非开挖管线精细探测方法分析     

黄鹏飞 《测绘通报》2021,(5):140-144

地下管线精细探测为在常规地下管线探测的基础上,针对工程建设中的重点区域、重点管线、疑难管线、特殊管线采用专门的仪器和方法,通过高质量、高密度或高精度的探测,为设计、施工提供更准确更详细的地下管线现状成果。其中非开挖管线的精细探测是重中之重且一直是业内难题。文中通过应用实例,验证了里奇SR-20结合微型示踪探头以及结合惯性陀螺仪定位技术在非开挖管线精细探测中的精确性和可靠性,根据场地条件和管线深度在这两种方法中进行选择,实现对非开挖管线的精细探测。  相似文献   

排水管线点和道路曲率协同下的道路表面模型获取     

毛涛敏  范业稳  职爽  张煜辉 《测绘通报》2021,(7):144-149

由于数据保密管理及共享机制不完善,城市水务部门用于降雨径流模拟的道路地形数据精度低,模拟精准度不高,进而降低了对城市内涝空间分布准确性的预判和防御。而城市水务部门因业务需要获取的排水管线及管线点数据,不仅反映了排水管线与城市道路的关系,而且管线点数据中的高程信息也反映了道路的起伏态势。据此本文首先基于排水管线点的高程信息,以及协同管线点所在道路的边线曲率所反映的道路横断面特征,通过模型内插获取道路表面特征点;然后根据管线点和内插特征点获取道路表面模型;最后利用武汉市实际道路上的排水管线点和道路边线数据验证该方法的可行性。  相似文献   

ONSET数据流水线     

王新华  陈东  邓涛  代红兵  向永源 《天文研究与技术》2022,(1)

随着天文大科学设备的投入使用,传统的开发模式面临程序重复开发,环境依赖冲突等问题。另外,集群是一个高度耦合的计算资源,严重的环境冲突可能导致整个集群不可用。为了解决这个问题,采用微服务的概念开发新的流水线框架,这种框架可以实现短期内开发和部署新的流水线。介绍了通过这种框架开发的ONSET数据流水线,为了实现准实时数据处理,采用MPI和GPU技术对核心程序做了优化,并对最后的性能做了评估。结果表明,这种开发模式可以在短期内搭建满足需求的流水线,这种开发模式对未来多波段多终端的天文数据处理有借鉴意义。  相似文献   

城市地下管线三维建模关键技术研究   总被引：4，自引：0，他引：4  

卢丹丹  谭仁春  郭明武  李鹏鹏 《测绘通报》2017,(5):117

随着城市地下管线信息化管理、表达和应用从二维向三维延伸,本文结合武汉市地下管线三维模型建设工作,在开展了大量研究与实践的基础上,针对地下管线三维建模的高精度自动化、局部更新快速化和地上地下一体化等关键技术提出了一些新的方法与思路,为国内其他城市开展类似工作提供了参考。  相似文献   

新形势下城市地下管线信息化的特点及对策     

何江龙  江贻芳  侯至群 《测绘通报》2017,(1):12-17

城市地下管线是城市基础设施的重要组成部分。推进城市地下管线普查,提高管线管理信息化、科学化水平是城市稳定发展的必然要求。本文在总结我国地下管线信息化现状的基础上,结合《国务院办公厅关于加强城市地下管线建设管理的指导意见》相关要求,就各个城市在新形势下如何开展城市地下管线信息化提出了思路,并针对管线信息化过程中的难点提出了对策。  相似文献   

