防灾减灾工程学报2017，Vol.37Issue(3)：435-441,7.DOI:10.13409/j.cnki.jdpme.2017.03.015
花岗岩非定常蠕变及其参数确定
Study on Non-stationary Creep and Parameter Determination of Granite
摘要
Abstract
The long-term stability of rock mass engineering in deep stratum rock engineering are closely related to the aging deformation characteristics.Hard rock under the conditions of high geo-stresses presents obviously rheological property.Triaxial rheological tests under different stress paths were carried out on TAW-2000 rock machine.By using the Drucker-Prager yield function we introduce the strength parameters C,φ value to the Nishihara model one-dimensional creep equation,derived three-dimensional creep equation to describe the creep process of granite,and analyze the change law of deformation parameters of Poisson's ratio and strength parameters C and φ.According to the triaxial rheological tests results,the rheological parameters of different confining pressures are obtained by nonlinear least square,and according to the distribution law of the parameters we get the relationship between rheological parameters and stress and time.Finally,the model can be used to study the creep properties of granite.The results show that the model can closely reflect the creep characteristics of the rheological parameters of granite and the weakening of rheological parameters with stress and time,and the results provide new research ideas and research methods for the long-term stability of rock mass engineering in deep stratum rock engineering.关键词
流变参数/长期强度/屈服条件/最小二乘法Key words
rheological parameters/long-term strength/yield criterion/least square分类
建筑与水利引用本文复制引用
张树光,刘文博,王有涛..花岗岩非定常蠕变及其参数确定[J].防灾减灾工程学报,2017,37(3):435-441,7.基金项目
国家自然科学基金项目(51274109)资助 （51274109）
