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把玄武岩视为硬质矿物和黏土质矿物两部分组成,提出了基于软-硬两部分的空间体积平均估算方法,估算的弹性模量与实验结果较为吻合.探讨了不同深度玄武岩矿物组成与宏观力学性质的关系,研究表明:高强度的矿物当含量较低时对整体力学性质的影响并不明显,只有含量超过某一门槛值后才有较大影响.如石英和斜长石强度都较高,但门头沟玄武岩石英含量低于15%时,石英含量在小范围的增加并不一定会导致岩石强度出现明显的提升;而当斜长石在42.5%—49.2%之间发生变化时,含量增加导致弹性模量和单轴抗压强度有明显增加的趋势.随着埋深增加,门头沟玄武岩中黏土质矿物含量在不断减小,而软弱黏土质矿物含量的减少,明显导致玄武岩的宏观力学行为的显著变化,这是深部岩石与浅部岩石的破坏机理及强度特性存在差异的一个重要原因.
Basalt is considered as two parts of hard mineral and clay mineral, and the method of average spatial volume estimation based on soft and hard parts is proposed. The estimated elastic modulus is in good agreement with the experimental results. The mineral composition and macroscopic Mechanical properties, the study shows that: when the content of high-strength minerals lower the overall mechanical properties of the impact is not obvious, only the content exceeds a certain threshold has a greater impact, such as the strength of quartz and plagioclase are more However, when the quartz content of Mentougou basalts is less than 15%, the small increase of quartz content does not necessarily lead to a significant increase of rock strength. When the content of plagioclase varies from 42.5% to 49.2% The elastic modulus and the uniaxial compressive strength increase obviously.With the increase of burial depth, the content of clay minerals in the Mentougou basalt decreases, while the decrease of the content of the soft clay minerals obviously leads to the macroscopic mechanics of the basalt Significant changes in behavior, which is a deep rock and shallow rock failure mechanism and strength characteristics of an important difference.