陕京输气管道复杂地段的设计

Design on complex sections of Shanjing Gas Pipeline

陕京输气管道沿线地质条件复杂,地貌类型多,其中有湿陷性黄土冲沟,中低山地及丘陵、河谷滩地和地震活动断裂带等。介绍了该输气管道线路设计的特点及地质条件复杂的情况下管道敷设施工应注意的问题,指出:应避免管道通过山区的陡坎和半坡,特别是应慎重选择制高点和转角点;根据河床不同的地质情况,采用不同的稳管措施;对于湿陷性黄土区域,管道应尽量选择在湿陷性弱的地带通过;在地震断裂带及其影响区两侧各200 m内增加管沟宽度并减小管道埋深。通过对该线路工程复杂地段设计的实践,提出了建议。

The geological condition over Shanjing Gas Pipeline shows complicated features, with many types of landform, including damping trap loess gully, medium and low mountain land and hilly, valley beach and seismic active fracture belt, etc. The article introduces design features for this pipeline and the problems required to pay attention to in pipeline laying construction under complicated geological conditions, and points out that abrupt slope and half-slope shall be avoided when passing through mountains, especially commanding point and corner point shall be selected carefully. Different pipeline stabilizing method shall be taken in light of different geological conditions of river bed; as for damping trap loess range, the pipeline shall be designed to pass through the area with weak damping trap feature; the width of pipe trench shall be widened in the range of 200mm on both sides of seismic fracture belt and its effective zone and shallow cover shall be laid on the pipeline. The article also puts forward a proposal through design practice for the engineering of the pipeline getting through complicated sections.