基于岩体蠕变试验的Burgers改进模型

发布时间：2018-04-05 11:17

本文选题：岩体　切入点：蠕变特性　出处：《中南大学学报(自然科学版)》2017年09期

【摘要】：以湖北潘口水电站进水口边坡岩体为研究对象进行室内蠕变试验,得到岩样的应力-应变曲线和相应的力学参数;对本构模型进行分析,提出改进方法。在Mohr-Coulomb准则(M-C准则)基础上引入新的M-C塑性元件,提出Burgers改进蠕变模型。研究结果表明:白云石英片岩和绿泥钠长片岩具有明显的蠕变特性,在不同级别的荷载力加载下,加载应力与应变以比例方式增大;这2种岩体材料同时具有黏塑、瞬塑、瞬弹和黏弹特性,这4种特性随着应力增大也呈增强趋势;这2种岩体材料在饱和状态下蠕变现象更明显;Burgers改进蠕变模型能够对黏弹塑性偏量特征及弹塑性体积进行模拟。
[Abstract]:Taking the intake slope rock mass of Pankou Hydropower Station in Hubei Province as the research object, the stress-strain curve and the corresponding mechanical parameters of the rock samples are obtained, and the constitutive model is analyzed and the improved method is put forward.On the basis of Mohr-Coulomb criterion and M-C criterion, a new M-C plastic element is introduced, and Burgers improved creep model is proposed.The results show that the dolomite schist and the green-mud sodium schist have obvious creep characteristics, the loading stress and strain increase proportionally under different loading forces, and the two kinds of rock mass materials have both viscoplastic and transient plastic properties.The instantaneous and viscoelastic properties show an increasing tendency with the increase of stress, and the creep phenomena of these two kinds of rock mass materials under saturated state are more obvious. The Burgers improved creep model can simulate the characteristics of viscoelastic-plastic deflection and elastoplastic volume.
【作者单位】：中南大学地球科学与信息物理学院;中国电建集团中南勘测设计研究院有限公司地质工程处;长沙理工大学交通运输工程学院;
【基金】：国家自然科学基金资助项目(51508042)~~
【分类号】：TU45

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