Soft ground treatment design geogrid geogrid treatment the the soft subgrade failure mechanism and not using geogrid processing soft subgrade failure mode has a significantly different. Geogrid processing roadbed thick soft soil to the circular slip or sink uplift destruction. In a thin layer on the soft soil, compared with lateral extrusion destruction. Using geogrid processing embankment, have reinforced cushion, reinforced material huge impact on the form of its destruction, roughly divided into the following three types: (1) deep circular slip, soft thick soil embankment (D / B> 0.33 is a thick soft soil where D is the soft soil thickness, B for the width of the embankment bottom, the same below). (2) shallow horizontal sliding, apply to the small thickness of the soft ground (D/B1, increase H, retry count, until when qu / qa = 1, was the height of the embankment limit. 3 city gas pipeline network safe operation related to people's lives and property safety, a matter of social stability, to ensure the safe operation of a new era of urban construction and development needs, the needs of urban safety management, but also the history of the task entrusted to us. prevent accidents and ensure safety in production, China has promulgated the "Regulations on the Protection of the oil and natural gas pipelines, oil and gas pipeline safety supervision and management regulations" regulations made clear provisions on safety supervision and management of oil and gas pipelines, we must strengthen basic management, standardize the market order to further explore security operation and management of the new methods, new ideas. together with governmental, social, gas, design, construction, production, business units, duties, work together to strengthen the safety management of city gas, we will be able to reduce the harm it to better benefit the majority of urban residents. summary, the application of geogrid reinforced foundation has higher stress diffusion, the confining role and the ability to adjust the stress distribution, can significantly reduce the foundation deformation, reducing the difference settlement, give full play to the original soil bearing capacity and tensile strength, the application is effective in the treatment of soft ground, played a decisive role in the smooth progress of the construction and to speed up the construction speed, flexible and easy construction, short construction period has a good social applications the geogrid reinforced soft foundation and broad prospects. "aging" the situation, and then make a safety assessment, and to provide a scientific basis for the transformation. course, this pipeline accident repair should be worked out in advance of the old pipeline plan through the introduction of foreign advanced detection technology and testing equipment, improve the breadth and depth of the detection and evaluation.