摘要
为探究冻融循环影响下不同岩性岩石的物理力学性质的差异化响应,对青砂岩、灰砂岩2种砂岩,白色大理岩、麻粒岩2种变质岩开展冻融循环试验和相关力学试验。研究结果表明:在冻融循环过程中,2种砂岩的质量变化幅度明显高于2种变质岩。相较于青砂岩与麻粒岩,大理岩的单轴压缩强度及弹性模量劣化速率最快。冻融前后青砂岩、大理岩的单轴压缩破坏模式发生明显变化。灰砂岩抗拉强度劣化速率显著低于青砂岩。基于单轴抗压强度、抗拉强度的脆性指数表明冻融作用提高青砂岩的脆性。研究结果可为冻融影响下工程岩体的稳定性与安全性评价提供参考。
In order to explore the differential response of physical and mechanical properties of rocks with different lithological under the influence of freeze-thaw cycle,the freeze-thaw cycle tests and related mechanical tests were carried out on two kinds of sandstones,green sandstone and grey sandstone,and two kinds of metamorphic rocks,white marble and granulite.The results showed that during the process of freeze-thaw cycle,the mass variation amplitudes of two kinds of sandstone were significantly higher than those of two kinds of metamorphic rocks.Compared with green sandstone and granulite,the marble had the fastest degradation rate of uniaxial compressive strength and elastic modulus.The uniaxial compression failure mode of green sandstone and marble changed obviously before and after the freeze-thaw.The degradation rate of tensile strength of grey sandstone was significantly lower than that of green sandstone.The brittleness index based on the uniaxial compressive strength and tensile strength presented that the freeze-thaw effect improved the brittleness of green sandstone.The results could be useful on the evaluation of stability and safety of engineering rock mass exposed to freeze-thaw cycles.
作者
卫梦希
李庆文
郭红臣
李鑫
WEI Mengxi;LI Qingwen;GUO Hongchen;LI Xin(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2023年第1期41-46,共6页
Journal of Safety Science and Technology
基金
国家自然科学基金委与山东联合基金重点项目(U1806209)。
关键词
冻融循环
单轴压缩强度
破坏模式
巴西圆盘抗拉强度
freeze-thaw cycle
uniaxial compressive strength
failure mode
Brazilian disk tensile strength
