中文摘要：

地下管廊常因填土沉降和外部荷载等原因造成管廊结构崩溃、接口错位、脱节、管身裂缝、破损等结构损伤。针对填土沉降和外部荷载作用下管廊出现的问题,结合益阳管廊项目,利用FLAC3D有限差分方法模拟土工布对填土沉降的防护以及土工格栅的构造因素对外部荷载作用下的管廊防护进行研究,模拟结果表明：益阳管廊底部铺设土工布可以有效控制填土沉降;管廊上部铺设3层,宽度为12 m的土工格栅有效减轻、分散外部荷载对管廊的作用力。

英文摘要：

Because of the settlement of the embankment and the external load,the structure of the underground pipe gallery may be damaged,such as collapse of the pipe gallery,dislocation of the interface,disconnection,crack and damage of the pipe body. Focusing on the problems of the pipe gallery under the settlement of the fill and the external load,By taking the pipe gallery project in Yiyang city as an example,this paper adopted FLAC3 Dfinite difference method simulation of geotextile on the settlement protection and the construction of geogrid,and the protection of pipe gallery under external load are studied. Analysis of simulation results show that the geotextile can be controlled effectively by laying geotextile at the bottom of this pipe gallery and the upper part of the pipe is provided with 3 layers,and the geogrid with a width of 12 m can effectively reduce and disperse the force of the external load on the pipe gallery.