高温和酸性环境作用下砂岩的能量演化规律与破坏特征研究
Energy evolution and failure characteristics of sandstone under high temperature and acidic solutions
张平 1吴斐 1刘戎 1隆能增 1任松 1田时锋 1陈征 1陈结1
作者信息
- 1. State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;College of Resources and Safety Engineering,Chongqing University,Chongqing 400044,China
- 折叠
摘要
砂岩广泛分布于中国山岭地区,隧道经常修建于山岭砂岩地层中,在隧道施工和运营过程中,隧道围岩容易受到高温和酸性溶液的共同影响.本文通过开展单轴压缩试验和计算机断层扫描试验,研究了高温和酸性溶液作用下砂岩的能量演化规律和破坏特征,分析了不同条件下砂岩的抗压强度、弹性应变能密度、耗散能密度、破坏模式及裂隙分布特征.结果表明,高温和酸性溶液对砂岩的能量分布和破坏模式有显著影响,且在不同阶段对砂岩的破坏模式和裂隙分布特征的影响各有差异,高温对砂岩能量分布和破坏模式的影响比酸性溶液对其影响更为明显;此外,砂岩的弹性应变能及耗散能与破坏特征呈明显的线性关系.本研究可以为复杂高温条件下隧道设计及施工和相关隧道工程的稳定性提供理论依据.
Abstract
Sandstone is commonly found in mountainous regions of China,and the mountain tunnels are often built in sandstone strata.The tunnel surrounding rocks often suffer from elevated temperature and acidic solutions during tunnel construction and operation.In this study,the energy evolution and failure characteristics of sandstones under elevated temperature and acidic solutions were investigated by observing the compressive strength,elastic deformation energy density,dissipative energy density,failure mode,and fracture distribution characteristics of sandstone through uniaxial compression tests and computed tomography scanning.The findings indicate that elevated temperature and acidic solutions had a significant impact on the energy distribution and failure mode of sandstone,and their effects on the failure mode and fracture distribution characteristics of sandstone varied at different stages.The influence of elevated temperature on the energy distribution and failure mode of sandstone was more pronounced compared to that of the acidic solution.Furthermore,the elastic deformation energy density and dissipative energy density of sandstone showed a close linear relationship with failure characteristics.These conclusions could provide a theoretical significance for the design and construction of rock structures under complex high-temperature conditions,and associated tunnel projects.
关键词
高温/酸性溶液/砂岩/能量特征/破坏模式Key words
high temperature/acidic solution/sandstone/energy characteristics/failure mode引用本文复制引用
基金项目
National Natural Science Foundation of China(52074048)
State Key Laboratory of Coal Mine Disaster Dynamics and Control,China(2011DA105287-MS202122)
Chongqing Natural Science Foundation,China(CSTB2022NSCQ-MSX0914)
出版年
2023
NETL
NSTL
维普
万方数据