磁性相似材料物理力学性能研究及其在磁力模型试验中的应用

发布时间：2018-01-02 10:35

本文关键词：磁性相似材料物理力学性能研究及其在磁力模型试验中的应用　出处：《上海交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,有关磁性相似材料在磁力模型试验中的应用的研究比较少,本文在已有的碎石土土工试验系统GTS300的基础上,研制了SDTS100应变式双压力室三轴试验系统,利用SDTS100进行磁性相似材料物理力学性能试验,研究不同组分对材料物理力学特性的影响;并根据磁力模型试验相似理论及相似比,配制了满足锦屏一级水电站拱坝左岸边坡部分岩体及其结构条件的磁性相似材料ISC;对已有的梯度磁场发生装置进行优化,选取ISC中铁粉、石英砂与粘土含量分别为47%、23%、20%的配比作为标准长方体模型材料的配合比,对标准长方体模型进行磁力模型试验和数值模拟,研究利用梯度磁场为地质力学模型加载的能力,验证磁性相似材料在磁力模型试验中应用的可行性。主要研究成果如下:1.在碎石土土工试验系统GTS300的基础上,根据磁性相似材料的试验要求,研制了SDTS100应变式双压力室三轴试验系统,并利用SDTS100进行了磁性相似材料的物理力学试验。试验结果表明:相似材料的密度、抗压强度主要受铁粉含量的影响,铁粉含量越多,材料的密度、抗压强度越大;当铁粉含量小于26%时,相似材料的粘聚力与弹性模量不断增大;铁粉粒径对试验结果也有一定的影响,铁粉越细,相似材料整体的密度和强度就越大,而铁粉越粗,材料的内摩擦角和泊松比越大;石英砂含量对密度的影响与铁粉相反,随含量的增加,密度减小。当石英砂含量小于30%时,抗压强度和弹性模量随其含量的增加而减小,而粘聚力和泊松比不断增大;相似材料中,粘土主要对材料的粘聚力影响比较显著,随粘土含量的增加,粘聚力不断增大;相似材料中加入铁粉后,存在一个合理的养护时间,养护时间过长会破坏相似材料的内部结构,降低材料的强度等其它性能;该磁性相似材料可模拟的密度范围为2.34~2.85g/cm3,抗压强度范围为0.14~0.96mpa,粘聚力范围为5.3~124.1kpa,内摩擦角范围6~57°,弹性模量范围8.4~72.5mpa,泊松比范围0.18~0.41,满足大多数模型试验对相似材料高容重、低抗压强度、低粘聚力、低弹性模量的要求。2.根据磁力模型试验相似理论及磁性相似材料的物理力学试验结果,配制了满足锦屏一级电站拱坝左岸边坡岩体及其结构条件的磁性相似材料isc,isc材料由铁粉、石英砂、粘土组成。当磁性相似材料中铁粉、石英砂、粘土含量分别为47%、23%、20%时,材料的力学参数满足锦屏一级电站拱坝左岸边坡iv1岩体的参数要求;当铁粉、石英砂、粘土含量分别为10%、65%、15%时,磁性相似材料的力学参数满足v岩体的参数要求;当铁粉、石英砂、粘土含量分别为55%、25%、10%时,材料的力学参数满足x软弱结构面的参数要求;当铁粉、石英砂、粘土含量分别为20%、62%、8%时,材料的力学参数满足锦屏f5、f8、f42-9断层的力学参数要求。3.对磁力模型试验梯度磁场发生装置进行了优化设计,利用锦屏一级电站左岸高陡边坡中的IV1岩层的磁性相似材料进行地质力学磁力模型试验验证性试验,并利用有限元方法进行数值模拟,将数值模拟结果与验证性试验结果对比分析。模型试验结果表明:在梯度磁场发生装置的通电电流为16A的情况下,可将锦屏一级电站左岸高陡边坡中的IV1岩层的相似材料的体力平均提高1.59倍,该结论与数值模拟结果相符。而模型试验与数值模拟结果的偏差主要是由相似材料中铁磁材料的性质和数值模拟过程中参数选取的理想化引起的。总体而言,磁力模型验证性试验和数值模拟结果共同说明了磁性相似材料在地质力学磁力模型试验研究中的可行性,为后期磁力模型试验提供了指导和参考。
[Abstract]:At present, the research and application of magnetic materials in magnetic similarity model test in less, based on soil test GTS300 gravel system has been developed on the SDTS100 strain type double pressure chamber three triaxial test system, carried out similar experiments of mechanical and physical properties of magnetic materials by SDTS100, different groups of effects on physical and Mechanical material characteristics; and the similarity theory and similarity ratio based on the magnetic model test preparation to meet the magnetic properties of Jinping hydropower station on the left bank slope rock and structure conditions of similar materials ISC; gradient magnetic field on existing device optimization, selection of ISC powder, quartz sand and clay content were 47%, 23%, 20% as with the ratio of standard rectangular model material ratio, simulate the magnetic model test and numerical standard of cuboid model, using gradient magnetic field geological force The ability to model loading, verify the feasibility of similar magnetic materials used in magnetic model test. The main research results are as follows: 1. based on soil test gravel GTS300 system, according to the requirements of magnetic test of similar materials developed SDTS100 strain type double pressure chamber three triaxial test system, and the similar material physical mechanics the magnetic test by SDTS100. The experimental results show that the similar material density, compressive strength is mainly affected by the iron content, iron content increasing, the density of the material, the compressive strength increased; when the iron content is less than 26%, similar to the cohesion and the elastic modulus of the material increases; the iron particle size on the test results are the effect of iron powder is finer, similar density and strength of the whole material is bigger, and the iron material is