非对称性结构形式的公路路基拓宽工程响应分析

Response Analysis of Highway Subgrade Widening Engineering with Asymmetric Structure

为了获取非对称结构性的路基拓宽施工后的沉降变形与其内部应力分布规律,采用了有限元数值模型进行计算路基拓宽施工填筑的过程。研究结果表明:非对称性的路基结构在施工填筑作用下,其沉降变形也是不对称的,填土方量多的一侧则产生的沉降为最大,在本工程中路面最大的沉降值(36.71mm)位于路基右侧;在路基拓宽施工中,单侧进行施工填筑不利于控制旧路基路面的不均匀沉降变形;路基拓宽施工完成后,左右两侧的路基坡脚处沿地表深度的土体水平位移曲线均呈“鼓包”形状,其中最大水平位移值发生于右侧路基坡脚距离地表深度约15m处,其最大值为3.74mm,该值处于安全值范围内。

In order to obtain the settlement deformation and internal stress distribution law of asymmetric structural roadbed widening construction,the finite element numerical model is used to calculate the process of roadbed widening construction and filling.The research results show that the settlement deformation of the asymmetric subgrade structure is also asymmetrical under the action of construction and filling.36.71mm)is located on the right side of the roadbed;in the roadbed widening construction,the construction and filling on one side is not conducive to controlling the uneven settlement and deformation of the old roadbed pavement;The horizontal displacement curves of the soil are all in the shape of a"bulge".The maximum horizontal displacement value occurs at a depth of about 15m from the foot of the subgrade slope on the right side of the ground,and the maximum value is 3.74mm,which is within the safe value range.