Experimental Research on Compressive Performance of Modified Rammed Soil Based on Highland Barley Straw Fibers and Rubbles

In order to find a green, low-cost and high-performance modified raw soil method, samples were made from highland barley straw and gravel, which are unique in Qinghai-Tibet Plateau. The failure phenomenon, compressive strength, deformation capacity and load-displacement curve of different samples were studied, and the action mechanism and influence law of compressive strength of modified soil with different admixtures were analyzed and discussed. The test results show that when 0.25% highland barley straw and 20% gravel are mixed, the specimen has a smooth surface without dry shrinkage cracks, and its compressive strength and deformability are increased by 2.1 times and 30% respectively compared with that of plain soil. This content can be used as the best mixture ratio of this modified raw soil method.