地埋管线周围土体抗力系数的正交各向异性解析分析

doi:10.13722/j.cnki.jrme.2018.0985

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摘要地埋管线周围土体抗力系数的各向异性及合理取值问题的解决，对于市政或海底管线的设计和评估是至关重要的。考虑管线部分或完全埋置以及管土刚度比的变化，综合运用传递矩阵法和解析类比法得到竖向及水平抗力系数；轴向抗力系数采用剪切位移法(部分埋置)或镜像法(完全埋置)求解。算例验证了抗力系数取值方法的合理性，并针对3种地基分布形式分析了参数变化下抗力系数取值的差异性。结果表明，抗力系数均随着管线埋径比的增大而增大且埋径比达到20后趋于稳定值，竖向及水平抗力系数随着管土刚度比的增大而减小；均质半无限地基中轴向抗力系数小于竖向抗力系数，管线部分埋置时水平与竖向抗力系数的比值小于1，而完全埋置时其值大于1且埋径比达到20后会趋近于1；管线下方土体的有限压缩特性对竖向及水平抗力系数均有明显影响，且竖向更为显著；抗力系数的简化均质解与成层解相差较大，均质解偏大(上软下硬地层)或偏小(上硬下软地层)，分层特性明显时应采用成层解。

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	王雨1
	陈文化1
	王凯旋2

关键词 ：土力学, 地埋管线, 各向同性土体, 弹性抗力系数, 解析解, 正交各向异性

Abstract：For the design and assessment of municipal and submarine pipelines，it is vital to solve the problems of the anisotropy and determination of the soil resistance coefficients around buried pipelines. Vertical and horizontal resistance coefficients were obtained by using transfer matrix method and analogy method，considering partial or complete embedment of the pipeline and change of the pipe-soil stiffness ratio，and axial resistance coefficient was solved by using shear displacement method and image method respectively corresponding to partially buried and completely buried cases. The rationality of the method for calculating the resistance coefficients was verified via numerical examples，and the differences in the values of the resistance coefficients caused by the change of parameters were analyzed for three typical foundation distribution forms. The results show that the resistance coefficients in three directions increase with increasing the buried depth-diameter ratio and tend to be stable with the buried depth-diameter ratio reaching 20，and that the vertical and horizontal resistance coefficients decrease with rising the pipe-soil stiffness ratio. In homogeneous semi-infinite soil，the axial resistance coefficient is less than the vertical resistance coefficient. The ratio of the horizontal resistance coefficient to the vertical resistance coefficient is less than 1 for the partially buried pipeline，but，for the completely buried pipeline，more than 1 and approaches 1 with a buried depth-diameter ratio of 20. The finite compression characteristic of soil under the pipeline has obvious influence on the vertical and horizontal resistance coefficients，and the influence on the former is more significance. The vertical and horizontal resistance coefficients obtained by simplified homogenization method are obviously different from the stratified solutions proposed in this paper. Corresponding to the cases of an upper-soft and lower-hard stratum and an upper-hard and lower-soft stratum，the simplified homogeneous values of the resistance coefficients are respectively bigger or smaller than the stratified solutions.

Key words： soil mechanics buried pipeline isotropic soil elastic resistance coefficients analytic solutions orthogonal anisotropy

引用本文:

王雨1，陈文化1，王凯旋2 . 地埋管线周围土体抗力系数的正交各向异性解析分析[J]. 岩石力学与工程学报, 2019, 38(3): 606-618.
WANG Yu1，CHEN Wenhua1，WANG Kaixuan2. An analytical method for evaluating orthogonal anisotropy of soil resistance coefficients around buried pipelines. , 2019, 38(3): 606-618.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0985 或 http://www.rockmech.org/CN/Y2019/V38/I3/606

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