青藏铁路冻土区路基稳定性研究建筑与土木工程专业论文.docxVIP

The The stability study on subgrade of qinghai--tibet railway permafrost regions Discipline：Architecture and Civil Engineering student Signat— F叼w鲫hi Supervisor I Signature： ．细xj n吩 Super、ris。r II signature：2-i阢 Abstract With the constant deepening of”western development”strategy in叫r country,especially of the qinghai-tibet railway construction，thus，the stability of railway roadbed is highlighted， and caused widespread concern．In order to serve the railway construction of permafrost regions，avoiding the disease problems，providing reference to the frozen permafrost roadbed design and construction，such as for the research of railway roadbed stability． This paper describes the Tibetan frozen soil environment,such as：temperature． precipitation，solar radiation，wind，etc．The author introduces the characteristics of permafrost． further to study the distribution of permafrost，physical properties and thermal physical properties,mechanical properties and the characteristics of freezing and thawing,thus cleared the permafrost of general characteristics and the rule temperature change．Using the scaled tmite element simulation software ADINA，we analysis the flaky layer roadbed and ripped。rock embankment ofthe qinghai-tibet railway．Through establish the above two kinds of simulation model of roadbed，in the model with reference to the actual engineering situation． set the boundary conditions of the model．At the same time，the soil layers，锄d t11e heat conduction coefficient，specific heat,density parameters，respectively gives to the layers of soil． using the Structures in the module and Thermal module ofADINA to solve．Record the next 50 years in the solving process of temperature field and the change of the settlement，in the end， calculate the temperature field cloud picture and cumulative settlement curve．and summarized and analyzed． 万方数据 In In this article，through the simulation results of the frozen soil roadbed，we get the temperature change rule from temperature field，slo