交通荷载对不同湿度黄土路基承载力及变形特性的影响

Influence of Traffic Load on Bearing Capacity and Deformation Characteristics of Loess Subgrade with Different Humidity

为研究交通荷载对不同湿度状况黄土路基承载力及沉降变形的影响,深入探讨了不同含水率下黄土路基的承载及变形特性,分析了不同交通荷载,以及黄土路基在不同含水率条件下的应力分布和变形规律。研究结果表明:(1)随着含水率的增加,黄土路基的承载能力逐渐降低,含水率为6.5%的路基表层承载力较含水率为2.5%时降低46.93%。(2)重载交通路基表层承载力较中等交通和轻交通增加18.31%和40.72%,重载交通下,黄土路基的竖向沉降变形较大,路基内部竖向沉降变形较中等交通和轻交通时分别增加21.21%和75.32%。(3)随着路基内部与道路中心线横向距离的增加,路基横向变形逐渐减小,含水率为4.5%、6.5%的黄土路基中心点处竖向沉降变形较含水率为2.5%时,分别增加27.25%和113.4%。

In order to study the influence of traffic load on the bearing capacity and settlement deformation of loess roadbed under different humidity conditions,the bearing capacity and deformation characteristics of loess roadbed under different moisture content are deeply discussed in this study,the traffic load of different grades and the stress distribution and deformation law of loess roadbed under different moisture content are analyzed.The results show that:(1)With the increase of moisture content,the bearing capacity of loess roadbed decreases gradually.The bearing capacity of the surface layer of roadbed with moisture content of 6.5%is 46.93%lower than that of the orange layer with moisture content of 2.5%.(2)The surface bearing capacity of heavy traffic roadbed is 18.31%and 40.72%higher than that of medium traffic and light traffic.Under heavy traffic,the vertical settlement of loess roadbed is larger,compared with medium traffic and light traffic,the vertical settlement of roadbed increases by 21.21%and 75.32%respectively.(3)With the increase of the lateral distance between the roadbed and the center line of the road,the lateral deformation of the roadbed decreases gradually.When the vertical settlement deformation at the center point of the loess roadbed with the moisture content of 4.5%and 6.5%is 2.5%,increased by 27.25%and 113.4%respectively.