Experimental study on the model of wide load transfer and settlement characteristics of high-speed railway subgrade

Taking the subgrade width of high-speed railway as the research background, the indoor model test with geometric similarity ratio of 1:10 was established to simulate the working condition of high-speed railway subgrade width with or without geogrid in loess area, and the stress characteristics and settlement deformation law of subgrade width structure under two working conditions were studied. The test results show that the internal vertical stress of the widening subgrade increases with the increase of load, and decreases with the depth of subgrade. The maximum settlement occurs at the junction of existing and new subgrade, which leads to uneven settlement of existing new subgrade. After the geogrid is set inside the new subgrade, the vertical stress and subgrade settlement inside the subgrade are significantly reduced, and the uneven settlement of the subgrade is slowed down.