基于负压驱动的埋地燃气管道泄漏点定位方法OA

Based on the traditional detection hole local-ization method,this study proposes a leak point local-ization method for buried gas pipelines based on nega-tive pressure-driven principle(hereinafter referred to as the negative pressure localization method for short).The localization principle and localization steps are analyzed.By establishing negative pressure points,the original gas distribution in the soil is changed,and the leak location is determined by monitoring the changes in gas volume fraction in the detection holes.A numeri-cal model for gas leak diffusion in soil was developed to investigate the gas distribution under negative pres-sure suction conditions.Field tests and subsequent ex-cavation were conducted to verify both the distance be-tween the identified localization point and the actual leak center and the overall effectiveness of the method.The results demonstrate that the negative pressure lo-calization method achieves good localization results,while the uniformity of the soil structure exerts a mea-surable influence on localization accuracy.