本文關鍵詞：磁性相似材料物理力學性能研究及其在磁力模型試驗中的應用　出處：《上海交通大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 磁性相似材料 鐵磁材料 土工試驗系統(tǒng) 梯度磁場發(fā)生裝置 相對磁導率 磁力模型試驗

【摘要】：目前,有關磁性相似材料在磁力模型試驗中的應用的研究比較少,本文在已有的碎石土土工試驗系統(tǒng)GTS300的基礎上,研制了SDTS100應變式雙壓力室三軸試驗系統(tǒng),利用SDTS100進行磁性相似材料物理力學性能試驗,研究不同組分對材料物理力學特性的影響;并根據(jù)磁力模型試驗相似理論及相似比,配制了滿足錦屏一級水電站拱壩左岸邊坡部分巖體及其結構條件的磁性相似材料ISC;對已有的梯度磁場發(fā)生裝置進行優(yōu)化,選取ISC中鐵粉、石英砂與粘土含量分別為47%、23%、20%的配比作為標準長方體模型材料的配合比,對標準長方體模型進行磁力模型試驗和數(shù)值模擬,研究利用梯度磁場為地質(zhì)力學模型加載的能力,驗證磁性相似材料在磁力模型試驗中應用的可行性。主要研究成果如下:1.在碎石土土工試驗系統(tǒng)GTS300的基礎上,根據(jù)磁性相似材料的試驗要求,研制了SDTS100應變式雙壓力室三軸試驗系統(tǒng),并利用SDTS100進行了磁性相似材料的物理力學試驗。試驗結果表明:相似材料的密度、抗壓強度主要受鐵粉含量的影響,鐵粉含量越多,材料的密度、抗壓強度越大;當鐵粉含量小于26%時,相似材料的粘聚力與彈性模量不斷增大;鐵粉粒徑對試驗結果也有一定的影響,鐵粉越細,相似材料整體的密度和強度就越大,而鐵粉越粗,材料的內(nèi)摩擦角和泊松比越大;石英砂含量對密度的影響與鐵粉相反,隨含量的增加,密度減小。當石英砂含量小于30%時,抗壓強度和彈性模量隨其含量的增加而減小,而粘聚力和泊松比不斷增大;相似材料中,粘土主要對材料的粘聚力影響比較顯著,隨粘土含量的增加,粘聚力不斷增大;相似材料中加入鐵粉后,存在一個合理的養(yǎng)護時間,養(yǎng)護時間過長會破壞相似材料的內(nèi)部結構,降低材料的強度等其它性能;該磁性相似材料可模擬的密度范圍為2.34~2.85g/cm3,抗壓強度范圍為0.14~0.96mpa,粘聚力范圍為5.3~124.1kpa,內(nèi)摩擦角范圍6~57°,彈性模量范圍8.4~72.5mpa,泊松比范圍0.18~0.41,滿足大多數(shù)模型試驗對相似材料高容重、低抗壓強度、低粘聚力、低彈性模量的要求。2.根據(jù)磁力模型試驗相似理論及磁性相似材料的物理力學試驗結果,配制了滿足錦屏一級電站拱壩左岸邊坡巖體及其結構條件的磁性相似材料isc,isc材料由鐵粉、石英砂、粘土組成。當磁性相似材料中鐵粉、石英砂、粘土含量分別為47%、23%、20%時,材料的力學參數(shù)滿足錦屏一級電站拱壩左岸邊坡iv1巖體的參數(shù)要求;當鐵粉、石英砂、粘土含量分別為10%、65%、15%時,磁性相似材料的力學參數(shù)滿足v巖體的參數(shù)要求;當鐵粉、石英砂、粘土含量分別為55%、25%、10%時,材料的力學參數(shù)滿足x軟弱結構面的參數(shù)要求;當鐵粉、石英砂、粘土含量分別為20%、62%、8%時,材料的力學參數(shù)滿足錦屏f5、f8、f42-9斷層的力學參數(shù)要求。3.對磁力模型試驗梯度磁場發(fā)生裝置進行了優(yōu)化設計,利用錦屏一級電站左岸高陡邊坡中的IV1巖層的磁性相似材料進行地質(zhì)力學磁力模型試驗驗證性試驗,并利用有限元方法進行數(shù)值模擬,將數(shù)值模擬結果與驗證性試驗結果對比分析。模型試驗結果表明:在梯度磁場發(fā)生裝置的通電電流為16A的情況下,可將錦屏一級電站左岸高陡邊坡中的IV1巖層的相似材料的體力平均提高1.59倍,該結論與數(shù)值模擬結果相符。而模型試驗與數(shù)值模擬結果的偏差主要是由相似材料中鐵磁材料的性質(zhì)和數(shù)值模擬過程中參數(shù)選取的理想化引起的。總體而言,磁力模型驗證性試驗和數(shù)值模擬結果共同說明了磁性相似材料在地質(zhì)力學磁力模型試驗研究中的可行性,為后期磁力模型試驗提供了指導和參考。
[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.

【學位授予單位】：上海交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU41

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本文編號：1368855