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地裂缝是西安市最典型的城市地质灾害,对地下管道造成了严重的危害。以西安市地下输水(排污)管道穿越地裂缝为背景,在地裂缝对地下管道危害分析的基础上,通过地裂缝活动对地下管道影响的足尺模型试验,研究地裂缝作用下地下管道的受力情况、变形和破坏模式。试验结果表明:在地裂缝作用下,无论是骑缝式还是对缝式敷设地下管道受力较为复杂,管道处于拉压受力状态,其变形破坏模式大致可以分为2类即骑缝时反向弯曲的弹性地基梁破坏模式和对缝时端部上翘的悬臂梁破坏模式;管道开裂破坏的地裂缝位错量临界值为S_(cr)=6 cm;骑缝式管道开裂破坏位置主要位于下盘靠近地裂缝0.5 m范围内,而对缝式管道开裂破坏位置主要位于上盘距地裂缝1.2 m附近以及接头部位。基于模型试验结果,提出地裂缝发育区管道工程建设应采取避让和合理规划管线走向,对跨越地裂缝带的管道工程需采取管沟浅埋或悬空式架设、柔性管材及接头加固、地下廊道铺设以及监测预警等防治措施。研究结果对于西安市城市管网建设与跨越地裂缝带的老旧管网改造具有重要的指导意义,对其他地裂缝发育区管道工程建设亦具有参考与借鉴价值。
Ground fissures are the most typical urban geological disasters in Xi’an, causing serious damage to underground pipelines. Based on the ground fissures of underground water (sewer) pipes in Xi’an City, based on the analysis of the hazards of ground fissures to the underground pipelines, a full-scale model test of the influence of ground fissures on the underground pipelines was conducted to study the effects of ground fissures Force situation, deformation and destruction mode. The test results show that under the action of ground fissures, both the saddle-stitched and the stitched underground pipelines are more complicated and the pipe is under tension and compression. The deformation and failure modes can be divided into two types: reverse bending ; The critical value of ground fissure dislocation of pipeline cracking is S_ (cr) = 6 cm; the position of cracking and cracking of riding pipe is mainly located in the bottom plate Close to the ground fissure within 0.5 m, while the crack-type pipe cracking damage mainly located in the upper plate from the ground fissures 1.2 m near the joint and the site. Based on the results of the model test, it is proposed that the construction of pipeline in the development zone of ground fissures should take the avoidance and rational planning of the pipeline trend. The pipeline project crossing the ground fissure zone needs to be erected shallowly by ditch or suspended, flexible pipe and joint reinforcement, Laying and monitoring and warning and other prevention and control measures. The results of this study are of great significance to the urban pipe network construction in Xi’an City and the transformation of the old pipe network spanning the fissure zone, and also have reference and reference value for the construction of pipeline projects in other development zones with ground fissures.