This paper presents a methodology for determining the uniaxial and triaxial compressive strength of heterogeneous material composed of dacite (D) and altered dacite (AD). A zone of gradual transition from altered dacite to dacite was observed in the rock mass. The mechanical properties of the rock material in that zone were determined by laboratory tests of composite samples that consisted of rock material discs. However, the functional dependence on the strength parameter alteration of the rock material (UCS, intact UCS of the rock material, and m_i) with an increase in the participation of “weaker” rock material was determined based on the test results of uniaxial and triaxial compressive strength. The participation of altered dacite directly affects the mode and mechanism of failure during testing. Uniaxial compressive strength (σ_ci^UCS) and intact uniaxial compressive strength (σ_ci^TX) decrease exponentially with increased AD volumetric participation. The critical ratio at which the uniaxial compressive strength of the composite sample equals the strength of the uniform AD sample was at a percentage of 30% AD. Comparison of the obtained exponential equation with practical suggestions shows a good correspondence. The suggested methodology for determining heterogeneous rock mass strength parameters allows us to determine the influence of rock material heterogeneity on the values σ_ci^UCS, σ_ci^TX, and constant m_i. Obtained σ_ci^TX and constant m_i dependences define more reliable rock material strength parameter values, which can be used, along with rock mass classification systems, as a basis for assessing rock mass parameters. Therefore, it is possible to predict the strength parameters of the heterogeneous rock mass at the transition of hard (D) and weak rock (AD) based on all calculated strength parameters for different participation of AD.

中文翻译：

---

用实验室方法测定变质英安岩的机械性能

本文提出了一种确定由英安岩 (D) 和蚀变英安岩 (AD) 组成的异质材料的单轴和三轴抗压强度的方法。在岩体中观察到一个从蚀变英安岩逐渐过渡到英安岩的区域。该区域中岩石材料的力学特性是通过对由岩石材料盘组成的复合样品进行实验室测试来确定的。然而，对岩石材料强度参数变化的函数依赖性（UCS，岩石材料的完整UCS，和m _i) 随着“较弱”岩石材料的参与增加，根据单轴和三轴抗压强度的测试结果确定。变质英安岩的参与直接影响测试过程中的失效模式和机制。单轴抗压强度 ( σ _ci ^UCS ) 和完整单轴抗压强度 ( σ _ci ^{TX )}) 随着 AD 体积参与度的增加呈指数下降。复合样品的单轴抗压强度等于均匀 AD 样品强度的临界比率为 30% AD。得到的指数方程与实际建议的比较显示出良好的对应关系。用于确定多相岩体强度参数建议的方法使我们能够确定上的值的岩石材料的异质性的影响σ _CI ^UCS，σ _CI ^TX，和恒定米_我。得到σ _ci ^TX和常数m _i相关性定义了更可靠的岩石材料强度参数值，这些值可以与岩体分类系统一起用作评估岩体参数的基础。因此，可以根据所有计算出的AD不同参与强度参数，预测硬岩（D）和弱岩（AD）过渡处的非均质岩体的强度参数。