荷载作用下路基沉降特点的数值模拟  

Numerical simulation analysis of settlement characteristics of roadbed under loads

作　　者：王亨通 孙世国 王瑞龙 赵瑞华 WANG Hengtong;SUN Shiguo;WANG Ruilong;ZHAO Ruihua(School of Civil Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]北方工业大学土木工程学院,北京100144

出　　处：《邵阳学院学报(自然科学版)》2024年第6期85-93,共9页Journal of Shaoyang University:Natural Science Edition

基　　金：国家自然科学基金(41772335);北方工业大学有组织科研(2023YZKY01)。

摘　　要：本研究旨在探讨静荷载和动静叠加荷载对混凝土道路路基沉降的影响,以深入理解路基沉降特征和机制。选取某混凝土道路作为研究样本,利用FLAC3D软件进行数值模拟,评估两种工况下的路基沉降情况。研究结果显示,施加的荷载大小与路基沉降量呈正相关:当荷载增大时,沉降量随之增大;而荷载减小时,沉降量随之减小。此外,荷载对沉降量的影响还与施加点的水平距离和深度有关:距离较远的施加点处的沉降较小,而距离较近的施加点处的沉降较大;在深度方面,靠近地表的区域沉降显著高于深层区域。在多个荷载的连线路径上,沉降的最大区域位于施加荷载的中心位置,向两侧和深部延伸时,沉降逐渐减小。在4个集中荷载作用下,非均匀影响深度约为地面下10m。动静叠加荷载造成的最大沉降量约为单一静荷载的2.8倍,且其沉降中心位于4个荷载的几何中心,而单一静荷载的沉降中心则为4个荷载作用位置的几何连线区域,形成一个平底沉降区。This study investigated the impact of static and combined dynamic-static loads on the settlement of concrete roadbeds,aiming to enhance the understanding of the characteristics and mechanisms of settlement.It chose a specific concrete road as the research sample and used FLAC 3D software for numerical simulations to assess the roadbed settlement under the two loading conditions.The results indicated a positive correlation between the magnitude of the applied load and the settlement amount.As the load increases,so does the settlement,while a decrease in load leads to reduced settlement.Moreover,the influence of the load on settlement varies with the horizontal distance of the load application points to the settlement center and the depth of the roadbed.Settlement is lower at application points far from the settlement center but higher at closer ones.Regarding depth,areas near the surface show significantly greater settlement than deeper regions.Within the connecting path of multiple loads,the maximum settlement occurs at the center of the load application area,gradually decreasing toward the sides and the deeper sections of the roadbed.Analysis of the settlement curve revealed that the depth of non-uniform impacts under four concentrated loads extended to approximately 10 meters below the surface.The maximum settlement caused by combined dynamic-static loads was roughly 2.8 times greater than that of single static loads,and the settlement center was located at the geometric center of the four load applications.In contrast,the settlement center of static loads created a flat-bottomed settlement zone along the geometric connection of the four load application points.

关 键 词：路基 数值模拟 静荷载 动静叠加荷载 沉降 

分 类 号：TU997[建筑科学—市政工程]