层状软岩三轴压缩试验数值模拟研究  

Numerical Simulation Study on Triaxial Compression Test of Layered Soft Rock

作　　者：王宗学 WANG Zongxue(Ji'nan Design Institute,China Railway Engineering Design and Consulting Group Co.,Ltd.,Ji'nan 250022,China)

机构地区：[1]中铁工程设计咨询集团有限公司济南设计院,济南250022

出　　处：《铁道勘察》2025年第1期46-51,共6页Railway Investigation and Surveying

摘　　要：为探究复杂地质条件下层状软岩隧道围岩力学特性,采用数值模拟的方法对室内三轴压缩力学试验结果进行补充、验证,以探明层状软岩不均匀变形等问题。本研究中三轴压缩数值模拟试验采用遍布节理本构模型,充分模拟层理弱面对岩石强度的削弱作用,采用1∶1完全对称模型,岩石基体参数和节理强度参数主要参照千枚岩室内三轴压缩试验数据以及相关研究,设置91种工况充分模拟自然界岩体0°~90°的层理角度,并记录不同层理角度的三轴抗压强度。研究结果表明,岩石三轴抗压强度各向异性曲线呈“U”形,10,20,30 MPa下强度各向异性曲线类似,层理倾角20°~82°范围内抗压强度先减小后增大,层理倾角50°时岩石三轴抗压强度最小;岩石应力除层理倾角0°和90°外均关于原点不对称分布。岩石三轴抗压强度力学试验实测值与数值模拟值接近,印证室内力学试验参数的正确性,弥补室内力学试验工况数量的不足。In order to explore the mechanical characteristics of the surrounding rock of layered soft rock tunnels under complex geological conditions,numerical simulation methods were used to supplement and verify the results of indoor triaxial compression mechanical tests,in order to explore issues such as uneven deformation of layered soft rock.In this study,the triaxial compression numerical simulation experiment used a universal joint constitutive model to fully simulate the weakening effect of weak bedding planes on rock strength.A 1∶1 fully symmetric model was used,and the rock matrix parameters and joint strength parameters were mainly based on indoor triaxial compression test data of phyllite and related research papers.91 working conditions were set to fully simulate the bedding angle of natural rock masses at 0~90°,and the triaxial compressive strength of different bedding angles was recorded.The research results show that,the anisotropic curve of rock triaxial compressive strength shows a“U”shape feature,and the strength anisotropy curve is similar at 10 MPa,20 MPa,and 30 MPa.The compressive strength first decreases and then increases within the range of bedding angle of 20°~82°,and the rock triaxial compressive strength is the smallest at bedding angle of 50°.The rock stress,except for the bedding dip angle of 0°and 90°,is asymmetric distribution about the origin.The measured values of rock triaxial compressive strength mechanical tests are close to the numerical simulation values,confirming the correctness of indoor mechanical test parameters and making up for the shortage of indoor mechanical test conditions.

关 键 词：公路隧道 层状软岩隧道 三轴压缩试验 数值模拟 

分 类 号：TU458[建筑科学—岩土工程] U451[建筑科学—土工工程]