(1. School of Geological Engineering and Geomatics，Changan University，Xian，Shaanxi 710054，China；2. Key Laboratory of Western Chinas Mineral Resources and Geological Engineering，Ministry of Education，Changan University，Xian，Shaanxi 710054，China)
Abstract：Ground fissure is the most typical geological disaster which has endangered the safe use of underground pipes in Xi 'an city. Based on the analysis of the harm on underground pipes induced by ground fissure，full-scale model test was carried out to study the force condition，deformation and failure modes of underground pipeline crossing the active ground fissure. The model test results show that whichever layout mode of underground pipeline is (riding or joint riding across ground fissure)，the stress on the pipeline is sophisticated and pipeline is in tension and compression simultaneously. The deformation and failure modes of pipeline can be divided into two kinds that one is reverse bending-elastic foundation beam failure mode，the other is terminal warping-cantilever beam failure mode. The critical value of ground fissure dislocation leading to crack failure of underground pipeline is 6cm. For pipeline riding across ground fissure，cracks mainly appear in the range of 0.5 m from the position of ground fissure at foot wall. As to pipeline with joints riding across ground fissure，cracks mainly appear at the spot with a distance of 1.2 m from ground fissure at the hanging wall. So keeping a certain distance from the ground fissures and reasonable planning should be adopted for the underground pipeline construction in ground fissure developed areas. As for underground pipelines crossing the ground fissures，the necessary countermeasures such as shallow buried pipe ditch，overhead setup，flexible pipes，joint reinforcement，underground corridor and monitoring and early warning etc. should be taken to avoid and prevent the crack failure of pipelines induced by active ground fissure. The conclusions can be presented as the reference to plan of new pipeline network and old network reconstruction in Xian city and also to pipeline engineering construction of other developed areas of ground fissures.
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2016, Vol. 35 
