摘要
寒区边坡的岩体在冻融循环作用下,力学性能不断劣化,威胁工程边坡的稳定性。本文以G318线巴塘段内某花岗岩岩质高边坡为研究对象,开展了不同含水率花岗岩经不同冻融次数后的单轴压缩试验,分析了含水率及冻融循环次数对花岗岩强度的损伤特征。结果表明:花岗岩单轴抗压强度随含水率及冻融循环次数的增加均呈非线性衰减;基于含水率及冻融次数建立的花岗岩抗压强度预测模型有较高的准确性;花岗岩冻融损伤因子与含水率和冻融循环次数为非线性正相关关系。该成果可为寒区花岗岩边坡的稳定性及相关岩石力学性质的研究提供参考。
Under the action of freeze-thaw cycles,the mechanical properties of the rock mass of the slope in the cold region are continuously degraded,which threatens the stability of the engineering slope.In order to explore the mechanical properties and damage characteristics of granite under the action of freeze-thaw cycles,uniaxial compression tests of granite with different water contents after different freeze-thaw cycles were carried out,and the damage characteristics of water content and freeze-thaw cycles on the strength of granite were explored.The results show that the uniaxial compressive strength of granite exhibited nonlinear attenuation with the increase of water content and the number of freeze-thaw cycles;the prediction model of granite compressive strength based on the internal relationship between water content and freeze-thaw action had a higher performance;granite freeze-thaw damage factor had a nonlinear positive correlation with water content and freeze-thaw cycles.The results can provide reference for the research on the stability of granite slopes in cold regions and related rock mechanical properties.
作者
张安琪
袁磊
舒中潘
张军
周飞
ZHANG Anqi;YUAN Lei;SHU Zhongpan;ZHANG Jun;ZHOU Fei(China Railway Eryuan Engineering Group.Co.,Ltd.,Chengdu 610031,Sichuan,China;Transportation Bureau of Aba Tibetan and Qiang Autonomous Prefecture,Aba 624000,Sichuan,China;Sichuan Institute of Geological Engineering Investigation Group.Co.,Ltd.,Chengdu 610072,Sichuan,China)
出处
《资源信息与工程》
2022年第5期64-68,共5页
Resource Information and Engineering
关键词
花岗岩
含水率
冻融循环
单轴抗压强度
强度损伤
granite
water content
freeze-thaw cycles
uniaxial compressive strength
strength damage
