土工格栅防护埋地HDPE管道的变形与力学性能

发布时间：2018-01-12 22:32

本文关键词：土工格栅防护埋地HDPE管道的变形与力学性能　出处：《西南交通大学学报》2017年01期 　论文类型：期刊论文

【摘要】：为了深入分析土工格栅加筋防护对埋地管道的减载性能,采用埋地管道上方地表加载板静载试验,综合对比研究了筋材首层埋深、铺设长度与层数及管周土性质和管道埋深等因素对管道变形和力学性能的影响.研究结果表明:当筋材长度由0增至4D(D为管道外径)、管周土密实度由45%增至75%、加筋层数由0增至3~4层时,管道上方加载板极限承载力相应地分别增加1.40倍、1.60倍和2.52倍;管道以环向应变为主,应变范围在-1.0%~0.5%之间;相同条件下管道垂直径向变形大于水平径向变形,且当筋材首层埋深为0.4B(B为加载板宽)、筋材长度为4D和筋材层数为3~4时,土工格栅加筋减载防护性能最佳.
[Abstract]:In order to deeply analyze the load reduction performance of buried pipeline by geogrid reinforced protection, the static load test of the surface loading slab above the buried pipeline is adopted, and the burying depth of the first layer of the steel bar is compared and studied synthetically. The influence of laying length, layer number, pipe surrounding soil properties and pipe buried depth on the deformation and mechanical properties of the pipe is studied. The results show that when the length of steel bar is increased from 0 to 4D, the diameter of the pipe is increased. When the compactness of surrounding soil increases from 45% to 75 and the number of reinforced layers increases from 0 to 3 layers, the ultimate bearing capacity of the loading plate above the pipe increases by 1.40 times to 1.60 times and 2.52 times respectively. The main strain of the pipeline is circumferential strain, the strain range is between -1.0% and 0.5%. Under the same condition, the vertical radial deformation is larger than the horizontal radial deformation, and when the depth of the first layer of the steel bar is 0.4B, the length of the steel bar is 4D and the number of the reinforcement layers is 3 ~ 4:00. Geogrid reinforced and load-reducing protection performance is the best.
【作者单位】：河北工业大学土木与交通学院;河北工业大学河北省土木工程技术研究中心;
【基金】：河北省自然基金资助项目(E2014202038)
【分类号】：TE973.1
【正文快照】： 300401)截止到2010年,中国现有高压油气输送管道总长达8.5万多千米,预计到2020年,中国长距离油气管道建设里程将达到10~15万千米[1-3].当前许多既有和新建油气管道面临着巨大的安全隐患,这些管道除了承受覆土自重外,还常承受道路交通荷载和附近的第三方施工荷载,尤其是浅埋的

【相似文献】