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首页> 外文会议>International pipeline conference >PIPELINE ROUTE ASSESSMENT AT RIVER CROSSINGS AND IN STEEP TERRAIN: GEOPHYSICAL, HYDROLOGIC AND GEOTECHNICAL CHARACTERIZATION
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PIPELINE ROUTE ASSESSMENT AT RIVER CROSSINGS AND IN STEEP TERRAIN: GEOPHYSICAL, HYDROLOGIC AND GEOTECHNICAL CHARACTERIZATION

机译：河流交叉口和陡峭地形的管道路线评估：地球物理，水文和岩土性表征

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Pipeline river crossings and sections of pipeline routes where steep terrain requires directionally drilled borings have the highest chance of being successfully designed and constructed if subsurface geological conditions are understood. In this paper we present results of geophysical surveys conducted to characterize the subsurface at two pipeline river crossings and at a site where steep topography would likely require directional boring below the face of a steep hillside. The objective is to help assess and minimize the risk in engineering design in difficult terrain by analyzing subsurface geology from geophysical data and vertical geotechnical borings, and evaluating the dynamic behavior of the river itself through hydrologic analysis. Risk factors can be assigned on the basis of lithology and environmental considerations relating to the level of potential impact in different parts of the crossing. The laterally heterogeneous nature of river channels, consisting of stacked paleochannels and floodplains could require a significant number of vertical geotechnical borings for adequate characterization of the entire crossing. We find that a combination of electrical resistivity tomography (ERT), seismic refraction tomography (SRT) and ground penetrating radar (GPR) data can efficiently provide us with an understanding of electrical and mechanical properties from which lateral variations and depth extent of lithology along the proposed boring can be inferred. Confirmatory vertical geotechnical borings allow us to verify our interpretation at two locations. Geophysical data are used to laterally extrapolate the lithologic interpretation and define, in conjunction with surface water hydrologic considerations, the minimum depth of directionally drilled borings and optimum locations of ingress/egress points. The investment in a geological assessment study to understand subsurface conditions prior to beginning horizontal boring operations is essential to mitigate risk and ultimately may save money. In the case of steep terrain, geophysical data can provide valuable information on the vertical and lateral variations in subsurface properties in areas where it would be impossible to safely drill vertical borings. Our last case history is an example of the geological information that can be efficiently inferred from geophysical surveys conducted in steep terrain.
机译：管道河流交叉口和管道路线的部分，其中陡峭地形需要定向钻出的钻石的机会最高的机会，如果地下地的地质条件理解。在本文中，我们目前在两个管道河流交叉口和陡峭地形可能在陡峭的山坡面前方向钻孔的位置来表征地球物理调查的结果。目的是通过分析来自地球物理数据和垂直岩土钢管的地下地质，通过水文分析评估河流本身的动态行为来帮助评估和最小化困难地形中工程设计的风险。危险因素可以基于与交叉不同部分潜在影响的潜在影响有关的岩性和环境考虑因素。河流渠道的横向异质性质，由堆叠的古草和洪泛区组成，可能需要大量的垂直岩土硼，以便对整个交叉的表征充分表征。我们发现电阻率断层摄影（ERT），地震折射断层扫描（SRT）和地面穿透雷达（GPR）数据的组合可以有效地为我们提供了理解电气和机械性能，从中横向变化和岩石学的深度范围建议的镗孔可以推断出来。确认的垂直岩土工业挖掘允许我们验证我们在两个地点的解释。地球物理数据用于横向推断岩性解释和定义，与地表水文学考虑，定向钻孔的最小深度以及入口/出口点的最佳位置。对地质评估研究的投资来了解横向无聊行动前的地下条件对于减轻风险至关重要，最终可能会省钱。在陡峭地形的情况下，地球物理数据可以提供有关在区域中不可能安全钻垂直钻孔的区域中的垂直和横向变化的有价值的信息。我们的最后一个案例历史是从陡峭地形中进行的地球物理调查可以有效推断的地质信息的示例。

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