闪长岩力学性能实验

Experimental on mechanical properties of Diorite

针对燕山期的蚀变闪长岩静动态基础力学参数缺乏的问题.采用现场取样、现场试验及实验室实验的方法,分别对闪长岩岩石样本进行了密度测试、点载荷仪的点载荷试验、压力机的单轴抗压强度试验和声波测试仪的纵横波测试试验.得到了该燕山期蚀变闪长岩的密度为2 848 kg/m3、点载荷强度为7.12 MPa,单轴抗压强度为140.68 MPa,纵波平均波速为4 797 m/s,横波平均波速为2 705 m/s,并在此试验数据基础上运用弹性波理论计算公式得出了该闪长岩试件的动弹性模量52.8GPa和动泊松比0.267.该试验结果为制定井筒爆破方案设计及确定脆性岩石材料本构模型参数提供参考数据.

To the question of data deficiencies of basic mechanical parameters about diorite in the Yanshan period,using field sampling,field tests and laboratory experiments methods,this study conducted the density test,point load test,uniaxial compressive strength test,the speed of longitudinal wave and transverse wave test.The results show that the density of diorite in the Yanshan period is 2848kg/m3,the point load strength is 7.12MPa,the uniaxial compressive strength is 140.68MPa,and the average velocity of longitudinal wave and transverse wave is 4797m/s and 2705m/s.Based on the experimental data using the elastic wave theory calculation formula,this study obtained the diorite dynamic poisson ratio 0.267 and dynamic modulus of elasticity 52.8GPa,which can provide the reference data for the shaft blasting design and diorite material constitutive model.