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In order to study the chemical corrosion and temperature coupling effect on the triaxial compression mechanical properties of white sandstone, first, the white sandstone is soaked in acidic, neutral, and alkaline solutions respectively in different temperatures, after that, triaxial compression tests were carried out on the treated white sandstone, then, the strength and deformation of white sandstone after coupling action are analyzed, finally, the chemical corrosion and temperature coupling mechanism is studied. The results show that: At the same temperature (below 100°C),the triaxial compressive strength of the specimens in acidic and alkaline environments is lower than that in neutral environments. In the same chemical (acid or alkali) environment, the triaxial compressive strength of the specimen decreases with the increase of temperature (below 100°C); In a neutral environment, with the increase of temperature (below 100°C),the triaxial compressive strength of the specimen decreases slowly and basically remains unchanged. Below 100°C, the damage of rock caused by temperature is small and can be ignored; Different chemical (acid or alkali) environment can degrade rock damage and reduce its triaxial compressive strength. Temperature mainly affects the rate of chemical reaction, which damages the rock and reduces its strength.

Industrial robot is a potential alternative of machining tool in some certain process due to its flexibility and large workspace. The traditional stiffness model of robot cannot explain the situation that stiffness exits difference in opposite directions. Aiming at optimizing the robot side milling process, a measured stiffness performance evaluation index is proposed in this paper. It is deduced and calculated through actual measured data, which overcomes the shortcoming of other indexes deduced from traditional stiffness model. Experimental case indicates that the new index proposed in useful in feed direction and tool-workpiece relative position optimization.