高温条件下页岩力学特性试验及数值模拟研究
Experimental and Numerical Simulations of the Mechanical Properties of Shale Under High Temperature
孟祥瑞 1邬忠虎1
作者信息
- 1. 贵州大学 土木工程学院,贵阳 550025
- 折叠
摘要
以黔北地区下寒武统牛蹄塘组黑色页岩为研究对象,采用101-1BS电热鼓风干燥箱模拟深部的高温环境,并利用RMT-301加载系统试验机开展不同加热温度下的页岩单轴压缩试验.采用岩石真实破裂分析系统RF-PA2D—Thermal建立数值模型,模拟页岩在相同温度下的破裂过程.结果表明,温度会显著的影响页岩的抗压强度,从常温开始,随着温度的升高,页岩的最大声发射能量、脆性、峰值强度不断升高,在120℃达到最高值,之后逐渐降低.200℃的页岩试样在温度处理后产生宏观裂纹,并在单轴压缩过程中扩展、贯穿,是导致其强度劣化严重的重要原因.
Abstract
The black shale samples of Niutitang Formation of the Lower Cambrian in the northern Guizhou region were tested under a 101-1BS electric blast drying oven simulated high-temperature environment by the RMT-301 loading system.The uni-axial compression tests were performed on shale samples at different heating temperatures.A numerical model using the real rock fracture analysis system RFPA2D Thermal was established to simulate the fracture process of the shale at the same tem-perature.The results indicate that the temperature significantly affects the compressive strength of the shale sample.Starting from the room temperature,as the temperature increases,the maximum acoustic energy,the brittleness,and the peak intensity of the shale samples continue to increase,reaching their highest value at 120 ℃.Afterwards,as the temperature increases,these parameters decrease.The occurrence of the macroscopic cracks in shale samples at 200 ℃ after the temperature treat-ment,which propagate and penetrate during the uniaxial compression,is an important reason for their severe strength degrada-tion.
关键词
高温劣化/页岩/力学性质/单轴压缩试验/数值模拟Key words
High Temperature Degradation/Shale/Mechanical Properties/Uniaxial Compression Tests/Numerical Simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据