摘要
根据相似理论,通过在模拟材料中预制裂隙的方法模拟天然裂隙岩石,在20~800℃的高温下分析高温及裂隙倾角对岩体力学性能的影响,并对比白砂岩实验结果;基于Lemaitre应变等价原理及宏观统计分布理论建立岩石高温受荷损伤方程。研究表明：在400℃之前模拟材料及白砂岩的力学性能随着温度的升高而有所改善,超过400℃后,力学性能开始劣化,由此推定400℃为白砂岩的应力应变曲线阀值;试块的单轴抗压强度及纵波波速随着预制裂隙倾斜角度的增大而减小,超过45°后,随着角度的增大而增大;岩体高温受荷损伤是高温及应力耦合的过程,总损伤相对于高温及荷载损伤之和偏小,裂隙倾斜角度及高温作用对岩石损伤的影响趋势大体和对强度的影响趋势一致。
According to similarity theory, the paper simulated natural fracture rock through prefabricating crack in simulation material, and analyzed the influence of high temperature and fissure angle on mechanical properties of rock mass under temperature of 20 - 800 ℃ , and compared the experimental results of white sandstone ;based on the Lemaitre strain equivalence principle and macroscopic statistical distribution theory, it established the damage equation of high temperature and loading rock mass. The research results show that before 400 ℃, the mechanical properties of simulation materials and white sandstone are improved with the increase of temperature, after 400 ℃, the mechanical performance begin to degradate, 400 ℃ is presumed as the stress - strain curve threshold of white sandstone;the uniaxial compressive strength and longitudinal wave velocity of blocks decrease as the increase of prefabricated crack angle, when the angle is more than 45°,the trend is contrary. The damage of high temperature and loading rock mass is a coupled process of high temperature and stress. The total damages are smaller than the sum of high temperature and load damage. The trend of fracture inclination angle and high temperature effect on rock damage is consistent with the trend of the strength
出处
《水资源与水工程学报》
2016年第2期216-222,共7页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(10872133)
上海市自然科学基金项目(14ZR1428200)
上海理工大学土木工程专业学位研究生培养基地项目
关键词
模拟材料
高温
裂隙倾斜角
单轴压缩
损伤演化模型
simulation material
high temperature
fissure angle
uniaxial compression
damage evolution model
