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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 The survey results of pipeline geological disasters in 2014 and 2015 in the study area show that the loess collapses most obviously, accounting for 58% of the total. Loess formed by the collapse of the dished, cracks, sink holes, pits, dark spots and other light pipe filling caused by uneven subsidence or partial collapse, heavy leads to pipe exposed or dangling. Under the action of gravity and applied load, the long-distance dark-suspended pipelines may bend or even break, which may seriously threaten the operation safety of the pipelines. According to the actual situation, this study constructs the model of pipe suspended load and selects the model parameters rationally. The ultimate span of the suspended pipe under the condition of strength and deflection is 15.41m and 14.69m, and the safety span of the pipe is 9.54m. Provide the basis for emergency rescue and safe operation of pipelines, and provide technical support for prevention and treatment of pipeline loessial collapse disasters.