Upheaval buckling of surface-laid offshore pipeline     

《Applied Ocean Research》2017

Offshore pipelines operating under high pressure and temperature are subjected to upheaval buckling. Pipeline behaviour in upheaval buckling depends on a number of factors including the shape of pipeline imperfection, installation stresses, loading types, seabed sediment behaviour and the flexural stiffness of the pipe. Current method of predicting upheaval buckling is based on simplified shapes of pipeline imperfection developed for idealized seabed conditions. To account for the effect of internal pressure, the pressure load is represented using an equivalent temperature. However, the applicability of these idealizations on the prediction of upheaval buckling has not been well-investigated. In this paper, the three-dimensional finite element modelling technique is used to investigate the applicability of idealized shapes and their effects on the upheaval buckling of pipeline for a seabed condition at offshore Newfoundland in Canada. The finite element model is then used to conduct a parametric study to investigate the effects of installation stress, loading types, seabed parameters and the flexural stiffness of the pipe. Finally, a design chart is developed to determine the optimum height of seabed features to manage pipeline stability against upheaval buckling under different temperature and pressure loadings.  相似文献   

Experimental prediction of the noncontact jet Trencher’s excavation depth in clay     

Shusen Zhang  Chun Wang  Tong Ge 《Marine Georesources & Geotechnology》2017,35(2):300-304

Trenching depth calculation of traveling jet is a very important field in both pipeline burying and dredging engineering. The trenching ability of a noncontact control flow jet trencher was predicted by experimental method according to the geometry similarity. In the test, the jet pressure, the shear strength of clay, and the translational speed of nozzle were the same with the design parameters, while the nozzle was a reduced scale model. The trenching depth was found about seven to nine times of the nozzle’s diameter. The width of the trench was about four times of the nozzle’s diameter. Based on the test results the noncontact jet trencher was produced and succeeded in practical usage.  相似文献   

非线性波浪作用下埋置管道上波浪力简化计算     

付长静  李国英  赵天龙 《海洋工程》2017,35(3):99-104

由于浅水区波浪的非线性影响显著,浅埋管道受非线性波浪荷载的影响大,为了保证管道长期运行的稳定性,在管道设计过程中需要充分考虑由非线性波浪引起的波浪力。考虑孔隙水和海床土的压缩性,基于Biot固结理论和一阶近似椭圆余弦波理论,利用分离变量法推导了非线性波浪作用下浅水区埋置管道周围海床的渗流压力,进而给出了埋置管道上的波浪力压力解析解,并与已有的文献结果进行比较。计算结果表明,在椭圆余弦波的作用下,海底管道周围海床内的渗流压力呈正弦分布,且管道所受的波浪力随着管径的增大而增大。  相似文献   

液化土中输流管道的竖向地震响应研究     

包日东  闻邦椿 《地震工程与工程振动》2008,28(4)

砂土液化是埋地管道遭受地震破坏的主要原因之一。液化土对管道产生上浮力,使管道发生上浮反应,它是随地震发生时间而变化的动态过程。将地震载荷作用下的液化区埋土管道模拟成两端弹性支承的直梁模型,考虑管-土间的相互作用和管内流体与管道之间的流固耦合作用,采用模态叠加法对液化区埋地管道进行地震响应的动态分析,探讨了管道和液化土参数对管道动态上浮反应的影响。通过数值仿真得到了管内流体的流速、流体压力、流体密度、管截面轴向力,管道黏弹系数、液化土容重和相对弹簧系数、地震加速度幅值等因素对管道上浮位移的影响情况。  相似文献   

Seismic response evaluation of the impact of corrosion on buried pipelines based on the Markov process     

Wei Liu  Jie Li 《地震工程与工程振动(英文版)》2008,7(3):295-303

Water distribution and gas supply systems are among the infrastructure systems that have many buried steel pipelines. Corrosion gradually appears inside and outside of the pipe walls over the service life of these pipelines, the corrosion is primarily caused by the surrounding soil and the materials that flow through the pipelines. However, due to the uncertainty of the characteristics of the soil and materials, the size of the corrosion region is a stochastic variable. In this paper, using a homogeneous Markov process, a model is presented to simulate the occurrence of corrosion. Then, in combinations with a linear corrosion development model, the probability density function of the pipeline area corrosion percentage is derived. Based on the corrosion model, the pipeline seismic displacements and stresses are predicted. Furthermore, using the random perturbation approach, the mean and variance of the pipeline seismic response are given. To illustrate the validity of the proposed approach, a 200-meter long pipeline is numerically investigated and its random seismic response is obtained.  相似文献