不同时期定向钻穿越管道对堤防的影响分析

分析长输管道定向钻穿越河流施工期、运行期、弃用期可能引起的堤防土体特征变化，结合工程实例，利用数值法对最不利水文条件下管道工程对堤防区域地下水流场的影响进行计算，结果表明：管道施工会引起管孔范围内水利坡度的增大；管道运行期和弃用期会增加管壁附近土体的渗透性，减小地下水渗透路径，增大发生管涌危害的可能性。

Impact of Directional Drilling Pipeline Crossing Dike in Different Periods

Many factors were analysed such as the changes in soil characteristics during construction period, runing period and deprecated period cause by long distance directional drilling pipeline crossing river.Taking the engineering as an example, the numerical method for the affect of pipeline project under most unfavorable hydrological conditions is building. The results showed that the pipeline construction will cause the hydraulic gradient increases during construction period, and pipeline running and abandoned period will increase the permeability of the soil near the wall, reducing groundwater infiltration path and increasing the possibility of piping hazards.