摘要
为研究高温对结构面剪切力学性质的影响,开展了高温作用后类岩石结构面的剪切试验,分析了高温作用后,类岩石结构面剪切应力、剪切位移和岩壁抗压强度的变化规律。试验结果表明,随着温度的增加,剪切应力-剪切位移曲线发生明显的变化,其中峰值剪切应力呈现降低的趋势,而剪切位移逐渐增大;并且法向应力的增大对高温引起的热损伤具有一定的抑制作用。根据试验结果,考虑高温对结构面剪切力学性质的影响,计算出Barton-Bandis准则里的结构面岩壁抗压强度(JCS),构建了能够反映高温对JCS影响的关系式,通过对试验曲线的拟合,验证了关系式的正确性。本文研究结果对高温后岩体工程的稳定性评价具有一定的参考作用。
To explore the effect of high temperature on the shear mechanical properties of structural plane,the shear test of artificial specimens at high temperature was carried out.The effects of high temperature on shear stress,shear displacement and joint wall compressive strength were analyzed.The test results show that the shear stress displacement curve changes obviously with the increase of temperature.The peak shear stress shows a decreasing trend,while the shear stress displacement increases obviously.Moreover,the increase of normal stress weakens the thermal damage caused by high temperature to some extent.According to the test results,considering the influence of high temperature on the shear mechanical properties of structural plane,the joint wall compressive strength(JCS)in Barton-Bandis criterion is obtained in reverse.The relationship of rock wall compressive strength of structural plane which can reflect the influence of high temperature is constructed.The correctness of the equation is verified by fitting the test curve.The research results provide some theoretical reference for the stability evaluation of high temperature rock mass engineering.
作者
李婷
姜谙男
张峰瑞
万友生
LI Ting;JIANG Annan;ZHANG Fengrui;WAN Yousheng(Institute of Road and Bridge Engineering,Dalian Maritime University,Dalian 116026,Liaoning,China;Nanchang Railway Transportation Group Co.Ltd,Nanchang 330013,Jiangxi,China)
出处
《实验力学》
CSCD
北大核心
2022年第4期488-496,共9页
Journal of Experimental Mechanics
基金
国家自然科学基金(No.52078093)
辽宁省兴辽英才项目(No.XLYC1905015)资助。
