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在分析西气东输天然气管道二线DD245-DD246标段地质、地形及采矿方法的基础上,计算分析了受采动影响大孔湿陷性黄土沟壑地形产生的次生地质灾害及其危害程度。应用概率积分模型引入黄土沟壑地形附加移动变形函数预计了煤矿开采引起的地表移动变形,分析评价了开采沉陷对地表天然气管道的影响程度。通过相应的评价指标给出研究区域的危险性等级,根据危险性等级采取了相应的安全处治措施。
Based on the analysis of the geology, topography and mining methods of the DD245-DD246 second-stage natural gas pipeline in West-to-East Gas Pipeline Project, the secondary geological disasters and their damage caused by the mining of macroporosity collapsible loess gully were calculated and analyzed. The probabilistic integral model was used to predict the surface deformation induced by coal mining with the additional motion and deformation function of loess gully topography. The influence of mining subsidence on the surface natural gas pipeline was analyzed and evaluated. Through the corresponding evaluation index, the risk grade of the study area is given, and the corresponding safety measures are taken according to the grade of danger.