张家口地区路基土动静力学特性与沉降影响因素研究
发布时间：2018-07-27 16:59
【摘要】：国务院公路计划从2013到2030年建成规模约40万公里的国家公路网,相对于铁路只能在大城市中穿梭,公路对于各个地区的联系以及人们的出行与生活显得更为重要,进而公路的安全性与舒适性也越来越重受到关注。由于长期经受交通荷载以及外界条件的影响路基表面极易形成不均匀沉降,给车辆的行驶与人们的安全带来了极大的威胁,同时已形成的沉降会加重车辆与路基的动态作用,进而造成更为严重的破坏。以往人们研究路基沉降主要集中于确定沉降计算模型,但由于试验方法等条件的限制使得模型具有非常大的局限性,并不能对工程的实际施工与后期运营提出实质性的建议。2022年冬奥会的成功申请以及京津冀一体化的加快,使得张家口地区的公路建设进入了一个新的发展阶段。本文以张宣公路至小村段山前冲积扇粉质粘土为研究对象,首先研究土体基本物性指标,为后续静动力学三轴试验提供基本依据;通过室内静三轴试验探寻土体抗剪强度指标以及弹性模量与土体压实度等物性指标的关系,并利用有限元软件分析边坡安全系数随压实度等条件的变化趋势;通过动力学试验分析长期循环荷载作用下土体动模量的变化过程,探寻土体物性指标如压实度以及实验条件如围压、频率等因素对于土体累积变形的影响,达到从实验角度研究不同因素对于路基沉降的影响并且引入敏感性分析量化不同因素的影响效果;最后利用有限元软件建立路基模型,介绍参数的选取以及动力施加依据,根据有限元软件研究路基在不同条件下沉降值变化趋势,通过敏感性分析方法研究不同条件对于路基沉降的影响效果,结合动力学试验结果与有限元分析结果得出结论,针对性提出减小路基沉降的措施。
[Abstract]:The State Council highway plan has built a national highway network of about 400 thousand kilometers from 2013 to 2030. The road is more important than the railway in the big cities. The road is more important to all areas and people's travel and life, and the safety and comfort of the highway are also getting more and more attention. The influence of load and external conditions on the subgrade surface is very easy to form uneven settlement, which poses a great threat to the driving of vehicles and the safety of people. At the same time, the settlement will aggravate the dynamic action of the vehicle and the subgrade, and cause more serious damage. However, due to the restriction of the test method and other conditions, the model has great limitations, and the actual construction and operation of the project can not be put forward a substantial proposal for the successful application of the Winter Olympic Games in.2022 and the acceleration of the integration of Beijing, Tianjin and Hebei. The construction of the highway in Zhangjiakou has entered a new stage of development. The research object is the silty clay of the alluvial fan in Xuan road to the small village. First, the basic physical properties of the soil are studied, and the basic basis is provided for the follow-up static and dynamic three axis test. The relationship between the shear strength index of soil and the relationship between the elastic modulus and the soil compaction degree is explored by the static three axis test in the room, and the finite element software is used. The change trend of slope safety coefficient with compactness and other conditions is analyzed. Through dynamic test, the change process of soil dynamic modulus under long-term cyclic loading is analyzed, and the influence of soil physical properties such as compactness and experimental conditions such as confining pressure and frequency on the cumulative deformation of soil is explored to study the different factors from the experimental point of view. The influence of Yu Luji settlement and sensitivity analysis are introduced to quantify the effect of different factors. Finally, the subgrade model is established by the finite element software, the selection of parameters and the basis of dynamic application are introduced. According to the finite element software, the variation trend of subgrade settlement value under different conditions is studied, and the different conditions are studied by the sensitivity analysis method. Combined with the results of dynamic test and finite element analysis, the effect of Yu Luji settlement is concluded, and measures for reducing the settlement of subgrade are put forward.
【学位授予单位】：河北建筑工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1
本文编号：2148527
[Abstract]:The State Council highway plan has built a national highway network of about 400 thousand kilometers from 2013 to 2030. The road is more important than the railway in the big cities. The road is more important to all areas and people's travel and life, and the safety and comfort of the highway are also getting more and more attention. The influence of load and external conditions on the subgrade surface is very easy to form uneven settlement, which poses a great threat to the driving of vehicles and the safety of people. At the same time, the settlement will aggravate the dynamic action of the vehicle and the subgrade, and cause more serious damage. However, due to the restriction of the test method and other conditions, the model has great limitations, and the actual construction and operation of the project can not be put forward a substantial proposal for the successful application of the Winter Olympic Games in.2022 and the acceleration of the integration of Beijing, Tianjin and Hebei. The construction of the highway in Zhangjiakou has entered a new stage of development. The research object is the silty clay of the alluvial fan in Xuan road to the small village. First, the basic physical properties of the soil are studied, and the basic basis is provided for the follow-up static and dynamic three axis test. The relationship between the shear strength index of soil and the relationship between the elastic modulus and the soil compaction degree is explored by the static three axis test in the room, and the finite element software is used. The change trend of slope safety coefficient with compactness and other conditions is analyzed. Through dynamic test, the change process of soil dynamic modulus under long-term cyclic loading is analyzed, and the influence of soil physical properties such as compactness and experimental conditions such as confining pressure and frequency on the cumulative deformation of soil is explored to study the different factors from the experimental point of view. The influence of Yu Luji settlement and sensitivity analysis are introduced to quantify the effect of different factors. Finally, the subgrade model is established by the finite element software, the selection of parameters and the basis of dynamic application are introduced. According to the finite element software, the variation trend of subgrade settlement value under different conditions is studied, and the different conditions are studied by the sensitivity analysis method. Combined with the results of dynamic test and finite element analysis, the effect of Yu Luji settlement is concluded, and measures for reducing the settlement of subgrade are put forward.
【学位授予单位】：河北建筑工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1
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