【作者】 罗帅；

【导师】 王永岩；

【作者基本信息】 青岛科技大学 ， 机械制造及自动化， 2009， 硕士

【摘要】 愈来愈多的工程(如水电、矿山、核废料埋藏及溶质运移等)都建设在岩体之上或岩体之中,而对工程安全起重要作用的地下水流问题就突出地摆在人们的面前。在地下深处的岩体,渗流的作用使得岩体的结构和力学性能恶化,给地下工程的安全带来了极大的威胁,因此,渗流作用下软岩力学行为的研究具有重要的理论意义和应用价值。本文从质量守恒定律、线动量平衡原理和能量守恒定律三个普遍原理出发,根据质量守恒方程、线动量平衡方程(运动方程)和能量守恒方程这三个基本方程以及相应的渗流定解边界条件推导了完整的饱和多孔介质单相流动的流固耦合数学模型。在对前人流变模型理论研究基础上,建立了能反映荷载水平影响又能描述加速蠕变的流变模型,同时,对传统的多孔介质模型进行改进,引入渗流因素,建立了考虑渗流的多孔介质流变模型,应用到软岩中,得到考虑渗流的深部软岩流变模型。通过单轴渗流蠕变试验得到渗流对软岩蠕变特性的部分影响规律,并进一步得出软岩承载能力和弹性模量都随着渗流强度的增加而降低,瞬时弹性变形量和极限蠕变变形量随着渗流强度的增加而增大的结论。用ANSYS软件对某一工程算例进行数值模拟,可视化地呈现了渗流下隧道围岩底鼓等现象,并且验证了试验的部分结论。更多还原

【Abstract】 More and more engineering (such as water-electrolyte engineering, mine, nucleus flotsam and solute moving) are build on or in rock mass, then the problems of ground water which plays an important role of the engineering security, are putting in front of us. In deep underground rock mass, the rock configuration and mechanics performance are deterioratng form seepage flow so that the safe work is threated seriously. Therefore, it has the important theory significance and the application value to study on mechanical behavior of soft rock in the effect of seepage flow.This article is based on three universal principles, the law of conservation of mass, the line momentum balance principle and the law of conservation of energy. According to three fundamental equations, conservation equation of mass, line momentum balance equation (equation of motion) and energy-conservation equation as well as corresponding seepage fix answer of boundary condition deduced an intergrated mathematical model of fluid-structure coupling of one-phase fluid flowing in porous media of creep deformation.In base of theory research to the rheological model of the predecessor, building a rheological model which not only to illustrate the influence of horizontal loading, but also to show the creep deformation of accelerating phase, at the same time, the traditional model of porous medium was to be improved, and the factor of seepage flow was to be draw into, a model of porous medium that considering factor of seepage was to be built, which has been had application in soft rock, at last we got the creep model of soft rock in deep part of underground that considering the seepage flow.By means of homotaxial experiments of creep that considering seepage flow, the discipline of seepage flow effecting on characteristic of creep of soft rock was got, and further obtains the conclusion that the soft rock bearing capacity and the elasticity coefficient all reduce along with the flow intensity increasing, the instantaneous elastic deformation and the limit of creep deformation increases along with the flow intensity increasing.The example of engineering was simulated by ANSYS, the bottom drum phenomenon was presented visually, the conclusion of assay was verified again.更多还原