【作者】 吕宜美；

【导师】 王永岩；

【作者基本信息】 青岛科技大学 ， 工程力学， 2010， 硕士

【摘要】 采掘及国防工程向地下深部的推进过程中,带来了一系列深部岩体力学问题。对工程安全起重要作用的地下水化学腐蚀问题已突出地摆在人们面前,其产生的影响已对生产和安全构成了极大的威胁。因此,化学腐蚀下深部软岩蠕变特性的影响研究具有重要的理论意义和应用价值。蠕变是流变的一种,也是发生流变大变形主要的影响因素之一。因此,软岩工程中,要研究流变大变形,其蠕变性质的研究首当其冲。考虑到砂岩可视为多孔介质,其在化学腐蚀下孔隙度动态变化,本文给出了考虑化学腐蚀和渗流的多孔介质有效应力计算方法,同时,对传统的多孔介质模型进行改进,引入化学腐蚀影响因素,计入溶液PH值和有效应力的影响,给出了化学腐蚀下深部砂岩的蠕变方程。通过化学腐蚀下砂岩单轴蠕变实验,利用Matlab非线性最小二乘估计,对模型进行了验证。结果表明,模型本身的适用性很好。在用模型拟合实验数据的同时,得到了实验数据与模型的拟合曲线和不同PH值不同应力下的蠕变参数。并得出结论:化学腐蚀程度越严重,蠕变量和蠕变速率越大,化学腐蚀的影响程度与所承受载荷有关。利用ANSYS软件对某一工程算例进行了数值模拟计算,可视化地呈现了巷道围岩蠕变现象,并再次验证了实验结论。更多还原

【Abstract】 The advance of underground excavation and national defence construction towards deep part brings a series of problems of deep rock mechanics. Then the problems of ground water chemical corrosion which plays an important role of the engineering security, have been putting in front of us, of which the effect is a great menace to production and security. Therefore, it has the important theory significance and the application value to study on creep of deep soft rock in the effect of chemical corrosion.Creep forms part of rheology and it’s also themain reason of the largede formation. Accordingly if you want tostudy thel arger heologieal deformation,study the creep features first in soft rock engineering. Sandstone can be regarded as porous medium. Its porosity is dynamic. The calculation method of effective stress of porous medium is given in this paper. At the same time, a traditional model of porous medium is improved, and chemical corrosion as a factor is introduced. Taking the effect of PH value and effective stress into account, creep equations of deep sandstone are established under chemical corrosion.The models are veryfied through sandstone uniaxial chemical corrosion creep experiment and using Matlab nonlinear least-squares estimation. The results indicate that the applicability of the models is good. The fitting curves of experimental findings and models and creep parameters of different PH value and stress are obtained at the same time. A conclusion is drawn that with the degree of chemical corrosion increasing, creep deformation and creep velocity increases, and the extent of effect of chemical corrosion is depended on loading.An engineering case is simulated by ANSYS, the phenomenon of creep of tunnel adjacent is esented visually, and the experiment conclusion is verified again.更多还原