基于率效应的岩石材料次加载面动态模型在岩体工程中的初步应用

发布时间：2018-03-27 18:11

本文选题：岩石力学　切入点：次加载面　出处：《岩石力学与工程学报》2017年10期

【摘要】：为较准确反映岩体工程在地震荷载下的响应,结合Drucker-Prager屈服准则和次加载面理论,初步构建基于Drucker-Prager准则的次加载面应力路径模型,在此基础上,除计算弹性模量的率效应之外,还在Drucker-Prager准则上考虑强度的率效应,提出岩石材料的动态模型,并把该模型运用到滇中引水香炉山隧洞中。计算结果表明,相对于Drucker-Prager准则,应力路径模型能较好地描述玄武岩在循环荷载下体现的曼辛效应和棘轮效应,由于没有考虑率效应,表现出应力应变曲线的斜率没有试验曲线大,且累计应变也比试验曲线大;在岩石循环加卸载过程中,动态模型得出的模量上比次加载面应力路径模型模拟的要大,同时变形量也较次加载面应力路径模型要小,因此该模型能较好地反映岩石的动态力学性质和变形性质;相比于Drucker-Prager准则下,采用动态模型得出隧洞的左侧监测点和右侧监测点的瞬时相对变形峰值增大了0.67 cm,同样底部和顶部以及左右两侧的永久相对变形也分别增大了0.19和0.77 cm,说明动态模型可以较好地反映围岩残余大变形;岩石动态模型相对于Drucker-Prager准则和线弹性本构,更具有滤掉高频的功能。说明该模型能很好地运用到岩石动力学中,同时也为准确分析岩体工程在地震作用下的响应奠定了一个很好的基础。
[Abstract]:In order to accurately reflect the response of rock mass engineering under earthquake load, combined with Drucker-Prager yield criterion and sub-loading plane theory, the stress path model of sub-loading plane based on Drucker-Prager criterion is constructed preliminarily. On this basis, the rate effect of elastic modulus is calculated. Considering the rate effect of strength on the basis of Drucker-Prager criterion, a dynamic model of rock materials is proposed and applied to the Xiangushan tunnel in central Yunnan. The calculation results show that the model is relative to the Drucker-Prager criterion. The stress path model can well describe the Mansin effect and ratchet effect of basalt under cyclic loading. The slope of the stress-strain curve is not as large as the experimental curve because the rate-effect is not taken into account. In the process of cyclic loading and unloading of rock, the modulus of dynamic model is larger than that of the model of secondary loading plane stress path, and the amount of deformation is smaller than that of secondary loading plane stress path model. Therefore, the model can better reflect the dynamic mechanical properties and deformation properties of rock, compared with the Drucker-Prager criterion, The instantaneous relative deformation peak of the left and right monitoring points of the tunnel is increased by 0.67 cm, and the permanent relative deformation of the bottom and the top and the left and right sides of the tunnel is also increased by 0.19 cm and 0.77 cm, respectively, by using the dynamic model. The model can well reflect the large residual deformation of surrounding rock. Compared with Drucker-Prager criterion and linear elastic constitutive model, rock dynamic model has the function of filtering out high frequency, which shows that the model can be applied to rock dynamics. It also lays a good foundation for accurately analyzing the response of rock mass engineering under earthquake.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;武汉科技大学城市学院;
【基金】：国家重点基础研究发展计划(973)项目(2015CB057905) 云南联合基金重点项目(U1402231)~~
【分类号】：TU45

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