考虑轴向力和渗透力时软化围岩隧道解析

发布时间：2018-06-20 12:55

本文选题：轴向应力 + 渗透力　；参考：《力学学报》2014年05期

【摘要】：为了研究轴向应力和渗透力共同作用下软化围岩的应力与位移的变化及分布规律.基于摩尔--库伦屈服准则及应力--应变软化模型并考虑轴向应力和渗透力的共同作用,将整个塑性区分为有限个同心圆环,以弹塑性交界面处的应力、应变为初始值,并采用微小径向应力增量逐步求出各个圆环上的应力应变及塑性区半径,据此重构了考虑渗透力和轴向力共同作用下软化围岩应力应变特性的逐步求解方法.利用该方法,推导出软化围岩应力应变的解.计算结果表明:在考虑轴向应力作用下,塑性区半径和隧道围岩位移都随着渗透力的增加而有所减小;当轴向应力为最小主应力时,渗透力的影响更为显著.这说明渗透力的存在对于隧道围岩的应力应变分布以及塑性半径和围岩的位移有不可忽略的影响.
[Abstract]:In order to study the variation and distribution of stress and displacement in softening surrounding rock under the combined action of axial stress and permeability. Based on the Mohr-Coulomb yield criterion and the stress-strain softening model and considering the interaction of axial stress and permeability, the whole plasticity is divided into finite concentric rings. The stress and strain at the elastic-plastic interface are taken as the initial values. The stress-strain and plastic zone radius of each ring are obtained by using small radial stress increment, and the stress strain characteristic of softened surrounding rock is reconstructed under the combined action of permeability force and axial force, according to this method, the stress and strain characteristics of softening surrounding rock are solved step by step. By using this method, the stress-strain solution of softening surrounding rock is derived. The results show that the radius of plastic zone and the displacement of surrounding rock of tunnel decrease with the increase of permeability, and the influence of permeability is more obvious when the axial stress is the minimum principal stress. This indicates that the existence of permeability has an important influence on the stress and strain distribution of surrounding rock, plastic radius and displacement of surrounding rock.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51208523)~~
【分类号】：U451.2

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