岩石地层中顶管顶力计算方法研究  

Research on jacking force of pipe jacking in rock stratum

作　　者：赵文彬 阮仁酉 严克伍 申永江[1] ZHAO Wenbin;RUAN Renyou;YAN Kewu;SHENG Yongjiang(School of Civil Engineering,Central South University,Changsha 410075,China;Nuclear Industry Shaft Construction Group Co.Ltd.,Huzhou 313001,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]核工业井巷建设集团有限公司,浙江湖州313001

出　　处：《中南大学学报（自然科学版）》2023年第3期1023-1032,共10页Journal of Central South University:Science and Technology

基　　金：湖南省自然科学基金资助项目(2020JJ4723);中南大学中央高校基本科研业务专项资金资助项目(2021zzts0773)。

摘　　要：顶管施工常见于市政地下管线建设工程,相应的顶力计算模型已经发展成熟并成功运用于实际工程,然而,目前国内外对岩石地层中的顶力计算研究较少,为此,针对福建平潭引水工程中某曲线顶管穿越硬质岩层,考虑掘进后隧洞的稳定性,分别从管岩接触与管浆接触这2种接触方式计算管侧摩阻力,同时采用Hertz与Persson这2种弹性接触理论推导施工状态下钢管与岩层之间的接触角度。此外,考虑管节中轴线以下与沉渣带发生局部接触,在顶进过程中沉渣带分布沿管线呈概率分布,提出一种适用于此类接触条件下的顶力计算模型。研究结果表明:在理想状态下,钢管在顶进过程中与周围岩层之间接触角度在0.57°~1.15°范围内,可认为管岩之间处于点或线接触状态;与沉渣带接触时,当沉渣带分布沿管线占比为0.5~1.0时,实测顶力曲线基本被包络在管渣接触曲线的上下限之间,证明所提出顶力计算模型是有效的,可为相关工程研究提供参考。Pipe jacking construction is commonly used in municipal underground pipeline construction projects,and the corresponding calculation model of jacking force is developed and successfully used in actual projects.but little research was reported at home and abroad on the calculation method of jacking force in rock formations.For a curved pipe jacking through hard rock stratum in Fujian Pingtan water diversion project,considering the stability of the tunnel after tunneling,the frictional resistance of the pipeline was calculated from pipe rock contact and pipe slurry contact,respectively,and meanwhile,two elastic contact theories of Hertz and Persson were used to deduce the contact angle between steel pipe and rock stratum under construction condition.In addition,considering the partial contact state between the lower part of the pipe and the sinker zone,which was probabilistically distributed along the line,a jacking force calculation model was proposed for such contact conditions.The results show that under ideal condition,the contact angle between the steel pipe and the surrounding rock in the jacking process is from 0.57°to 1.15°,which can be considered as point or line contact state between the pipe and the rock.Considering the sediment belt,the measured jacking force curve is basically enveloped between the upper and lower limits of the pipe slag contact when the proportion of the slag belt distribution along the line is from 0.5 to 1.0,which proves the validity of the proposed jacking force calculation model and provides reference for the subsequent related projects.

关 键 词：岩层 钢管 弹性接触 沉渣带 顶力 

分 类 号：TU432[建筑科学—岩土工程]