【作者】 贾胜娟；

【导师】 杨春风；

【作者基本信息】 河北工业大学 ， 道路与铁道工程， 2007， 硕士

【摘要】 近些年来,随着国民经济持续快速健康发展,高等级公路的建设正以前所未有的发展速度向前推进。由于高等级公路所经过地区的地质条件千差万别,所以需要进行大量的半填半挖处理,以免造成路基的不均匀沉降。路基的不均匀沉降是公路的常见病害之一,它可以导致路面产生较大的横向和纵向开裂,甚至错台、坍塌,严重影响道路的使用性能和服务水平,严重制约着高等级公路工程的建设质量和建成后的长期使用性能。虽然以前也有许多处理方法,但效果并不理想。土工格室是一种新型的土工合成材料,它工程性能优越,近年来被广泛应用于现代土木工程领域,并取得了良好的加固效果。本文通过理论分析和有限元模拟主要进行了以下几方面的工作:1.分析了土工格室的强度特性和加筋机理,得出土工格室加筋体可以增强地基约束力,提高地基承载力,调整不均匀沉降。2.详细介绍了ANSYS面-面接触分析方法及生死单元的控制和使用,充分利用ANSYS有限元软件进行模型范围的确定。3.利用ANSYS有限元软件对半填半挖路基进行了数值分析,分析了土工格室高度、格室模量以及垫层厚度等影响加筋效果的几个因素,所得出的结论对工程实践有一定的参考价值。更多还原

【Abstract】 High-grade road construction is developing in unexampled speed along with the rapid andhealthy development of the national economy in recent years. The geological conditions of thearea that high-grade road passed through are infinitely different, so massive half-filled andhalf-dug treatments are needed in order to avoid uneven settlement of the roadbed. Unevensettlement of the roadbed is one of the common diseases of road, it may leads to relativelylargetransverse and lengthways cracking, even step and collapse, so affects the performance and theservice level of the road seriously, also restricts construction quality and long-term performanceofthehigh-graderoadprojectseriously.Though there have been many methods to deal with uneven settlement of the roadbed, buttheeffectisunsatisfactory.Geocellisanewkindofgeosynthtics;ithasspatialconfigurationandpredominant performance. Geocell has been widely used in soft ground reinforcement of manykinds of civil engineering in recent years, and its reinforcement achieved good results. Severalmain works and results of this paper are listed as follows, which were studied by theoreticalanalysisandfiniteelementsimulation.Firstly, the intensity characteristics and mechanism of embankment reinforced withgeosynthtics were analyzed; it can be concluded that the binding force of roadbed can bestrengthened by geocell, also the carrying capacity of roadbed can be improved and unevensettlementofroadbedcanbeadjustedbygeocell.Secondly, surface to surface contact analysis method, together with the control and use ofthe birth and death unit in ansys were introduced in detail, the range of model is determined byANSYSfinitesoftware.Thirdly, half-filled and half-dug road were analyzed by the ansys finite software. Thefactors which effect on road such as the thickness, modulus of geocell and the modulus ofgeocell mat were analyzed. Some useful results were obtained which can be referenced byprojectpractice.更多还原