大口径三维曲线顶管顶力估算及实测分析

发布时间：2018-04-01 01:15

本文选题：长距离　切入点：大直径　出处：《岩土力学》2015年S1期

【摘要】：顶管顶进阻力由顶管机的迎面阻力和管节与土体间的摩阻力两部分组成,现有的顶力估算公式都具有一定的适用条件,虽然物理意义明确,但参数取值范围较大,往往估算顶力与实际工程顶力的匹配程度较低,尤其是在三维曲线顶管工程中受曲线段的影响,准确估算顶力的难度更大。以长413.0 m,外径为3.8 m,最小曲率半径为313.7 m的三维曲线顶管工程为研究对象,基于现有的顶力公式估算所需顶力大小并布设中继间,在该工程实测数据的基础上分析顶力组成及其与顶程、顶进曲率半径等影响因素之间的关系和顶管在平面曲线和垂直剖面曲线以不同曲率半径顶进的摩阻力变化规律。分析结果显示,曲线顶管摩阻力附加系数是真实存在的,且工程实测值与经验值有所偏差,但顶管在淤泥或黏土层中顶进时的摩阻力按规程推荐取值能够满足工程实践需求。最后提出了顶力估算及中继间的布置建议,为类似工程提供依据。
[Abstract]:The pipe jacking resistance consists of two parts: the head-on resistance of the pipe jacking machine and the friction between the pipe joint and the soil. The existing formulas for estimating the jacking force have certain applicable conditions. Although the physical meaning is clear, the range of parameter values is large.The degree of matching between estimating the jacking force and the actual engineering force is often low, especially in the 3D curve pipe-jacking engineering, it is more difficult to estimate the jacking force accurately because of the influence of the curve section.Taking the 3D curve pipe jacking project with a length of 413.0 m, an outer diameter of 3.8m and a minimum radius of curvature of 313.7 m as the research object, the required top force is estimated and the relay space is arranged based on the existing formulas of the top force.On the basis of the measured data of the project, the relationship between the force composition of the jacking force and the influence factors such as the top path, the radius of the jacking curvature, and the friction resistance of the pipe jacking in plane curve and vertical profile curve with different curvature radii are analyzed.The analysis results show that the additional coefficient of friction resistance of curve jacking pipe is real, and the measured value of engineering is different from that of experience value, but the friction resistance of pipe jacking in silt or clay layer can meet the requirement of engineering practice according to the recommended value of rules.Finally, the paper puts forward the estimation of the top force and the arrangement suggestion between the relays, which provides the basis for the similar projects.
【作者单位】：福建省电力勘测设计院;中国电力科学研究院;国网福建省电力有限公司经济技术研究院;
【基金】：中国电力建设股份有限公司科技项目(No.DJ-ZDXM-2014-28) 福建省电力有限公司科技项目(科2012-066)
【分类号】：TU990.3

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