交通动载作用下基坑支护模拟研究

Research on simulation of foundation pit support under traffic dynamic load

随着城市化的快速发展,交通主干道旁侧深基坑施工越来越常见,其交通荷载会对临近基坑的稳定和安全造成一定影响。为了研究交通动载对基坑围护结构的影响,以吉林大学第一医院地下停车场为背景,通过有限元软件Plaxis2D分析了交通动载行驶车速、作用时间、作用距离以及车辆大小对基坑围护结构的影响。结果表明:围护结构的水平位移与车辆速度成正比,并且随着车辆速度的增大,其增长幅度也随之增大;交通动力载荷对围护结构的影响会随着时间而逐渐积累,当积累到一定程度时,其位移不再增加;与距离成反比,随车流荷载作用距离的减小,支护结构的水平位移也随之增加;相比小车,大车作用时围护结构变形增大了50%多。

With the rapid development of urbanization,the construction of deep foundation pit on the side of the main traffic road is more and more common,and its traffic load will have a certain impact on the stability and safety of the adjacent foundation pit.In order to study the impact of traffic dynamic load on the foundation pit envelope,the finite element software Plaxis2D was used to analyze the impact of traffic dynamic load on the foundation pit envelope through the background of the underground parking lot of the First Hospital of Jilin University.The results show that the horizontal displacement of the building envelope is proportional to the speed of the vehicle,and its increase amplitude increases with the increase of the speed of the vehicle.The influence of traffic dynamic load on the building envelope will gradually accumulate with time,and when the accumulation to a certain extent,its displacement will no longer increase.Inversely proportional to the distance,the horizontal displacement of the supporting structure increases with the decrease of the distance of traffic load.Compared with the small car,the deformation of the building envelope increases by more than 50%under the action of the large car.