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为了研究滇西地震预报实验场地壳岩石的基本力学参数和变形破坏性状,我们对云南省大理县采石场出产的大理岩进行了三轴压缩实验。岩样产自前寒武系苍山群二段。苍山群与古生界至中生界含化石地层均为断层接触。岩样呈灰白色,中等粒度,致密,无宏观节理裂隙,基本上可视为各向同性。岩样全分析结果见表1,热差、热重和红外光分析结果表明,岩样的主要矿物成分为方解石。
In order to study the basic mechanical parameters and deformation and failure characteristics of the crustal rocks in the western Yunnan earthquake prediction experimental site, we conducted a triaxial compression experiment on marble produced in the quarry of Dali County, Yunnan Province. Rock samples from the Precambrian Cangshan Group Sec. Cangshan Group and the Paleozoic to Mesozoic fossil strata are fault contact. Rock samples are gray, medium particle size, dense, no macro-joint cracks, basically can be regarded as isotropic. The results of rock sample analysis are shown in Table 1. The results of thermal difference, thermogravimetry and infrared light analysis show that the main mineral composition of rock samples is calcite.