摘要
针对西南地区二叠系软弱夹层在降雨反复作用下蠕变效应明显等问题,以四川省黄山石灰石矿区炭质泥页岩为研究对象进行渗透压作用下的剪切蠕变试验,得到其剪切蠕变试验曲线,通过分析其蠕变特性以及非线性破环规律,基于传统的西原模型,提出了一种能同时描述炭质泥页岩黏弹塑性特性的非线性蠕变模型,并利用该模型进行剪切蠕变参数辨识,结合FLAC3D数值模拟计算,研究了炭质泥页岩变形破坏特征,对比分析了室内试验结果和数值模拟结果,数值模拟结果证实了室内试验的可靠性以及本构模型和参数选取的合理性。研究结果表明:在渗透压、法向压力以及剪切应力的作用下,炭质泥页岩试样经历了完整的蠕变三阶段;改进的西原模型能够很好地拟合炭质泥页岩蠕变的三个阶段,对加速蠕变阶段的拟合效果也很好;运用FLAC3D软件对室内剪切蠕变试验进行计算得到的数值模拟结果与实际结果相吻合。
Aiming at the obvious creep effect of Permian soft interlayers under repeated rainfall in Southwest China,the shear creep test under osmotic pressure is carried out on the carbonaceous mud shale in the Huangshan limestone mining area in Sichuan Province,and the shear creep test curves are obtained,and by analyzing its creep characteristics and nonlinear breaking law,based on the traditional Nishihara model,a nonlinear creep model that can simultaneously describe the viscoelastic-plastic characteristics of carbonaceous mud shale is proposed,and the model is used to identify the shear creep parameters.Combined with FLAC3D numerical simulation calculation,the deformation and failure characteristics of carbonaceous mud shale are studied,and the indoor test results and numerical simulation results are compared,and the numerical simulation results confirmed the reliability of the indoor test and the rationality of constitutive model and parameter selection.The results show that under the action of osmotic pressure,normal pressure and shear stress,the carbonaceous mud shale specimen undergoes a complete creep stage.The improved Nishihara model can fit the three stages of carbonaceous shale creep well,and the fitting effect on the accelerated creep stage is also very good.The numerical simulation results obtained by using FLAC3D software to calculate the indoor shear creep test are consistent with the actual results.
作者
严珊
胡斌
魏二剑
马利遥
田磊
YAN Shan;HU Bin;WEI Erjian;MA Liyao;TIAN Lei(College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,China)
出处
《中国矿业》
2023年第11期245-252,共8页
China Mining Magazine
基金
国家自然科学基金(联合基金)重点项目资助(编号:U1802243)
国家自然科学基金面上项目资助(编号:41672317)
湖北省技术创新专项(重大项目)资助(编号:2017ACA184)
武科大重大科技项目培育类创新团队(A类)资助(编号:2018TDX01)。
关键词
渗透压
剪切蠕变试验
非线性蠕变模型
数值模拟
osmotic pressure
shear creep test
nonlinear creep model
numerical simulation
