季冻区新型路基冷阻层隔振效果研究
发布时间：2019-03-22 07:57
【摘要】：随着交通基础设施建设的迅速发展,道路交通荷载引起的环境振动问题受到的关注程度越来越高。道路车辆引起的振动,以振动波的形式向路基和地基中传播,引起路基土体及地基土体的振动,同时通过地基土体向周围传播,导致周围结构物产生振动。长期振动导致土体动稳定性降低,道路变形沉降,增大了周围建筑结构的安全隐患。在分析XPS板隔振机理及隔振可行性的基础上,并基于课题组对新型冷阻层(XPS板+橡胶颗粒改良粉煤灰土组合结构)的研究基础,本文对新型冷阻层作为路基填料的隔振效果进行研究。旨在通过设置新型冷阻层,利用XPS板良好的隔振效果,减小道路交通荷载引起的振动对路基、地基及周围环境的影响。本文通过室内冲击荷载试验对新型冷阻层的隔振效果进行了探究,重点分析了XPS板厚度、振动强度、冻融循环次数对土体结构振动及新型冷阻层隔振效果的影响,并采用ABAQUS有限元软件对室内试验及实际道路进行了数值模拟分析,具体内容如下:(1)为了评价新型冷阻层及XPS板的隔振效果,本文设置了三组对比试验,就粉质黏土、改良土、新型冷阻层三种路基填料的隔振效果进行了对比。(2)为了确定XPS板的最佳厚度,文中对比了不同厚度的XPS板所构成的新型冷阻层的隔振效果,综合考虑经济指标、保温效果以及力学特性三项控制因素,选定了XPS板厚度的最佳值。(3)利用最佳厚度的XPS板所构成的新型冷阻层,探究了振动强度对土体结构振动及新型冷阻层隔振效果的影响。本文所设置的新型冷阻层主要应用于季冻区道路,为了模拟季冻区真实道路环境,对三种土体模型结构分别进行了五次冻融循环试验,对其振动情况进行了对比,分析了冻融循环次数对新型冷阻层隔振效果的影响。(4)利用ABAQUS有限元软件对室内试验进行了模拟,并将模拟结果与实际室内试验结果进行了比较。在验证有限元模拟的准确性及可行性的基础上,模拟了新型冷阻层在实际道路中的应用,并就结果中的隔振效果进行了评价。研究表明,在冲击荷载作用下,新型冷阻层及XPS板均具有一定的隔振效果,且竖向隔振效果明显。综合各种控制因素,确定了5cm为构成新型冷阻层的最佳XPS板厚度。土体结构振动随冲击荷载的增大而增大,新型冷阻层及XPS板的隔振效果随冲击荷载的增大先增大后逐渐趋于平稳。在冻融循环次数少的情况下,橡胶颗粒改良粉煤灰土及新型冷阻层的动稳定性均要优于粉质黏土,新型冷阻层在冻融循环过程中能保持一定的隔振效果,且竖向隔振效果明显。ABAQUS有限元软件的模拟分析表明,新型冷阻层路基减小了道路车辆荷载振动引起的路基土体及地基土体的振动变形以及对周围环境的影响。
[Abstract]:With the rapid development of traffic infrastructure, more and more attention has been paid to environmental vibration caused by road traffic load. The vibration caused by road vehicles propagates to the roadbed and foundation in the form of vibration wave, which causes the vibration of subgrade soil and foundation soil. At the same time, the vibration of surrounding structure is caused by the propagation of ground soil mass to the surrounding. The long-term vibration results in the decrease of dynamic stability of soil and the settlement of road deformation, which increases the hidden danger of the surrounding building structure. On the basis of analyzing the vibration isolation mechanism of XPS plate and the feasibility of vibration isolation, and based on the research foundation of the new type of cold resistance layer (XPS rubber particle modified fly ash-soil composite structure) by our team, this paper analyzes the mechanism of vibration isolation and the feasibility of vibration isolation. In this paper, the vibration isolation effect of a new type of cold resistance layer as subgrade filler is studied. The aim of this paper is to reduce the influence of vibration caused by road traffic load on subgrade, foundation and surrounding environment by setting a new type of cold resistance layer and making use of the good vibration isolation effect of XPS plate. In this paper, the vibration isolation effect of the new type of cold resistance layer is investigated through the indoor impact load test, and the effects of the thickness of the XPS plate, the vibration intensity and the number of freeze-thaw cycles on the vibration of the soil structure and the vibration isolation effect of the new type of cold resistance layer are analyzed emphatically. In order to evaluate the vibration isolation effect of new cold resistance layer and XPS board, three sets of contrast tests were set up in this paper, which are silty clay, and the results are as follows: (1) in order to evaluate the vibration isolation effect of new cold resistance layer and XPS board, the numerical simulation analysis of indoor test and practical road is carried out by using ABAQUS finite element software. (2) in order to determine the optimum thickness of the XPS plate, the vibration isolation effect of the new type of cold resistance layer composed of the different thickness of the XPS plate is compared in this paper, and the economic index is considered comprehensively, and the vibration isolation effect of the new type of subgrade filler is compared between the modified soil and the new type of cold resistance layer. The optimum thickness of the XPS plate is selected by three controlling factors: thermal insulation effect and mechanical properties. (3) A new type of cold resistance layer composed of the optimal thickness of the XPS plate is selected. The influence of vibration intensity on the vibration of soil structure and the vibration isolation effect of a new type of cold resistance layer is studied. In order to simulate the real road environment of the freezing zone, five freeze-thaw cycles of three soil model structures were carried out, and their vibration was compared. The influence of freezing and thawing cycles on the vibration isolation effect of the new type of cold resistance layer is analyzed. (4) the indoor test is simulated by using ABAQUS finite element software, and the simulation results are compared with the actual indoor test results. On the basis of verifying the accuracy and feasibility of the finite element simulation, the application of the new type of cold resistance layer in the actual road is simulated, and the vibration isolation effect of the results is evaluated. The results show that under the impact load, both the new cold resistance layer and the XPS plate have a certain vibration isolation effect, and the vertical vibration isolation effect is obvious. According to all kinds of control factors, the optimum thickness of 5cm is determined to form a new type of cold resistance layer. The vibration of soil structure increases with the increase of impact load, and the vibration isolation effect of new cold resistance layer and XPS plate increases at first and then tends to steady gradually with the increase of impact load. Under the condition of less cycles of freezing and thawing, the dynamic stability of rubber particle modified pulverized coal ash soil and new type of cold resistance layer are better than those of silty clay, and the new type of cold resistance layer can keep certain vibration isolation effect in the process of freezing and thawing, and the dynamic stability of the new type cold resistance layer is better than that of silty clay. The simulation analysis of Abaqus finite element software shows that the vibration deformation of subgrade soil and foundation soil caused by road vehicle load vibration is reduced and the influence on surrounding environment is reduced by using Abaqus finite element software.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1
