摘要
为研究不同自然条件下边坡岩石的动态力学性质受冻融循环的影响,对冻融处理后的寒区边坡大理岩在干燥、饱水和冻结条件下进行了一系列动态压缩试验。试验结果表明,相同的冻融循环次数和相同的冲击气压下,常温水对岩石有软化作用,低温冻结对岩石有强化作用,随着冻融循环次数增加,岩样状态对岩石强度的影响逐渐减弱,两种应力因子逐渐接近1;冻融循环对岩样动态强度的劣化作用集中在冻融前期,冻融循环后期岩样动态强度变化不大;随着冻融循环次数增加,岩样动态强度的应变率效应逐渐减弱,且冻融循环对应变率效应的弱化作用也集中在冻融前期。
In order to study the influence of freeze-thaw cycle on the dynamic mechanical properties of slope rocks under different natural conditions,a series of dynamic compression tests were carried out on the marble of the slope in cold region after freeze-thaw treatment under dry,saturated and frozen conditions.The test results are concluded as follows.Firstly,under the same freeze-thaw cycle times and the same impact pressure,the water at normal temperature has a softening effect on the rock,and low temperature freezing can strengthen the rock.With the increase of freeze-thaw cycle times,the influence of rock sample state on rock strength gradually weakens,and the two stress factors gradually approach 1.Secondly,the degradation effect of freeze-thaw cycle on the dynamic strength of rock samples is concentrated in the early stage of freeze-thaw,while the dynamic strength of rock samples varies little in the late stage of freeze-thaw cycle.Thirdly,with the increase of freeze-thaw cycles,the strain rate effect of dynamic strength of rock samples gradually weakens,and the weakening effect of freeze-thaw cycles on strain rate effect is also concentrated in the early stage of freeze-thaw.
作者
尹彦波
YIN Yanbo(Changsha Institute of Mining Research Co.,Ltd.,Changsha,Hunan 410012,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第8期139-145,共7页
Mining Research and Development
基金
国家自然科学基金项目(51774323)
湖南省自然科学资助基金项目(2020JJ4704)。
