摘要
泥水平衡顶管技术被广泛用于穿越铁路、公路、河流等地下管线工程中,并在我国南水北调工程中发挥重要作用,但在施工中也出现了长距离施工减阻和轨迹精度控制等难题。结合商周高速顶管穿越工程,探讨了顶管机选型、注浆参数、顶进力估算和轨迹纠偏等关键技术。通过对顶力计算值与实测值的对比表明工程采用的润滑泥浆的减阻效果明显,有泥浆润滑时(15m后)的摩阻力约为无润滑时(15m前)的11%,实际的总顶进力约为计算值的9%。利用激光全站仪对掘进机头的轨迹偏差的分析结果表明:机头的水平轨迹偏差很小,且无明显规律;机头的下沉可能会导致轨迹容易向下偏斜。
Slurry balanced pipe jacking has been widely applied in installation of pipelines crossing railways,roads and rivers,and performs significant role in South-to-North Water Diversion Project,whilst it has been constrained by lubrication and alignment control,particularly in comparatively long drives.This paper discusses key technologies including pipe jacking machine selection,slurry injection properties,thrust estimation and trajectory deviation of the tunnel boring machine（TBM）according to Shangzhou Highway pipe-jacking crossing project.The comparison between thrust estimation and field data indicates an apparent reduction in unlubricated friction（before 15m）to 11% after utilizing lubrication mud（after 15m）,and the magnitude of final thrust is approximately 9% of the estimation.By introduction of a laser total station,trajectory deviations of the TBM were subsequently investigated.It is found that horizontal trajectory deviations are narrow and irregular,while the vertical trajectory tend to deflect beneath the designed axis caused by settlement of the boring machine.
出处
《地质科技情报》
CAS
CSCD
北大核心
2016年第2期28-32,共5页
Geological Science and Technology Information
关键词
顶管
泥水平衡
润滑泥浆
顶进力
轨迹偏差
pipe jacking
slurry balance
lubricant slurry
thrust
trajectory deviation
