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STUDY ON DAMAGE MECHANISM OF SANDSTONE UNDER HYDRO-PHYSICO-CHEMICAL EFFECTS
砂岩水物理化学损伤机制研究

Keywords: rock mechanics,sandstone,hydro-physico-chemical effect,damage mechanism,secondary porosity,CT scanning
岩石力学
,砂岩,水物理化学作用,损伤机制,次生孔隙率,CT扫描

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Abstract:

A series of tests on evolution of the porosity,pH value,as well as the mineral composition of sandstone under different water flow environments are conducted;and the micro-and meso-mechanisms of hydro-physico-chemical damage of sandstone are analyzed.Accordingly,a method is suggested,by which the secondary porosity individually induced by hydro-chemical interaction can be separated from the total secondary porosity through introducing the test value of secondary porosity of sandstone specimen under distilled water environment.And thereby,a representation of damage variable demonstrating the hydro-physico-chemical effect of sandstone is provided based on the variety of secondary porosity.Moreover,the CT scanning tests on the sandstone specimen with hydro-physico-chemical interaction of 180 days are carried out.The study reveals that the hydro-physical damage is mainly affected by the transfer and diffusion of cement materials,and debris in and around the pore of rock,and closely related to the hydro-chemical damage by the ion concentration and pH value in water solution.The varieties of mechanical behavior of sandstone induced by the hydro-physicochemical interaction are dominantly resulted from the secondary porosity,which can be divided into two parts,respectively caused by the hydro-physical and hydro-chemical effects.The comparison of the calculated damage values and CT values demonstrates that the representation of damage variable of sandstone is feasible.

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