摘要
文章推导了一种埋地管线安全程度判定方法的计算公式,分析了适用于超大直径盾构隧道穿越管线过程中的安全判定方法,并建立了管线应力状态与管线位置处的地表变形之间的联系。通过实测地表沉降数据,拟合管线挠曲线方程,再通过对挠曲线求微分得出管线曲率,进而求得管线的应力状态。并通过管线的实际应力状态与容许应力相比较,建立管线安全度评价指标。该安全度指标可以用于指导盾构隧道穿越管线施工中的参数控制。以上海某超大直径越江盾构隧道950-1040环穿越高危管线的实测数据为依据,计算了盾构穿越管线过程中的管线安全度。研究表明,盾构穿越管线会造成隧道上方管线安全度的降低,受影响管线安全系数一般在5-15左右,但通过对盾构施工参数的控制,可以确保高危管线安全。
In this paper,a computation formula is deduced that can be used to judge the safety status of a hazardous buried pipeline when a super-large diameter shield is crossing under it.The relationship between the pipeline′s stress status and the ground deformation above the pipeline is established.Using the measured ground settlement data,the equation for a deflection curve of the buried pipeline is fitted.The stress status of the pipeline is then deduced from the curvature functions,which can be established using a differential calculation for the deflection curve.Finally,the pipeline safety factor is determined by comparing the actual stress to the allowable stress,and this factor can be used as a reference parameter for shield construction.Using an example of large-diameter shield construction from Shanghai,and based on measured data from rings 950 to 1040,the safety factor for pipelines is calculated.The results show that the safety factor varied from 5-15,resulting in a reduction of the pipeline safety.Controlling the shield construction parameters could ensure the pipeline＇s safety.
出处
《现代隧道技术》
EI
北大核心
2014年第5期134-138,共5页
Modern Tunnelling Technology
关键词
超大直径盾构
穿越管线
安全度判定
地表沉降
实测研究
Extra-large diameter shield
Pipeline
Safety judgment
Ground settlement
Field monitoning
