Ｓｅｔｔｌｅ3Ｄ软件在黄土公路路基变形分析中的应用

公路填筑过程路基沉降和工后沉降，将直接影响公路建设质量和后期的维护费用。为了探明黄土路基的变形机理，运用Ｓｅｔｔｌｅ3Ｄ软件，模拟天然和降雨情况下，对黄土路基不同填筑阶段的沉降进行数值分析，以便获得黄土公路路基填筑时期的变形规律。研究结果表明:沉降整体呈“浴缸”状，路基中心位置沉降量最大，沿中心线向两边沉降逐渐减小；沉降量随着深度的增加而减小，持力层表面的沉降量最大。各填筑阶段之间的沉降量呈非线性减小并最终趋于稳定；同一阶段下原状黄土的沉降量大于压实黄土的沉降量。降雨能够明显增加原状黄土路基的沉降量，而对压实黄土沉降量的增大效果不明显，因此施工过程中控制路基压实质量和采取合理的路基防水排水措施显得非常重要。

Application of Settle3D Software in Deformation Analysis of Loess Highway Subgrade

The settlement of subgrade during highway filling period and after construction directly affects the quality of highway construction and the maintenance costs during the run time.The settlement of loess roadbed at different filling stages is analyzed by using Settle3D software to simulate natural and rainfall conditions,so as to obtain the deformation rule of loess highway subgrade during filling period.The results show that the settlement is in the shape of the"bathtub"as a whole.The settlement in the center of the subgrade is the largest,and the settlement decreases gradually along the centerline.The settlement decreases with the increase of depth,and the settlement on the bearing layer surface is the largest.The settlement difference between different construction stages has a nonlinear decreasing trend.At the last stage of construction,the settlement deformation of loess tends to be stable.The settlement of undisturbed loess is higher than that of compacted loess at the same stage.Rainfall increases the settlement of undisturbed loess subgrade,but the effect on the settlement of compacted loess is not apparent.Therefore,it is vital to control the compaction quality of the subgrade and to take the waterproof and drainage measures.