摘要
埋地管道是油气输送的重要组成部分,煤矿采空区地表沉降会造成经过采空区的管道相应沉降,造成管道变形、断裂等事故。以蒲县—河津管线穿越采煤沉陷区为研究背景,运用3D打印技术弥补了管道模拟材料与岩土模拟材料在力学相似上的不匹配性,构建管道与岩土的耦合相似模拟实验,分析了埋地管道因煤矿开采所导致的采动响应,建立了管道移动变形与地层移动变形的相关关系。研究表明:埋地管道与下伏岩层不同步沉降,使其上覆岩层和下伏岩层间出现脱层,管道在上覆岩层荷载及其自重作用下发生弯曲变形,当脱层跨度足够大时,导致管道底部所受到的弯曲拉应力超过其许用应力,发生拉伸破坏;埋地管道下沉值约为地层下沉值的1.21倍,地层水平变形只有约18%传导至管道。研究成果对沉陷区管道安全铺设和日常维护具有指导意义。
Buried pipeline is an important part of oil and gas transportation.The subsidence of gob area will cause the corresponding subsidence of the pipeline passing through the gob area,resulting in pipeline deformation,fracture and other accidents.Taking Puxian-Hejin pipeline crossing coal mining subsidence area as the research background,3D printing technology was used to make up for the mismatch in mechanical similarity between pipeline simulation materials and geotechnical simulation materials,and the coupling simulation experiment between pipeline and rock and soil was constructed.The mining response of buried pipeline caused by coal mining was analyzed,and the correlation between pipeline movement deformation and stratum movement deformation was established.The research shows that the buried pipeline and the underlying rock strata do not synchronously settlement,resulting in delamination between the overlying rock strata and the underlying rock strata.The pipeline bends and deforms under the overlying rock load and its own weight.When the delamination span is large enough,the bending tensile stress on the bottom of the pipeline exceeds the allowable stress,resulting in tensile failure.The subsidence value of the buried pipeline is about 1.21 times of the formation subsidence value,and only 18%of the horizontal deformation of the formation is transmitted to the pipeline.The research results have guiding significance for the safe laying and daily maintenance of pipelines in subsidence area.
作者
易四海
石文校
蔡音飞
陈文聪
朱伟
YI Si-hai;SHI Wen-xiao;CAI Yin-fei;CHEN Wen-cong;ZHU Wei(School of Safety Engineering,North China University of Science and Technology,Langfang 065201,China;School of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Tianjin Branch of China Coal Science&Industry Eco-Environmental Technology Co.,Ltd.,Tianjin 300000,China)
出处
《科学技术与工程》
北大核心
2025年第13期5394-5399,共6页
Science Technology and Engineering
基金
国家自然科学基金面上项目(52274165)
山西省自然科学基金(2016012002)。
关键词
埋地管道
沉陷区
采动变形
相似模拟
buried pipeline
subsidence area
mining deformation
analog simulation
作者简介
第一作者:易四海(1980-),男,汉族,湖北公安人,博士,研究员,硕士研究生导师。研究方向:开采沉陷与“三下”采煤技术。E-mail:tsyisihai@163.com。
