层理泥质白云岩各向同性弹性力学试验研究

Experimental study on isotropic elastic mechanics of layered argillaceous dolomite

为了进一步研究层理泥质白云岩各向同性力学性能,对层理角度为0°、30°、45°、60°、90°泥质白云岩开展单轴压缩试验、EDS试验,通过试验验证其具有各向同性,在此基础上建立本构模型研究层理泥质白云岩力学性能。研究结果表明,层理泥质白云岩微观晶体结构以组合、叠聚形式存在,使其由不同晶体结构的各向异性变为定向排列的各向同性;最终基于单轴压缩试验得其各向同性的5个弹性常数,并依靠试验数据进一步研究弹性常数、层理间距、岩体密度等对岩体动力问题的影响,丰富了层理泥质白云岩在隧道围岩稳定性方面的研究。

In order to further study the isotropic mechanical properties of bedding argillaceous dolomite,uniaxial compression test and EDS test were carried out for slicing angle 0°,30°,45°,60°,90°mudstone dolomite.On the basis of this,a constitutive model is established to study the mechanical properties of layered argillaceous dolomite.The results show that the meso-crystal structure of layered argillaceous dolomite exists in the form of combination and aggregation,which makes it change from the anisotropy of different crystal structures to the isotropy of directional arrangement.Finally,five elastic constants of isotropy were obtained based on uniaxial compression test,on the basis of which the influence of property constant,beding spacing and rock mass density on the dynamic prolelem of rock mass was further studied.This work can enrich the study of the stability of layered muddy dolomite in tunnel surrounding rock.