不同正应力下的千枚岩非线性蠕变损伤西原模型  

Non-linear Creep Damage Nishihara Model for Phyllite under Different Stresses

作　　者：王猛[1] 陈喜峰 李俊莹 崔德山[2] WANG Meng;CHEN Xifeng;LI Junying;CUI Deshan(CCCC Second Highway Consultants Co.,Ltd.,Wuhan 430058,China;China University of Geosciences(Wuhan)Engineering Faculty,Wuhan 430074,China)

机构地区：[1]中交第二公路勘察设计研究院有限公司,武汉430058 [2]中国地质大学(武汉)工程学院,武汉430074

出　　处：《路基工程》2024年第6期34-41,共8页Subgrade Engineering

基　　金：国家自然科学基金资助项目(41772304)。

摘　　要：以某矿山双桥山群千枚岩为研究对象,开展不同正应力作用下的千枚岩蠕变特性及理论模型研究。结果表明:剪切模量等力学参数具有明显的时效性,随着时间的增加,剪切模量迅速减小后趋于稳定,且在时间恒定的情况下,正应力较大,减小趋势相对较小。考虑岩石内部发生的蠕变损伤,引入一个随正应力和时间变化的损伤变量建立非线性蠕变损伤西原模型,在此基础上引入一个带有应变触发的非线性黏壶元件,推导出改进西原模型的蠕变方程。将模型方程与试验数据拟合进行参数辨识及对比分析,表明该模型在表征不同正应力下千枚岩蠕变各阶段的变形特征上是合理可行的。With phyllite of Shuangqiaoshan Group in a mine as the research object,this paper studied creep characteristics and theoretical model of phyllite under different normal stresses.The result shows that,mechanical parameters such as shear modulus have obvious timeliness.With the increase of time,the shear modulus decreases rapidly and tends to be stable.Furthermore,under the premise of constant time,the normal stress is large and the decreasing trend is relatively small.Considering the creep damage developed in rock,a damage variable varying with normal stress and time is introduced to build a non-linear creep damage Nishihara model.On this basis,a non-linear dashpot element with strain trigger is adopted to derive the creep equation of the improved Nishihara model.The model equation is fitted with experimental data to carry out parameter identification and comparative analysis,which manifests that the model is reasonable and feasible in characterizing the deformation characteristics of phyllite creep at different stages under different normal stresses.

关 键 词：千枚岩 正应力 蠕变损伤 西原模型 蠕变特征 

分 类 号：TD12[矿业工程—矿山地质测量]