运煤重载黄土路基动态回弹模量加载序列确定

Determination of loading sequence for dynamic resilient modulus of subgrade in coal overloading loess areas

为研究运煤重载黄土地区路基应力水平,采用BISAR软件对运煤重载黄土地区23个典型的不同交通等级沥青路面结构进行路基应力水平分析,计算荷载分别采用0.7 MPa、1.0 MPa和1.3 MPa三种,得到路基内的应力水平及主应力覆盖范围.结果表明：高速、一级公路沥青路面结构路基的最大主应力范围为10-130kPa,最小主应力范围为0-50 kPa,二级公路最大主应力范围为10-100 kPa,最小主应力范围为0-40 kPa.在此基础上提出了适合运煤重载黄土地区沥青路面结构路基动态回弹模量应力加载序列.

In order to research on subgrade stress level of coal overloading loess area,this paper used BISAR to analyze subgrade stress level of different traffic grade of 23 asphalt pavement structures in coal overloading loess area.Three computational load of 0.7 MPa,1.0 MPa,1.3 MPa were used in the calculation and the stress level in the subgrade and the principal stress range were obtained.The result shows that for highway and arterial roads,maximum principal stress range is 10 kPa-130 kPa,and minimum principal stress range is 0-50 kPa.For grade ii roads,maximum principal stress range is 10 kPa-100 kPa,and minimum principal stress range is 0-40 kPa.On this basis,this paper presented the stress loading sequence parameter of dynamic resilient modulus suitable for the subgrade of asphalt pavement structures in coal overloading loess areas