文档介绍：论文题目:温度-围压作用下岩石力学特性研究
专业:工程力学
硕士生:梁源(签名)
指导教师:张慧梅(签名)
摘要
随着大量寒区工程的进行,为保证寒区工程的安全性,深入研究冻结岩石的力学性
质显得越来越重要。本文以寒区岩体工程为背景,针对冻融循环条件下的受荷岩石,应
用岩石损伤力学理论,研究冻融受荷岩石损伤力学特性,并通过数值计算,对低温环境
下岩石试样压缩过程进行分析。
基于损伤力学基本理论,利用推广后的应变等价原理,引入岩石冻融受荷损伤变量,
在考虑冻融循环和围压的情况下,建立岩石冻融受荷损伤演化方程,推导出模型参数的
表达式,进而得到冻融和围压影响下岩石冻融受荷损伤本构关系。利用常温下岩石三轴
压缩实验数据和冻融条件下岩石单轴压缩实验数据,分别对岩石冻融受荷损伤本构模型
进行验证,并对模型参数进行讨论,证明了模型的合理性。
利用有限元方法,对不同围压和不同温度状况下的岩石试样压缩过程进行数值模
拟,分析围压和温度对岩石力学性质的影响。分别在不考虑冻胀和考虑冻胀的情况下,
分析低温环境岩石试样单轴受力状态下瞬态热力耦合特性,研究热力耦合作用下的岩石
受力特性,并通过对比讨论冻胀对低温岩体力学性质的影响。结果表明,围压和低温均
能提高岩石的承载能力,冻胀对低温岩石应力分布有显著影响。
关键字:岩石力学;损伤变量;冻融循环;围压;热力耦合
研究类型:应用研究
基金项目:国家自然科学基金(11172232);
陕西省自然科学基金(2011JM1003);
陕西省教育厅专项基金(11JK0525)。
Subject : Study on Mechanical Properties of Rock under Temperature
and Confining Pressure
Specialty : Engineering Mechanics
Name : Liang Yuan (Signature)
Instructor : Zhang Huimei (Signature)
ABSTRACT
In order to ensure the safety of cold regions engineering, which is conducting in a large
of number, the further study of mechanical properties of frozen rock is ing more and
more important. Based on the damage mechanical theory of rock, this paper studied the
damage mechanical properties of rock under load and Freeze-thaw cycles coupling in cold
regions, and analyzed the process of rock pression test in the low temperature
environment by simulation.
Based on the basic theory of damage mechanics, using the generalized strain equivalence
principle, the damage variable of rock under load and freeze-thaw cycles coupling was pulled
in, and the damage evolution equation of rock under load and freeze-thaw cycles coupling
was established in the situation considering the freeze-thaw cycles and confining pressure,
then the damage constitutive relation of rock under load and freeze-thaw coupling was
determined by deducing the expression of the model parameters. The damage constitutive
model of rock under load and freeze-thaw cycles was inspected and verified by using the
experiment