摘要
受区域变质及后期岩浆活动影响,雅江木灰地区变质砂岩岩组主要岩性表现为千枚岩、片岩、片麻岩,片柱状矿物呈定向构造具有典型的各向异性特征。根据岩石薄片鉴定及单轴抗压实验,对岩石各向异性及对应强度特征进行研究,得到如下认识:该地区区域低温变质作用形成的变质砂岩经后期岩浆侵入接触变质作用,进一步变质为千枚岩、片岩、片麻岩,矿物成分为石英、长石、辉石、角闪石、云母;受片柱状矿物含量影响,岩石平行面理和垂直面理单轴抗压强度相差较大,各性异性较强;考虑片状矿物影响系数、柱状矿物影响系数、改造作用系数,提出了各向异性系数计算公式。所得结果对于认识片状组构岩石强度的各向异性和岩石强度参数取值具有一定指导意义。
Affected by regional metamorphism and later magmatic activity,the metamorphic sandstone group in the Muhui area of Yajiang is mainly lithologic,phyllite,schist and gneiss,and the schistose-column minerals are oriented and have typical anisotropic characteristics.In this paper,the anisotropy and corresponding strength characteristics of rocks are studied based on thin section identification and uniaxial compression test.The results show that the metamorphic sandstone formed by low temperature metamorphism in this area,then further metamorphized into phyllite,schist and gneiss by late magmatic intrusion contact metamorphism.The mineral composition is quartz,feldspar,pyroxene,hornblende and mica.Affected by the content of schistose and columnar minerals,the uniaxial compressive strength of the rock is different from that of the vertical foliation,and the anisotropy is strong.Considering the influence coefficient of schistose mineral,columnar mineral and reforming effect,the calculation formula of anisotropy coefficient is presented.The results have some guiding significance for understanding the anisotropy of the strength of sheet fabric rock and the value of rock strength parameters.
作者
时斌
赵建军
王运生
肖华波
刘豪放
唐涛
冯卓
SHI Bin;ZHAO Jianjun;WANG Yunsheng;XIAO Huabo;LIU Haofang;TANG Tao;FENG Zhuo(State Key Laboratory of Geological Hazard Prevention and Geological Environment Protection,Chengdu University of Technology,Chengdu 610059;Power China Chengdu Survey,Design and Research Institute Co.,Ltd.,Chengdu 610072)
出处
《四川地质学报》
2024年第1期73-79,共7页
Acta Geologica Sichuan
基金
中国电建集团科技项目(DJ-ZDXM-2019-3,DJ-ZDXM-2020-3)。
关键词
片状组构岩石
岩石学特征
各向异性
单轴压缩
相关性分析
schistose fabric rock
petrological characteristics
anisotropy
uniaxial compression
correlation analysis
