Effect of soil particle and pore orientations on sound velocity

摘要

The main purpose of compressing soil dams, highway constructions, bridge abutments and fillings behind retaining wallsrnis to increase the bearing capacity, reduce consolidation settlement and permeability of clayey soils. However, the soil particlesrnand pore orientation could be somehow anisotropic due to a compaction-induced anisotropic structure. Orientationsrnof particles, pores and other constituents during compaction of a mixed mica schist clayey soil with fly ash were studied torninvestigate how soil structure, and in turn, sound velocity change during compaction of a cohesive soil at different moisturerncontents on all three sides at three are perpendicular to each other. Ultrasonic sound velocity measurements of the cubernsamples compressed in the optimum water content were investigated perpendicular to each other. The results showed that thernultrasonic sound velocity decreased in the compression direction of the soil samples, namely the overall degree of preferredrnorientation increases as opposed to the compression direction. On the other hand, the overall degree of preferred horizontalrnorientation increases and ultrasonic sound velocity decreases.