摘要
基于沉积岩特征，在显微镜下对陆源碎屑岩的成分、碎屑颗粒粒径、胶结作用和胶结类型等进行定量统计，建立了微观结构与宏观力学性质之间的定量关系，认为碎屑岩中随着粒径大于 ０． ０３ ｍｍ（或小于５φ）的碎屑颗粒含量的增加，岩石力学性质“包络线”上的值存在二次明显变化，表现为岩石力学性质跃变。同时，随着φ值的增大（或粒径减少），岩石力学性质包络线上的值逐渐增大到峰值强度和峰值刚度（粒径为２．５φ）。达到峰值后，随着φ值的增大，岩石力学性质逐渐降低，呈现“粒径软化”特性，最后产生残余流动。
On the basis of the statistical analysis of the sedimentary rock characteristics, such as the composition, grain size, cementation and cementation type observed under optical microscope, the quantitative relationship between the microtextures and its mechanical properties is set up. It is shown that there are two obvious changes on the enveloping line of the rock mechanics properties. The jump would appear of the rock mechanics properties with increase of the content of detritus under the condition of grain diameter more than 0.03 mm (or less than 5φ). Futhermore, with the increase of of value (or the decrease of the grain diameter), the value of the enveloping line gradually increases to the peak strength and peak rigidity(with grain diameter of 2.5φ). When the strength passes the peak value, the strength of rock begins to decrease little by little, which behaves as grain diameter softening. At the end, it comes into a state of residual value.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2000年第2期136-139,共4页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金!(59774003)
国家"九.五"攻关项目!(97224-02)
关键词
沉积特征
力学性质
定量分析
岩石成分
岩石结构
sedimentary characteristics, mechanical properties, enveloping line, quantitative analysis