本文编号：2445413
[Abstract]:With the rapid development of traffic infrastructure, more and more attention has been paid to environmental vibration caused by road traffic load. The vibration caused by road vehicles propagates to the roadbed and foundation in the form of vibration wave, which causes the vibration of subgrade soil and foundation soil. At the same time, the vibration of surrounding structure is caused by the propagation of ground soil mass to the surrounding. The long-term vibration results in the decrease of dynamic stability of soil and the settlement of road deformation, which increases the hidden danger of the surrounding building structure. On the basis of analyzing the vibration isolation mechanism of XPS plate and the feasibility of vibration isolation, and based on the research foundation of the new type of cold resistance layer (XPS rubber particle modified fly ash-soil composite structure) by our team, this paper analyzes the mechanism of vibration isolation and the feasibility of vibration isolation. In this paper, the vibration isolation effect of a new type of cold resistance layer as subgrade filler is studied. The aim of this paper is to reduce the influence of vibration caused by road traffic load on subgrade, foundation and surrounding environment by setting a new type of cold resistance layer and making use of the good vibration isolation effect of XPS plate. In this paper, the vibration isolation effect of the new type of cold resistance layer is investigated through the indoor impact load test, and the effects of the thickness of the XPS plate, the vibration intensity and the number of freeze-thaw cycles on the vibration of the soil structure and the vibration isolation effect of the new type of cold resistance layer are analyzed emphatically. In order to evaluate the vibration isolation effect of new cold resistance layer and XPS board, three sets of contrast tests were set up in this paper, which are silty clay, and the results are as follows: (1) in order to evaluate the vibration isolation effect of new cold resistance layer and XPS board, the numerical simulation analysis of indoor test and practical road is carried out by using ABAQUS finite element software. (2) in order to determine the optimum thickness of the XPS plate, the vibration isolation effect of the new type of cold resistance layer composed of the different thickness of the XPS plate is compared in this paper, and the economic index is considered comprehensively, and the vibration isolation effect of the new type of subgrade filler is compared between the modified soil and the new type of cold resistance layer. The optimum thickness of the XPS plate is selected by three controlling factors: thermal insulation effect and mechanical properties. (3) A new type of cold resistance layer composed of the optimal thickness of the XPS plate is selected. The influence of vibration intensity on the vibration of soil structure and the vibration isolation effect of a new type of cold resistance layer is studied. In order to simulate the real road environment of the freezing zone, five freeze-thaw cycles of three soil model structures were carried out, and their vibration was compared. The influence of freezing and thawing cycles on the vibration isolation effect of the new type of cold resistance layer is analyzed. (4) the indoor test is simulated by using ABAQUS finite element software, and the simulation results are compared with the actual indoor test results. On the basis of verifying the accuracy and feasibility of the finite element simulation, the application of the new type of cold resistance layer in the actual road is simulated, and the vibration isolation effect of the results is evaluated. The results show that under the impact load, both the new cold resistance layer and the XPS plate have a certain vibration isolation effect, and the vertical vibration isolation effect is obvious. According to all kinds of control factors, the optimum thickness of 5cm is determined to form a new type of cold resistance layer. The vibration of soil structure increases with the increase of impact load, and the vibration isolation effect of new cold resistance layer and XPS plate increases at first and then tends to steady gradually with the increase of impact load. Under the condition of less cycles of freezing and thawing, the dynamic stability of rubber particle modified pulverized coal ash soil and new type of cold resistance layer are better than those of silty clay, and the new type of cold resistance layer can keep certain vibration isolation effect in the process of freezing and thawing, and the dynamic stability of the new type cold resistance layer is better than that of silty clay. The simulation analysis of Abaqus finite element software shows that the vibration deformation of subgrade soil and foundation soil caused by road vehicle load vibration is reduced and the influence on surrounding environment is reduced by using Abaqus finite element software.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1
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