微型桩在山区油气管道防护中的变形机制模型试验研究  

Model test research on the deformation mechanism of micro piles in theprotection of oil and gas pipelines in mountainous areas

作　　者：沈茂丁 孟建[2] 崔少东 SHEN Maoding;MENG Jian;CUI Shaodong(School of Intelligent Science,National University of Defense Technology,Changsha 410073,China;China Petroleum Pipeline Engineering Co.,Ltd.,Langfang 065000,China)

机构地区：[1]国防科技大学智能科学学院,湖南长沙410073 [2]中国石油天然气管道工程有限公司,河北廊坊065000

出　　处：《自然灾害学报》2023年第6期208-219,共12页Journal of Natural Disasters

基　　金：国家管网集团西南管道有限责任公司科技研发项目(2020B-3106-0501)。

摘　　要：为了探讨不同形式微型桩在滑坡作用下对山区管道防护的变形机制,以中贵天然气管道滑坡为背景,开展了常规微型群桩和花管微型群桩室内对比模型试验。采用应变、土压力传感器以及百分表对单桩弯矩、群桩两侧土压力以及位移进行了分析。结果表明:在花管微型桩防护一侧燃气管道保存的较为完整,常规微型桩防护一侧管道受挤压产生破坏;桩体弯矩最大值均出现在滑带附近,并且在承台的联系作用下,群桩桩顶位置会产生较大弯矩;花管微型群桩在桩、水泥浆共同作用下很好地改善了土体的力学性能,形成的密实结构能更好地抵抗滑坡推力的作用,减少了桩体的弯曲变形;微型桩对于小型滑坡具有很好的防护效果,并且花管桩在达到极限承载力后仍能起到有效的防护作用。To explore the deformation mechanism of different forms of micro piles in the protection of pipelines in mountainous areas under the action of landslides,the indoor comparative model tests of conventional micro-pile groups and flower tube micro-pile groups were carried out in the background of the ZhongGui natural gas pipeline landslide.The single pile bending moment,soil pressure,and displacement on both sides of the pile group were analyzed by using strain,soil pressure sensor,and dial indicator.The results show that the gas pipeline on the protection side of the flower tube micropile is relatively complete,while the pipeline on the side of the conventional micro-pile protection is damaged by extrusion.Under the action of the pile group pile top position,a large bending moment will be generated.Under the combined action of the pile and the cement slurry,the micropile group of the flower tube can improve the mechanical properties of the soil,and the formed dense structure can better resist the thrust of the landslide.It can reduce the bending deformation of the pile body.The micropile has a good protective effect on small landslides,and the flower tube pile can still play an effective protective role after reaching the ultimate bearing capacity.

关 键 词：滑坡 模型试验 微型桩 自然灾害 变形机制 

分 类 号：TU473[建筑科学—结构工程]