Evaluation Of The Subgrade Stability In Permafrost Region Of Qinghai-Tibet Corridors Based On ArcGIS

With the global warming and human activity intensifying, Qinghai-Tibet Plateaupermafrost environment will suffer much more intense disturbance and produce a new change.The risement of temperature and the intensification of human activities will cause thedegradation of permafrost and result in extremely adverse effects on the stability ofpermafrost subgrade. Under this situation, how to make evaluation and prediction of thesubgrade stability priorly has an important signification on timely repairing and ensuring thenormal operation of the subgrade.Taking the evaluation of permafrost subgrade stability as the main line, this paper startwith the permafrost environment of subgrade and the main diseases which is reasulted fromsubgrade losement, the main part is as following:(1)This paper discribes the composition and characteristics of permafrost subgradedeformation, taking in ANFIS combined with the measured data of subgrade deformation,build a model of subgrade deformation prediction, make a prediction of subgrade deformationby the model, as well as the further analysis of the characteristics of subgrade deformationcombining with the predicted result.(2)Through analyzing the factors influencing the frozen subgrade stability, and on thebasis of AHP and FCE, establishing the fuzzy comprehensive evaluation model of frozensubgrade combined with the actual situation of the permafrost subgrade in Tibetan Plateau,finally evaluates the actual subgrade through using the evaluation model.(3)By combining the method of FEM and GIS, the paper analyses and determines theevaluation index and criteria, the corridor of permafrost subgrade stability evaluation diagramin Qinghai-Tibet was obtained by ArcGIS. In the end, this paper picks up the distribution ofthe Qinghai-Tibet Highway subgrade stability, analyses the partition results combined withthe reality.(4) By the thought of multi-factors-based spatial fuzzy comprehensive evaluation, theconcept of membership layer was introduced, then the paper discussed and defined itscalculation method and operation method of fuzzy comprehensive evaluation, the corridor ofpermafrost subgrade stability evaluation diagram in Qinghai-Tibet was obtained by ArcGIS.And statistical data were obtained, then discussion and analysis of the evaluation result wereproceeded in reference to the map and statistical data.The study of this paper introduced a new method for the prediction of permafrost subgrade deformation and provide a new idea for evaluation and visualization of permafrostsubgrade stability; The stability evaluation model of permafrost subgrade can be used forpermafrost subgrade stability evaluation effectively, furthermore the permafrost subgradestability evaluation diagram and the obtained regularity can provide certain academicreference for the repairment and maintenance of permafrost subgrade in Qinghai-Tibetcorridor.