基于颗粒流方法的隧道围岩力学特性数值模拟研究  

Numerical simulation of mechanical properties of tunnel surrounding rock based on particle flow method

作　　者：刘海峰 LIU Hai-feng(China Railway 19th Bureau Group Third Engineering Co.,Ltd.,Shenyang 110136,Liaoning,China)

机构地区：[1]中铁十九局集团第三工程有限公司,辽宁沈阳110136

出　　处：《资源信息与工程》2021年第1期82-84,88,共4页Resource Information and Engineering

摘　　要：针对加载机制作用下深部岩石的力学特性,本文利用二维颗粒流数值模拟(PFC2D)方法,对阜新海棠山隧道围岩(砂岩)进行了不同加载速率下单轴压缩试验、巴西劈裂试验以及不同围压下的双轴压缩试验,分析了不同实验条件下砂岩的力学响应特征,研究结果表明:同一围压下,随着加载速率的逐渐增大,砂岩的单轴抗压强度、抗拉强度均呈逐渐递增趋势,加载速率由0.5 mm/s增大至2.0 mm/s,单轴抗压强度提升约6.91%,抗拉强度提升约13.53%;同一围压下,随着加载速率的逐渐增大,砂岩的双轴压缩应力-应变曲线变化规律基本一致,试样的峰值强度逐渐增大,在低围压状态时试样呈脆性破坏,在高围压状态时试样呈塑性破坏,且峰后曲线的波动性随加载速率逐渐增强。For mechanical property of the deep rock under the action of loading mechanism,this paper adopted the two-dimensional granular flow numerical simulation method(PFC2D),performed uniaxial compression test with different loading rate,Brazilian split test and biaxial compression test under different confining pressure to the surrounding rock in Fuxin Haitang tunnel surrounding rock,analyzed the mechanical properties of sandstone in different experimental conditions.The results showed that the uniaxial compressive strength and tensile strength of sandstone were on the increase as the loading rate gradually increased under the same confining pressure.The loading rate increased from 0.5 mm/s to 2.0 mm/s,and the uniaxial compressive strength and tensile strength increased by 6.91%and 13.53%respectively.Under the same confining pressure,as loading rate increased gradually,the biaxial compression stress-strain curve of sandstone was basically same,the peak intensity of sample increased gradually,the sample were brittle failure under low confining pressure state,the sample showed plastic damage under high confining pressure,and the curve of volatility with the loading rate after peak gradually enhanced.

关 键 词：岩石力学 砂岩 颗粒流法 双轴试验 

分 类 号：TU91[建筑科学—建筑理论]