Study On The Law Of The Buried Water Suppiy Pipes Damage Under Earthquake

Urban water supply pipe network of water pipelines and water distribution network is particularly important due to the water supply network wide coverage, after the earthquake, the city life and production impacts, thus strengthening the rescue efforts of the urban pipeline. At present, the seismic design of water supply network is still in its preliminary stage, the theoretical basis is not perfect, therefore, it is necessary to combine the major earthquake in the Wenchuan earthquake and the history of statistics and experience of municipal pipelines, earthquake damage, damage to the municipal pipeline in the form summarize, and to analyze the shock of the municipal pipeline strategy.In this paper, the full sum at home and abroad many times in history a major earthquake disaster information collected on the basis of the type of buried water supply pipelines subjected to earthquake damage and influencing factors were analyzed and summarized in the wave propagation under the damage to the pipelinemainly in the form of tube damage, joint damage, fittings and junction destruction. Pipeline earthquake impact factors including the intensity of an earthquake, pipe laying and geological environment, the contents of the materials used in buried pipelines, pipe and pipe connections, and the radius of the buried pipeline. Larger destructive of the high intensity regions; destructive of integrity and poor rock environment; low tensile strength, pressure, shear, and destructive of the folded material is significantly greater than the steel high-resistance material; welding connection destructive than threaded connection destructive; destructive of the same material of the large diameter lower than the small diameter of the destructive. Cast iron pipe and PE pipe is commonly used pipe of urban water supply project, The interface of the seismic performance of water supply pipe network design must be considered one of the factors of earthquake-prone areas for the study of the mechanical properties of its interface, using a prototype pull-out test, measuredpipeline interface drawing force and interface deformation analysis shows that the experimental data, DN100cast iron pipe to withstand the maximum pull of about4KN displacement value not exceeding6cm, test analysis of the DN300value greater than the value of the DN100test analysis; the PEtube form of the damage is random, should strictly control the construction quality of the PE pipe hot melt connection; ideal for connection of an ideal elastic material, FLAC3D numerical simulation value is slightly larger than the experimental values, and with the buried pipeline graduallyaging-related mechanical properties of gradual decline.