining the seismic response of buried steel pipes at strike-slip fault crossings     

《Soil Dynamics and Earthquake Engineering》2015

The seismic response analysis of buried pipelines at fault crossings is a complex problem requiring nonlinear 3D soil-structure and large deformation analyses. Such analyses are computationally expensive and the results are hard to evaluate. Therefore, a simple numerical model is needed for engineering and design offices to determine the seismic demand of steel pipes at fault crossings. This paper presents a simplified numerical model for buried steel pipes crossing strike-slip faults and oriented perpendicular to the fault. Two pipes with different diameter to thickness (D/t) ratios and steel grades are used in the study. The proposed model permits plastic hinge formations in the pipe due to incrementally applied fault movements, allows determination of the critical length of the pipeline and measure strains developed on the tension and compression sides in the pipe. The model also considers the effect of bending as well as axial strains due to stretching.  相似文献   

Artificial earthquake test of gas supply networks     

《Soil Dynamics and Earthquake Engineering》2016

In this paper, seismic behavior of gas supply networks is investigated by constructing a 24 m×24 m buried network and conducting an artificial earthquake test by detonating TNT explosives. The pipe network consists of typical welded steel pipes used in gas supply networks. Ground motion is produced by detonating 30 kg of TNT explosives buried 5 m below ground surface and 15 m away from the network. The test preparations are presented, including site selection, network layout, ground motion generation, and arrangements of different sensors. The measured ground acceleration, strain, and acceleration of welded steel pipes, and pipe–soil relative slippage are discussed. The deformation patterns of welded steel pipes are also analyzed and explained, including axial and bending deformations, systematic network characteristics, deformation relationship between ground and pipes, and dynamic response of buried pipes.  相似文献   

定向钻铺管回拖力计算模型     

呼石磊  鄢泰宁  王斌  刘昊 《煤田地质与勘探》2012,40(3):66-69,73

在定向钻穿越铺管的过程中,管道在孔内的受力情况非常复杂,但是回拖力计算又是机具选择的重要参考依据,所以管道受力分析及回拖力计算就显得非常重要。通过分析管道在弯曲段和稳定段的受力情况,分别建立管道弯曲段和稳定段的受力模型,最终总结出计算管道回拖力的方法。经实例计算检验,这种计算方法更加接近实际。   相似文献   

地下管线弹性波探测波场的建模与分析     

徐慧峰  钱彦岭  邱静  谢迪波 《岩土力学》2010,31(5):1651-1656

在地下管线弹性波探测中,由位于地下圆孔边界上有限时长的力源激发形成瞬态场,应用波函数展开法对此波场进行建模。以波函数和待定系数组成的级数序列描述探测波场中的势函数,根据界面处应力和位移连续的边界条件求解待定系数,从而得到波场中弹性波的解析解。据此进行数值研究,分析探测波场中弹性波的传播特征,说明了散射波的类型以及能量对比关系,并总结了反射信号幅值与地下管线物理参数之间由声阻抗匹配程度支配的反射信号强度变化规律,而管线半径对反射信号强度的影响要大于物理参数的作用。最后以实验结果验证上述结论。  相似文献   

Modelling pipeflow contributions to stream runoff     

J. A. A. Jones 《水文研究》1988,2(1):1-17

Runoff from natural soil pipes has been shown to be a significant contributor to stream discharge in parts of upland Wales. Attempts have been made to model pipeflow contributions using both theoretical and empirical approaches, but little progress has yet been made towards producing generally applicable models of complete pipeflow systems. The paper identifies some of the problems of devising general models with reference to data from the Maesnant Experimental Catchment. The data suggest that in-pipe travel times are more important here than inferred elsewhere, and that neither simple hydraulic models nor kinematic wave theory can adequately explain the patterns of response. In particular, stormflow tends to begin first at the network outfall and even peak discharge often occurs at the outfalls before the headward zones.  相似文献   

鄂北工区钻杆WC耐磨环的耐磨材料及敷焊工艺分析          下载免费PDF全文

荣士卫  卜有伟  刘杰 《探矿工程》2005,32(11):37-40

鄂北工区钻杆耐磨环失效现象很普遍，造成钻杆耐磨环失效的主要原因有地层研磨性、钻杆的井下工况、耐磨材料选择与敷焊工艺的影响。选择合理的耐磨材料与敷焊工艺对解决鄂北工区钻杆偏磨耐磨环失效问题非常重要。  相似文献   

基于三维技术的地下管线数据智能化质检系统设计与实现     

朱学明  曹峰  宋志勇 《江苏测绘》2014,(3):12-14

通过分析地下管线数据常见质量问题,结合三维虚拟仿真技术,提出了一种智能化的质检方法。本文主要阐述了数字管线三维质检系统的建设方案、架构设计、功能设计等内容,并介绍了系统实现后的各项功能。  相似文献