摘要
在冻土地区,当岩石孔隙度较高时,冻结引起的岩石强度明显增加,因此有必要对其机理进行深入研究。通过研究孔隙水对低温条件下饱水岩石力学性质的影响,在-170°C至室温范围内,对凝灰岩和砂岩进行了单轴压缩试验和间接拉伸试验,并结合扫描电子显微镜试验观察岩石的微观结构。研究发现并总结了孔隙水对岩石低温强化机理的影响规律。岩石强度的强化被认为是由孔隙水冻结引起的荷载分布效应和孔隙水冻结后引起的冰强度增加之间的相互作用引起的。本研究将宏观岩石力学与微观岩体结构相结合,为冻土地区岩石力学研究提供了一定的参考。
In frozen soil area,when the porosity of rocks is high,the strength of rocks caused by freezing increases obviously,so it is necessary to further study the mechanism.In this paper,the effect of pore water on the mechanical properties of saturated rocks at low temperature has been studied.Uniaxial compression tests and indirect tensile tests have been carried out on tuff and sandstone in the range of-170°C to room temperature,and the microscopic structures of rocks have been observed by scanning electron microscopy.The effect of pore water on the strengthening mechanism of rock at low temperature is found and summarized.The strengthening of rock strength is thought to be caused by the interaction between the loading distribution effect caused by the freezing of pore water and the increase in ice strength caused by the freezing of pore water.This study combines macroscopic rock mechanics with microscopic rock mass structure,which provides a certain reference for the study of rock mechanics in frozen soil area.
作者
王兵强
WANG Bingqiang(Ecological Environment Technology Co.,Ltd.,China Coal Technology and Engineering Group Corp.,Tianjin 300461,China;China Coal Technology&Engineering Xinrong Innovation Development Co.,Ltd.,Jining Shandong 272000,China)
出处
《有色金属（矿山部分）》
2023年第2期149-155,共7页
NONFERROUS METALS(Mining Section）
基金
中国煤炭科工集团有限公司科技创新创业资金专项重点项目(2018-2-ZD007)
中煤科工生态环境科技有限公司科技创新基金(0206KGST-0007)。
关键词
凝灰岩
砂岩
低温
单轴抗压强度
间接拉伸强度
孔隙水
tuff
sandstone
low temperature
uniaxial compressive strength
indirect tensile strength
pore water
