供水管道45°斜穿地裂缝足尺模型试验研究  

Full-scale model test on feed pipeline crossing earth fissure with an angle of 45°

作　　者：刘聪[1,2,3] 乔建伟 闫腾飞 卢全中 占洁伟[1,3] 彭建兵 Liu Cong;Qiao Jianwei;Yan Tengfei;Lu Quanzhong;Zhan Jiewei;Peng Jianbing(Chang'an University,Xi'an 710054,China;Key Laboratory of Earth Fissures Geological Disaster,Ministry of Natural Resources,Nanjing 210018,China;Field Scientific Observation and Research Station of Ground Fissure and Land Subsidence in Xi’an of Shaanxi,Ministry of Natural Resources,Xi'an 710054,China;China JK Institute of Engineering and Design,Xi'an 710043,China;Shaanxi Key Laboratory for the Property and Treatment of Special Soil and Rock,Xi'an 710043,China)

机构地区：[1]长安大学,陕西西安710054 [2]自然资源部地裂缝地质灾害重点实验室,江苏南京210018 [3]自然资源部陕西西安地裂缝与地面沉降野外科学观测研究站,陕西西安710054 [4]机械工业勘察设计研究院有限公司,陕西西安710043 [5]陕西省特殊岩土性质与处理重点实验室,陕西西安710043

出　　处：《土木工程学报》2023年第5期102-111,共10页China Civil Engineering Journal

基　　金：国家自然科学基金项目(41877250,41790441);自然资源部地面沉降监测与防治重点实验室开放基金(KLLSMP202001);长安大学中央高校基本科研业务费专项资金(300102268206,300102260402);CMEC孵化科技项目(CMEC-KJFH-2018-02)。

摘　　要：西安地裂缝是一种典型的城市地质灾害,对供水管道造成严重危害。以西安市球墨铸铁供水管道穿越地裂缝为工程背景,通过供水管道45°斜穿地裂缝足尺模型试验,研究地裂缝作用下供水管道的变性特征、结构应力与土压力变化规律。试验结果表明,在地裂缝作用下,上盘管道产生差异沉降,远离地裂缝管道末端沉降量最大,上盘管道顶部和底部部分区域形成脱离区或脱空区。管道表现出复杂的伸臂梁受力模式,竖向上上盘管道产生“上凸下凹”的弯曲变形,顶部形成受拉区,底部形成受压区;下盘管道产生“上凹下凸”的弯曲变形,导致其顶部形成受压区,底部形成受拉区;水平方向上,地裂缝与管道锐角侧形成受拉区,钝角侧形成受压区。管道柔性T型接口可一定程度调节管道两侧差异沉降,且在管道接口处轴向应力最大。基于模型试验结果,提出地裂缝发育区管道建设应合理规划线路、浅埋或架空布设、采用柔性接口并增加接口强度和刚度、布设监测装置的工程措施。Earth fissure is the typical urban geological hazard which may seriously jeopardize feed pipeline in Xi'an city.With Xi'an ductile iron feed pipeline crossing the earth fissure as an example,the full-scale model test on feed pipeline crossing earth fissure at an angle of 45°was carried out to study the deformation characteristics,structural stress and variations of earth pressure.The test results show that the pipeline at hanging wall may have differential settlement and the settlement at the end of the pipeline far from the earth fissure is the largest.The parts of the top and bottom of the feed pipeline at hanging wall may detach from the surrounding soils.The pipeline shows a complex overhanging beam mode.Vertically,the pipeline in hanging wall forms"concave downward"bending deformation,with a tensile zone at the top of the pipeline and a compression zone at the bottom of the pipeline.The pipeline in footwall forms"concave upward"bending deformation,with a compression zone at the top and a tension zone at the bottom of the pipeline.Horizontally,a tensile zone is formed on the acute angle side of the pipeline relative to earth fissure,and a compression zone is formed on the obtuse angle side.To a certain extent,the flexible T-joint of the pipeline can adjust the differential settlement of both sides of the pipeline,and the axial stress at the flexible joint is the largest.Hence,based on the model test results,some necessary engineering measures,including planning reasonable route,designing shallow buried or overhead pipline,adopting flexible joint,increasing the strength and stiffness of flexible joint and arranging monitoring equipment,are suggested.

关 键 词：供水管道 地裂缝 柔性接口 球墨铸铁 模型试验 工程措施 

分 类 号：P642[天文地球—工程地质学]