Abstract
Buried pipelines influenced by coal mining subsidence will deform and generate additional stress during surface deformation. On the basis of the coordinating deformation relationship between buried pipeline and its surrounding soils, a stress analysis method of a buried pipeline induced by mining was proposed. The buried pipeline additional stresses were analyzed; meanwhile, a corresponding analysis process of the pipeline stresses was also presented during mining subsidence. Furthermore, based on the ground subsidence along the pipeline predicted in advance by the probability integral method, the additional stresses and Von Mises equivalent stresses and their distributions along the buried pipeline induced by the exploitation of a coal mining working face named 14101 were obtained. Meanwhile, a comparative analysis of additional stresses between simulation and analytical calculation was performed for the deep analysis and reliability of the results presented by the proposed methodology in this paper. The proposed method provides references for analysis of the additional stress and safety of buried pipelines under the influence of mining subsidence.
Highlights
Extending large-scale surface subsidence induced by underground coal mining has appeared in coal mining areas.erefore, buried pipelines are prone to deformations seemingly keeping far away from the mining goafs [1, 2]. e most significant problems to buried pipelines near coal mining are the additional stress and safety induced by coal exploitation during mining subsidence
It is well known that the additional stresses and deformations of a buried pipeline are induced by the constraining force from surrounding soil mass during surface subsidence. erefore, additional stress analysis of a buried pipeline affected by mining subsidence should take the relationship of pipe-soil coordinating deformation into account firstly
As a matter of fact, the surface deformations along a pipeline could be predicted in advance through the probability integral method, if subsidence prediction parameters of a mine are given [3,4,5]. is paper tries to start with the analysis of the relationship of pipe-soil coordinating deformation and combines the surface deformation along the buried pipeline and subsidence prediction parameters to present an available additional stress analysis method of buried pipeline affected by mining subsidence
Summary
Extending large-scale surface subsidence induced by underground coal mining has appeared in coal mining areas. Erefore, it is very important to present a practicable methodology to evaluate the additional stress and safety of buried pipelines under the influence of mining subsidence. Erefore, additional stress analysis of a buried pipeline affected by mining subsidence should take the relationship of pipe-soil coordinating deformation into account firstly. Is paper tries to start with the analysis of the relationship of pipe-soil coordinating deformation and combines the surface deformation along the buried pipeline and subsidence prediction parameters to present an available additional stress analysis method of buried pipeline affected by mining subsidence. A corresponding analysis process is proposed by combining the surface deformation along the buried pipeline which could be obtained in advance by the given prediction parameters of mining subsidence. E proposed method provides references for analysis of the additional stress and safety of buried pipelines under the influence of mining subsidence.
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