thicker, the internal friction angle and Poisson ratio decrease; effect of quartz sand content on density and In contrast with the increase of the content of iron powder, quartz sand, the density decreases. When the content is less than 30%, increase the compressive strength and elastic modulus with the content decreases, while the cohesion and Poisson's ratio increasing; similar material, mainly clay cohesion effect on material significantly, with the increase of clay content, the cohesion of time increase the amount of iron powder; similar material, there is a reasonable maintenance time, maintenance time is too long will damage similar to the internal structure of materials, reduce the other properties of the strength of the material; the magnetic material can simulate the similar density range is 2.34~2.85g/cm3, the compressive strength is in the range of 0.14~0.96mpa, the cohesion of the range of 5.3~124.1kpa, the internal friction angle range 6~57 degrees, the elastic modulus 8.4~72.5mpa, Poisson's ratio range of 0.18~0.41, meet most of model test of similar materials with high density, low compressive strength, low cohesion, low elastic modulus According to the requirements of.2. magnetic model test similar results of similar material physical mechanics theory and magnetic test preparation of magnetic meet the Jinping hydropower station on the left bank slope rock mass and structure conditions of similar materials ISC, ISC material is composed of iron powder, quartz sand, clay. When the magnetic material of similar iron powder, quartz sand, clay content respectively. 47%, 23%, 20%, the mechanical parameters of materials to meet the requirements of parameters of Jinping hydropower station on the left bank slope iv1 rock; when the iron powder, quartz sand, clay content were 10%, 65%, 15%, similar to magnetic material parameters to meet the requirements of V parameters of rock mass; when the iron powder, quartz sand, clay content were 55%, 25%, 10%, mechanical parameters of materials to meet the X requirements of weak structural plane parameters; when the iron powder, quartz sand, clay content were 20%, 62%, 8%, the mechanical parameters of materials to meet the Jinping F5, F8, f42-9 fault force Learn the.3. parameters optimization design was carried out on the magnetic gradient magnetic field generator model test, geomechanical model test verification testing of magnetic force by Jinping hydropower station on the left bank of high and steep slope IV1 rock similar material, and method of numerical simulation by finite element numerical simulation, the results of comparative analysis and confirmatory test results. The experimental results show that the electric current generating device in a gradient magnetic field for the case of 16A, the similar material of high and steep slope of Jinping hydropower station on the left bank of the IV1 rock strength increased an average of 1.59 times, with the conclusion of numerical simulation results. The deviation of model test results and numerical simulation is the main the ideal parameters caused by similar properties and numerical simulation of material of iron magnetic material. In general, the magnetic model experiments and numerical simulation. The result shows the feasibility of magnetic similar materials in the study of magnetic force model test of geomechanics, and provides guidance and reference for the later magnetic model test.

【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU41

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