Study on the Strength of Granite Slope Rock Mass under Freeze-thaw Cycles
Taking the granite slope rock mass in Yichun Luming Molybdenum Mine as an example,freeze-thaw cyclic u-niaxial compressive strength tests and longitudinal wave velocity tests were conducted on granite rock samples with different de-grees of weathering.It was found that the freeze-thaw cyclic uniaxial compressive strength and longitudinal wave velocity losses of granite with different degrees of weathering were different,and the freeze-thaw coefficient of granite with high degrees of weathering was lower;There is a linear relationship between the freeze-thaw coefficient of uniaxial compressive strength of gran-ite under freeze-thaw cycle and the damage variable of p-wave wave velocity,and the linear relationship is similar for different weathering types of granite.From the perspective of slope stability analysis,two methods for obtaining the strength parameters of granite slope rock mass under freeze-thaw cycles were proposed and verified through calculation.The results showed that:using uniaxial compressive strength freeze-thaw coefficient to directly reduce shear strength,or using longitudinal wave rapid freeze- thaw coefficient to reduce RMR value to derive shear strength,the obtained results can be used for slope stability calculation;Relatively speaking,the Factor of safety calculated by the latter is closer to the actual stability state of the slope.
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