温度、压力、水作用下软岩流变规律的研究

发布时间：2018-05-27 16:20

本文选题：软岩 + 多场耦合　；参考：《青岛科技大学》2013年硕士论文

【摘要】：如今地下工程的应用范围之广、规模之大、埋深之深以及向深部推进速度之快,已非昔日可比。随着浅部资源的逐渐减少,地下矿物资源开采深度的增加和铁路隧道等的建设,在地下岩石工程上遇到了越来越多的工程软岩,工程软岩是指在工程力作用下能产生显著塑性变形的工程岩体。由于软岩具有可塑性、膨胀性、崩解性、流变性、大变形的特点,严重影响工程的稳定性,导致突发性灾害、安全事故不断增加。软岩处于高温、高压、水等多场耦合的复杂环境中,加之较强的时间效应,较低的抗压强度,使深部岩体的组织结构、使得基本行为特征和工程响应均发生根本性变化。这类岩体具有明显的流变特性,容易引起巷道、隧道的失稳和破坏。因此,温度、应力和水耦合作用下的软岩流变规律的研究具有重要的应用价值。本文以前人大量的理论研究为基础,通过多组实验研究,对石灰岩试样在单一场和耦合场作用下的变形量进行比较、统计,得出：软岩的流变特性在有水作用的情况下比天然状态下,表现得要明显很多；多场耦合的情况下,围压在一定程度上可以抑制变形的速率,且变形的速率随温度的增加而增大。科学计算方法被广泛地应用在工程的各个领域,本文采用了有限元方法,利用ANSYS软件对在以下几种情况下的石灰岩试样进行数值模拟：1)轴压、围压单一场作用；2)温度和轴压耦合；3)温度和围压耦合；4)温度、轴压和围压多场耦合。通过改变其中一个变量(温度、轴压和围压),对比分析石灰岩在不同环境下的等效应力云图、变形图、时间历程图和变形过程的动画,不仅从另一个侧面可视化的验证了实验结论,还避免了实验过程中取样不便、耗时耗力等方面的不足。
[Abstract]:Nowadays, the application scope, scale, depth and speed of the underground engineering are not comparable in the past. With the gradual decrease of shallow resources, the increase of mining depth of underground mineral resources and the construction of railway tunnels, more and more engineering soft rocks have been encountered in underground rock engineering. Engineering soft rock is the engineering rock mass which can produce significant plastic deformation under the action of engineering force. Because soft rock has the characteristics of plasticity, expansion, disintegration, rheology and large deformation, it seriously affects the stability of engineering, resulting in sudden disasters and increasing safety accidents. The soft rock is in the complex environment of high temperature, high pressure, water and so on. In addition, the strong time effect and low compressive strength make the structure of the deep rock mass and the basic behavior characteristics and engineering response change fundamentally. This kind of rock mass has obvious rheological characteristics, which can easily cause instability and failure of roadways and tunnels. Therefore, the study of soft rock rheology under the coupling of temperature, stress and water has important application value. Based on a large number of previous theoretical studies, this paper compares the deformation of limestone samples under the action of a single field and a coupled field through a number of experimental studies. It is concluded that the rheological behavior of soft rock is much more obvious than that of natural rock under the action of water, and the confining pressure can restrain the rate of deformation to a certain extent in the case of multi-field coupling. The rate of deformation increases with the increase of temperature. The scientific calculation method is widely used in various fields of engineering. In this paper, the finite element method is used to simulate the axial compression of limestone samples under the following conditions by using ANSYS software. Single field action of confining pressure (2) temperature and axial pressure coupling (3) temperature and confining pressure coupling temperature (4) temperature, axial pressure and confining pressure coupling. By changing one of the variables (temperature, axial pressure and confining pressure), the equivalent stress cloud map, deformation map, time history map and deformation process animation of limestone in different environments are compared and analyzed. Not only from the other side of the visual verification of the experimental conclusions, but also to avoid the inconvenient sampling, time-consuming and labor-consuming shortcomings.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU45;TU91

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