基于隧道振动台试验的材料配比及边界条件研究

发布时间：2018-03-17 23:14

本文选题：隧道　切入点：模型试验　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来,伴随我国城市化进程和西部大开发战略的不断推进,特殊复杂隧道工程例如高烈度区隧道、复杂地质条件隧道等将越来越多地展现在工程建设者面前。这些工程往往具有特殊性和复杂性,很难用现有理论进行描述。隧道模型试验能在一定程度下避开理论研究的很多不不甚合理的假设,更真实地模拟现实情况,因此在这类工程的研究中扮演着重要角色。试验中的模拟隧道—土体结构能否全面准确地反映真实结构的各种特性是试验精确与否的前提条件,而影响试验精确性的一个最重要的因素是隧道模型材料能否满足原型和模型之间由相似理论提出的各项物理力学参数。而在试验中模型材料和原型材料必然会有一些性质上的偏差,这种偏差虽不可消除但必须尽可能小。在这种情况下,研究模拟材料各参数偏差对试验数据结果的影响从而对试验精度进行有目的性的控制就具有重要的意义,本文依托国家自然科学基金科研项目《基于动力特性的隧道抗震设计深浅埋划分办法》,主要做了如下几个方面的工作： ①总结了国内外对隧道动力试验的相关问题研究现状,以及基于相似理论的模型模拟材料研究现状。 ②探讨了隧道—土体结构的合理计算区域从而给出了原型在动力作用下的计算模型。 ③研究了模拟围岩材料弹性模量、密度、泊松比、粘聚力和内摩擦角相对相似理论提出的材料参数严格相似比的偏差对于实验精度的影响。 ④研究了模拟衬砌材料弹性模量、密度、泊松比相对相似理论提出的材料参数严格相似比的偏差对于实验精度的影响。 ⑤研究了边界缓冲材料密度、厚度对于实验精度的影响。本文根据研究结果认为：模型框架内部和模拟围岩接触处应设置一定厚度的边界缓冲层,模拟围岩的弹性模量、密度、泊松比偏差对于动力实验数据的精确度的影响较大,这些材料参数偏差应严格控制在容许误差以内；模拟衬砌弹性模量偏差、密度偏差、泊松比偏差对于动力实验数据的精确度的影响不大,这些参数的误差可以适量放宽；模拟衬砌材料采用石膏：重晶石：石英沙：水：氯丁胶粘剂=1：1：1.5：1.3：0.3(重量比)；模拟围岩材料采用石英砂：松香酒精溶液：氯丁胶粘剂：重晶石：水：石膏=1：0.418：0.34：4.47：0.472：0.185(重量比)。
[Abstract]:In recent years, with the development of urbanization and the development of western China, special and complex tunnel projects, such as tunnels in high-intensity areas, The complex geological conditions, such as tunnels, will be more and more presented to the constructors of the projects, which are often special and complex. It is difficult to describe the existing theory. Tunnel model test can avoid many unreasonable assumptions of theoretical research to a certain extent and simulate the real situation more truthfully, so it plays an important role in the research of this kind of engineering. Whether the simulated tunnel-soil structure in the test can fully and accurately reflect the various characteristics of the real structure is a prerequisite for the accuracy of the test. One of the most important factors affecting the accuracy of the test is whether the tunnel model material can satisfy the physical and mechanical parameters proposed by the similarity theory between the prototype and the model. Some nature deviations, In this case, it is of great significance to study the effect of the deviation of parameters of simulated materials on the results of test data and thus to control test accuracy purposefully. Based on the research project of National Natural Science Foundation of China, "the method of dividing the depth and depth of seismic design based on dynamic characteristics", this paper mainly does the following work:. The main contents are as follows: 1. The current situation of research on dynamic test of tunnel is summarized, and the research status of model simulation material based on similarity theory is also summarized. 2. The reasonable calculation area of tunnel-soil structure is discussed and the calculation model of prototype under dynamic action is given. (3) the influence of the deviation of material parameters such as elastic modulus, density, Poisson's ratio, cohesion and internal friction angle on the experimental accuracy is studied. (4) the influence of the deviation of the strict similarity ratio of the material parameters on the experimental accuracy is studied, which is based on the relative similarity theory of simulating the elastic modulus, density and Poisson's ratio of lining materials. 5. The influence of the density and thickness of the boundary buffer material on the experimental accuracy is studied. Based on the results of the study, it is concluded that a certain thickness of boundary buffer layer should be set in the frame of the model and the contact of the simulated surrounding rock, and the elastic modulus, density and Poisson's ratio deviation of the surrounding rock should have a great influence on the accuracy of the dynamic experimental data. The deviation of these material parameters should be strictly controlled within the allowable error, and the deviation of elastic modulus, density and Poisson's ratio of the simulated lining has little effect on the accuracy of the dynamic experimental data, and the error of these parameters can be relaxed appropriately. The simulated lining materials are gypsum: barite: quartz sand: water: Chloroprene adhesive 1: 1. 5: 1. 3: 0.3: 0.3 (weight ratio); simulated surrounding rock material is quartz sand: Rosin alcohol solution: Chloroprene adhesive: barite: water: gypsum: gypsum 1 0.418: 0. 34: 4.47 4. 472: 0. 185.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456

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