| The rapid development of society and city construction increase the demand for urban underground pipelines.With its excellent physical properties of PE pipe, which have high corrosion resistance, toughness, scratch resistance and simple construction program during the construction process, and during used in the process to be performed without prejudice to the use of better maintenance, PE pipes are widely used in water supply, drainage, gas, mines (with resistance tubes), chemical and other fields.But as urban roads and housing construction on the underground soil disturbance, excessive exploitation of groundwater in urban, as well as earthquakes that non-anthropogenic causes of sudden ground subsidence soil near the underground pipe leading to phenomena such as the collapse of soil around the pipe, make a serious crisis to urban underground pipeline correctly, and hazards to human life and health.The article by GEO slot to full scale laboratory experiments,analysis of the underground pipeline in case of pipeline of surrounding soil subsidence deformation of the pipe,Through test research which has different diameter, and different wall thick of underground PE pipeline of in using was burst sexual Foundation subsidence pipeline of settlement and deformation situation, has underground PE pipeline in using process in the dang suffered burst sexual Foundation subsidence of damage and the pre-judgment standard and different pipeline od, different pipeline wall thick in pipeline was burst sexual party situation on pipeline settlement deformation of effect. This article mainly covers the following areas:1. Comparing of several common formulas for calculation of earth pressure of above the line, and noted the formula’s limitations. Underground pipes above the soil pressure of the experimentally measured value to compare the result of the formula, formula coefficient of adjustment through underground pipes, applied to test cases drawn underground PE pipe above the earth pressure calculation formula offers experimental and theoretical basis of soil pressure calculation of underground pipes.2. Tthrough the soil pressure of calculation formula, research discussion pipeline in below soil body collapse of situation underground pipeline of deformation curve, basis underground pipeline of construction design and the using specification, determines pipeline in occurred effect using State Shi of deflection Shi underground pipeline of by force and the deformation curve, to discriminant out pipeline in below soil body collapse of holes of size, established pipeline damage of pre-discriminant standard, to through has some underground pipeline detection system (exploration to radar, and Infra-red detection, etc) better prevention of pipeline pipes due to large deformation damage, ensure normal human life.3. Doing pipe model experiment in the laboratory, by using a different outer diameter, wall thickness, as well as in different soil in the upper part of underground pipeline pipeline under high deformation experiment, discussed in the underground piping under normal usage and pipe diameter, wall thickness and the relationship between pipes of the upper soil parameters such as height, provided for the design and construction of underground PE pipe to provide references. By results of calculation of earth pressure to discuss different diameter, wall thickness of the pipe and the pipe below the holes between the calculated width of, and provide the basis for the actual calculation and design of the pipe.This research through the establishment of experimental model of experimental simulation based on actual, is the usage of underground PE pipe trying to explore, on the underground PE pipe deformation and failure analysis of certain representative, especially the obtained through experiments varying pipe diameter, wall thickness of the pipe and the pipe buried depth effect on deformation of the pipe has the reference value, but related theory and practice need further improvement. |
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