摘要
为研究辽西花岗岩的工程力学性能,采用TAW-2000电液伺服岩石三轴仪,对辽西花岗岩试样分别进行了围压为5 MPa、10 MPa和20 MPa条件下的三轴蠕变实验.基于不同围压条件下的三轴蠕变试验数据,绘制辽西花岗岩的三轴蠕变曲线、等时应力应变曲线和蠕变速率曲线,分析试样的蠕变起始应力和长期强度.研究结果表明：等时应力应变与蠕变速率相结合的方法能更好地描述蠕变的发展过程、变形特征和蠕变阶段.随着围压的增加,蠕变速率的波动范围减小,加速蠕变段的发展过程更为平稳,蠕变破坏经历的时间也更长.实验数据的统计分析结果表明：试样的蠕变长期强度阈值为（0.7~0.8）（σ1-σ3）.
In order to research on the engineering mechanical properties of the Mesozoic granite in West Region of Liaoning province, by use of the TAW-2000 Electro-hydraulic servo rock triaxial apparatus, experimental study is carried out on the creep properties of granite specimens at confining pressure of 5MPa, 10MPa and 20MPa respectively. Based on triaxial creep test data under different confining pressure, creep curves, equal time stress-strain curve and creep rate curve are drawn. The creep nitial stress and long-term strength are analyzed. Research results show that the method of combining equal time stress-strain with creep rate can better describe development process, deformation behaviour and creep stage. With increase of confining pressures, the fluctuation range of creep rate decrease, and development process at accelerating creep stage is smooth, and creep rupture time is longer. Results of statistic analysis show that the threshold value of long-term strength is （0.7-0.8）（σ1-σ3）.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2014年第10期1342-1346,共5页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金资助项目(51274109)
关键词
花岗岩
三轴蠕变
时效性
变性特征
长时强度
granite
triaxial creelS
creep properties
deformation feature
long term strength
