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Study on Mechanical Properties of the Compound Soil of Feldspathic Sandstone and Sand Based on Micro – level

It is of great practical significance to study the mechanical properties of composite materials of arsenic and sandstone to control the ecological environment in soft sandstone area. In order to understand the material and structural characteristics of composite materials under different compound proportions, the microstructure and the composition of the material elements were analyzed by the microscopic test and the test of mercury injection from the microscopic level. The dynamic three axis instrument was used to carry out the mechanical test under the different mixing ratio. The results showed that the main mineral components of feldspathic sandstone are quartz, albite, montmorillonite and calcite. The structure has the strength in the anhydrous state. When the water is saturated, the structure collapses, the cohesive force decreases rapidly, and it has the collapsibility; Due to the complexity of the structure and the optimization of the gradation, the permeability is greatly reduced; the macroscopic mechanics exhibits strain hardening and nonlinear characteristics.