门头沟玄武岩细观矿物组成与宏观力学行为的关联性研究

发布时间：2018-10-22 15:04

【摘要】：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.
[Abstract]:The basalt is considered to be composed of hard minerals and clay minerals, and a method for estimating the average volume of space based on the soft and hard parts is proposed. The estimated elastic modulus is in good agreement with the experimental results. The relationship between mineral composition and macroscopic mechanical properties of basalt at different depths is discussed. The results show that the effect of high strength minerals on the overall mechanical properties is not obvious when the content is low, but only when the content exceeds a certain threshold. For example, the strength of quartz and plagioclase is high, but when the quartz content of Mentougou basalt is lower than 15, the increase of quartz content in a small range does not necessarily lead to a significant increase in rock strength, but when the plagioclase varies between 42.5% and 49.2%, The increase of content leads to an obvious increase in elastic modulus and uniaxial compressive strength. With the increase of buried depth, the content of clay minerals in Mentougou basalt decreases continuously, while the content of soft clay minerals decreases, which leads to the obvious change of macroscopic mechanical behavior of basalt. This is an important reason for the difference of failure mechanism and strength characteristics between deep rock and shallow rock.
【作者单位】：中国矿业大学力学与建筑工程学院;山东科技大学山东省矿山灾害预防控制国家重点实验室培育基地;
【基金】：国家自然科学基金项目(51374215) 霍英东教育基金会第十四届高等院校青年教师基金应用课题(142018) 高等学校学科创新引智111计划(B14006) 山东省矿山灾害预防控制国家重点实验室培育基地(山东科技大学)开放基金(MDPC2012KF03) 北京市科委重大科技成果转化落地培育项目
【分类号】：TU45

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