Study on material properties and similar material proportion of weakly cemented water-resisting strata

Abstract

The material properties and similar materials of water-resisting strata play a significant role in the stability of the water-resisting layer and the influence of mining on the environment. According to scanning electron microscopy (SEM) and X-ray diffraction (XRD), the microstructure and mineral composition of weakly cemented water-resisting strata were analyzed, and the morphological characteristics and contents of clay minerals in the rock mass were also obtained. Moreover, given that the clay mineral contents are similar, taking fine river sands as aggregates and bentonite, gypsum, methyl silicone oil, and paraffin wax as additives, the physical and mechanical properties of similar materials such as the uniaxial compressive strength, deformation and fracture characteristics, and permeability coefficient were obtained under varying proportions of silicone oils, different paraffin contents, and no silicone oil. Thus, a new kind of weakly cemented water-resisting similar material has been developed. The results show that the uniaxial compressive strength of the material decreases as a power function and that the permeability coefficient decreases linearly under different silicone oil contents. With or without silicone oil, the material’s uniaxial compressive strength increases as a power function with an increasing paraffin content, and the permeability coefficient decreases in a logarithmic manner.