摘要
水平定向钻进非开挖铺管的回拖阻力异常增大往往是钻孔缩径抱管所造成。分析了影响缩径抱管应力的因素:主要是孔内泥浆压力与地应力之差、土层的弹性模量、蠕变性、时间和泥浆失水量;籍此建立了"零失水"状况下计算抱管应力的经验公式,并对泥浆失水造成的影响做了探讨;从综合控制孔内泥浆压力、采用强降失水泥浆体系、紧凑施工作业时间、提高泥浆的润滑性等方面提出了降低抱管阻力的措施。
The paper analyzed the factors affecting stress of pipe-holding by diameter-reducing. They were mainly the difference between pressure of in-hole drilling mud and geostress, elastic modulus of soil layer, creepage, time and slurry filtrating amount. Experience formula was established to calculate the plpe-holding stress under ＇ zero filtrate＇ , and countermeasures were put forward to reduce the pipe-holding resistance.
出处
《探矿工程（岩土钻掘工程）》
2008年第2期63-65,共3页
Exploration Engineering:Rock & Soil Drilling and Tunneling
关键词
非开挖
钻孔
地应力
缩径
抱管
降失水泥浆
润滑性
trenchless
borehole
geostress
diameter-reducing
pipe-holding
filtrate-reducing slurry
lubricity
