Experimental study on transverse isotropy strength parameter of quartz-mica schist
LIU Jie1，2，WANG Lian1，LI Jianlin1，2，YUAN Tengfei3，YAN Lizhou1
(1.College of Civil Engineering and Architecture，China Three Gorges University，Yichang，Hubei 443002，China； 2.Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；3. BCEG Advanced Construction Materials Co.，Ltd.，Beijing 100015，China)
The tensile strength，deformation modulus，Poisson's ratio and other anisotropy parameters of quartz mica schist are studied by splitting test. A single rock specimen is designed to test the tensile strength of rock under different splitting surface and schistosity angle. According to the relative difference between the tensile strength and the variance value of the rock specimen after multiple rock fracturing，a method of distinguishing good and poor sandstone homogeneity is proposed. The results show that the variation of tensile strength，tensile modulus，Poisson¢s ratio and splitting surface and the schistosity angle q of the rock are as follows：The tensile strength of quartz mica schist increases linearly with the increase of q. The size effect of tensile strength decreases linearly with the increase of q. The anisotropic degree of tensile strength decreases as the height of the rock sample increases. When 0°＜q＜50°，the tensile modulus decreases with the increase of q，and the Poisson's ratio increases with the increase of q；When 50°＜q＜90°，the tensile modulus increases with the increase of q，and the Poisson¢s ratio decreases with the increase of q. The single and triaxial tests were carried out on the samples of dry and saturated states.The results show that the quartz mica schist in the dry and saturated state belongs to low anisotropy of rock mass；The elastic modulus，internal friction angle and cohesive force under dry and saturated condition increase linearly with the increase of confining pressure.
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2017, Vol. 36 
