黄土湿陷区长输管道暗悬长度探析

LOESS DISTRICT PIPELINE PROBE INTO THE DARK OVERHANG LENGTH

统计分析研究区2014、2015年度管道地质灾害调查结果,得到黄土湿陷最为发育,占灾害总量的58%。黄土湿陷形成的碟形地、裂缝、落水洞、陷穴、暗穴等轻则造成管区填土不均匀沉降或局部塌陷,重则导致管道出露或暗悬。长距离暗悬管道,在自身重力和外加荷载作用下,可能发生弯曲变形、甚至断裂,严重威胁管道运营安全。本次研究依据实际情况构建管道暗悬受力模型,合理选取模型参数,计算得到在强度和挠度条件下暗悬管道的极限跨度依次为15.41m、14.69m,并确定管道的安全跨度9.54m,为管道的应急抢险和安全运营提供依据,为管道黄土湿陷灾害防治提供技术保障。

Statistical analysis of the study area in 2014 and 2015 geological disaster survey results get most loess collapsibility and development,accounting for 58% of the total disas-ter.Formation of loess collapsibility dish,cracks,water cave,sinkhole,hidden caves and other light caused district fill uneven settlement or partial collapse,to lead out or dark over-hang.Long dark suspended pipeline,under its own gravity and imposed loads,you may bend or even break,serious threat to the safety of pipeline operation.This study based on the actual build pipeline dark force suspension model,choosing the model parameters ob-tained in intensity and dark of suspended pipeline under the condition of deflection limit span followed by 15.41 m,14.69 m,and to determine the safety of pipeline span of 9.54 m,pro-vide the basis for emergency rescue and security operations of the pipeline,pipeline loess subsidence disaster and provide technical support.