泥岩蠕变损伤试验研究  

EXPERIMENTAL STUDY OF CREEP DAMAGE OF MUDSTONE

作　　者：刘保国[1] 崔少东[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《岩石力学与工程学报》2010年第10期2127-2133,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家高新技术研究发展计划(863)项目(2007AA11Z109)

摘　　要：在岩石蠕变过程中,施加载荷超过某个应力水平后,其强度会随着时间和应力逐渐降低,这种损伤规律可以定量地用岩石基本力学参数如弹性模量E、黏聚力c和内摩擦角?降低的多少来反映。对宝鸡市秦源煤矿泥岩进行8个不同应力水平、3个不同时间段蠕变试验,采用单试件法测得泥岩蠕变过程中各力学参数E,c,?的变化值,对试验数据进行分析,建立该泥岩E,c,?随应力水平、长期强度及时间的耦合函数关系,它们之间呈指数衰减变化。分析耦合函数中各个系数的特点,得到泥岩力学参数损伤规律的通用表达式,式中各参数物理意义明确,测试简单。其研究结果为建立岩石损伤流变本构模型奠定基础。The rock strength gradually degraded with time and stress if applied load exceeds a certain yield stress level in creep process;and this damage law could be quantified with the reduction in the basic mechanical parameters of rock,i.e.elastic modulus E,cohesion c and internal friction angle ？.Based on the creep experiments of mudstone obtained from Qinyuan coal mine in Baoji under conditions of eight different stress levels and three different times,the variations of mechanical parameters E,c and ？ were measured in the process of mudstone creep by using single specimen method.Then,the coupling functions,that the mechanical parameters E,c and ？ decayed exponentially with increases in stress level,long-time strength and time,were established through test data.Moreover,the mudstone common expression of damage law of mechanical parameters was obtained by analyzing the characteristics of coefficients in coupling functions,in which the parameters had clear physical meanings and simple testing methods.This study could provide the foundation for further establishment of non-stationary rheological constitutive model.

关 键 词：岩石力学 泥岩 蠕变损伤 损伤阈值 非定常参数 力学参数 

分 类 号：TU45[建筑科学—岩土工程]