Study on the Physical Properties of Compound Soils Mixed with Argillaceous Shale and Loess

This study conducted field experiments on the compounding of argillaceous shale and loess, measured the particle size distribution and soil moisture characteristic curves of the compound soils, and investigated the effects of argillaceous shale content on the physical properties of the compound soils. The following conclusions were drawn: The higher the content of argillaceous shale in the compound soil, the lower the content of silt and clay particles in the soil. The more argillaceous shale in the compound soil, the greater the soil porosity and air permeability, while the water-holding capacity decreases. As the content of argillaceous shale in the soil increases, the soil's water supply capacity gradually decreases. There are significant differences in the field water capacity (FC), wilting coefficient (WP), and available soil water content (TAW) of soils with different compounding ratios, and the available soil water content gradually decreases with the increase of argillaceous shale content in the soil. The results can provide scientific references for land improvement projects in mountainous areas with mixed soil and stone.