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Field Behaviour of Buried Water and Gas Pipes in Expansive Soil

机译：膨胀土中埋地水和煤气管道的现场行为

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Failures in ageing buried pipelines have been identified as a major ongoing problem for water,rnwastewater and gas authorities in Australia. The consequences of such failures can include servicerndisruptions and significant repair costs, as well as external factors including environmental disruptionsrnand health risks. The failure in a given pipeline depends on the local soil conditions, extreme climate,rnand external loading etc. The soil condition and climate change are the most important factors whichrncan cause unexpected failures. The differential movements in expansive soil (i.e., shrinking andrnswelling), produced as a result of varying moisture content along the pipeline, can create a stressrnconditions which may exceed the capacity of the pipe segments, causing them to fail.rnA study was conducted by Monash University to investigate the effects of climate and local soilrncondition on buried reticulation water and gas mains. The instrumentation included sensors tornmeasure pipe wall strains, in-situ soil water content, soil movement, soil pressure and temperature. Arnweather station was installed to collect the climate parameters such as air temperature, solarrnradiation, rainfall etc. The performance of water and gas pipe was monitored for more than two years.rnOn the basis of field monitoring data and long-term climate modelling results, this paper explains thernpossible failure mechanisms and long-term safety of theses pipelines. It is evident that substantialrnstresses can develop on the pipes due to seasonal ground movements and pipes can fail under thesernstresses if they have undergone strength deterioration, as occur commonly due to corrosion in castrniron pipes.
机译：对于澳大利亚的水，废水和天然气主管部门来说，老化的地下管道故障已被确定为主要的持续性问题。此类故障的后果可能包括服务中断和巨大的维修成本，以及包括环境破坏和健康风险在内的外部因素。给定管道的故障取决于当地的土壤条件，极端气候，外部负载等。土壤条件和气候变化是可能导致意外故障的最重要因素。沿管道中水分含量变化而产生的膨胀土壤中的差异运动（即收缩和溶胀）会产生应力条件，该条件可能超过管段的容量，从而导致其失效。莫纳什进行了一项研究大学调查了气候和当地土壤条件对埋藏的网状水和煤气干线的影响。仪器包括传感器，用于测量管壁应变，原位土壤含水量，土壤运动，土壤压力和温度。安装了Arnweather站以收集空气温度，太阳辐射，降雨等气候参数。对水和煤气管道的性能进行了两年以上的监测。rn根据现场监测数据和长期气候模拟结果，论文解释了这些管道的可能的故障机理和长期安全性。显然，由于季节性地面运动，可能在管道上产生大量应力，如果管道经受了强度降低（如通常由于铸铁管道的腐蚀而发生的），则它们可能会在应力作用下失效。

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