盐岩蠕变特性和本构关系研究  

Study on creep characteristics and constitutive relation of rock salt

作　　者：刘江[1] 杨春和[1] 吴文[1] 高小平[1] 

机构地区：[1]中国科学院岩土力学重点实验室

出　　处：《岩土力学》2006年第8期1267-1271,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.50274065);中国科学院武汉岩土力学研究所领域前沿基础性研究基金(No.Q110205)

摘　　要：对金坛盐岩蠕变规律进行了试验研究,分析了不同应力状态和温度对盐岩蠕变特性的影响,通过试验获取了蠕变曲线和蠕变特征参数。根据其蠕变曲线特征,用黏弹塑性理论建立了盐岩蠕变本构模型。试验结果表明,稳态蠕变率是偏应力和温度的非线性函数关系,并提出盐岩的稳态蠕变本构方程。通过试验数据拟合得到本构方程中的参数,将理论和试验结果进行比较,结果表明两者的吻合性较好。Uniaxial and triaxial creep tests have been performed on rock salt of Jintan Salt Mine on high temperature and high pressure triaxial theological device; the creep characteristics of rock salt are investigated and the effect of stress state and temperature of rock salt are analyzed; and then the creep characteristic curve and parameters are obtained. Based on the character of creep curve of rock salt, a creep constitutive model of rock salt is established by using viscoelasto-plastic theory. Through the test results, it is shown that the steady state creep strain rate is a nonlinear function of diviatoric stress and temperature; a steady state creep constitutive model of rock salt is established. The patameters of constitutive equation are obtained by fitting test data; the theoretic results is proved well by comparison with the experimental results.

关 键 词：盐岩 蠕变试验 温度 本构关系 

分 类 号：O319.56[理学—一般力学与力学基础]