基于单轴压缩试验的绿泥石片岩各向异性  

Anisotropy of Chlorite Schist Based on Uniaxial Compression Test

作　　者：陈懿[1] 周亚军[1] 李志刚 CHEN Yi;ZHOU Ya-jun;LI Zhi-gang(Jiangsu Surveying and Design Institute of Water Resources Co.Ltd.,Yangzhou 225127,China;College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,China)

机构地区：[1]江苏省水利勘测设计研究院有限公司,扬州225127 [2]扬州大学建筑科学与工程学院,扬州225127

出　　处：《科学技术与工程》2020年第9期3721-3725,共5页Science Technology and Engineering

基　　金：国家自然科学基金(41472263);江苏省水利科技项目(2017017)。

摘　　要：为研究绿泥石片岩的各向异性,通过一系列室内试验分析其物质组成、微观结构,单轴压缩条件下宏、微观破坏特征及物理力学参数的变化,并揭示了其物理力学性能及力学行为各向异性的机制。研究结果表明:片理面是影响绿泥石片岩力学性质的弱面,对波速产生较大影响,使得平行片理面方向的波速为垂直片理面方向的8倍;在单轴压缩条件下,当试件片理面水平时,较之直立时更易变形,变形量更大,破坏模式为劈裂-剪切破坏,微观上呈穿晶断裂和沿晶断裂组合特征;当试件片理面直立时,破坏模式为竖向劈裂-张拉破坏,微观上呈沿晶断裂为主,所测得的单轴抗压强度、弹性模量、泊松比等物理力学参数分别为片理面水平时的1.9、3.5、5倍,各向异性十分明显。研究成果可为该类片岩区岩石工程设计与施工提供理论依据。To study the anisotropic properties of chlorite schist in northwest of Hubei Province, laboratory tests were carried out. The mineral composition and microstructure, physical and mechanics parameters, and failure modes of specimens under uniaxial compression were analyzed, and the mechanism of anisotropy was revealed. Results show that, foliation of the chlorite schist was weak, and the wave velocity in the foliation-paralleled direction was 8 times greater than that in the foliation-perpendicular direction. Under the uniaxial compression, the deformation of chlorite schist was easier and stronger in the foliation-paralleled direction in brittle and splitting-shear failure mode, presenting both transgranular and intergranular fracture in microscopy. In the foliation-perpendicular direction, the specimens showed the splitting-tensile failure mode and mainly intergranular fracture in microscopy;and the of uniaxial compressive strength, elastic modulus, Poisson ratio measured were 1.9, 3.5, and 5 times of those in foliation-paralleled direction, respectively, showing very clear anisotropy. The study can provide a theory basis for the design and construction of rock engineering projects in the area of chlorite schist distribution.

关 键 词：绿泥石片岩 单轴压缩试验 力学性质 各向异性 

分 类 号：TU452[建筑科学—岩土工程]