Research Of Setting Technology For Winter Protection Drainage Hole Of Highway Tunnel In High Altitude And Cold Regions

In view of the Qinghai Tibet Plateau Alpine permafrost area of extra long highwaytunnel leakage of cold setting water tunnel is insufficient, the Western transportationconstruction projects "the mechanical properties of frozen Alpine highway tunnel yearsand deformation control technology research" combination of the214state line road,the Republic of Yushu highway,ginger Ridge Road Tunnel Entrance elevation4300meters for cold tunnel relying on the project, through the measurement of largequantities of field stress condition of the temperature field and the structure, theoreticalanalysis and numerical simulation based on the theory of finite element (ANSYS)method, the alpine permafrost tunnel of highway tunnel in cold temperature,temperature-gravity coupling force characteristics, cold proof and heat insulation andmodel construction technology of the system, provides guidance for the highway tunnelinsulation cold tunnel design and construction and antifreeze.Based on the characteristics of the project, carried out the system of environmentaltemperature and the surrounding rock and the lining structure temperature fieldmeasurement and analysis. The numerical simulation of3D temperature field variationand load conditions inside and outside of the tunnel environmental temperature. In thedistance the cold tunnel entrance is near the temperature curve and outside the trend isvery similar, just outside temperature amplitude than the larger. The temperature changeis always passive accompanied by temperature changes on the outside and change, atthe same time, the farther the distance, the periodic and regular passive changeweakened. The cold tunnel temperature field numerical simulation, the mostunfavorable temperature function (low month outside air temperature function) as thetemperature load conditions entrance.Based on the temperature field of the measured results, the temperature in theoutside atmosphere temperature function as the load applied to the surface of mountainsand cold tunnel supporting structure surface, numerical simulation of temperature fieldusing the finite element method for unsteady heat conduction. The whole system isdivided into the main hole in advance and cold tunnel leading two different construction simulation analysis model, the calculation conditions to4.5meters for a in thehorizontal direction, cold tunnel from separation to combination system freeze-thawcircle variation.Using the indirect coupling, the numerical calculation of the third chapter of thetemperature field as the temperature load, applied with gravity loads on the structure,the cold tunnel and main tunnel system of3D temperature field and stress field couplingcalculation, simulation analysis of the variation of surrounding rock is the actualconstruction process in the field of comprehensive stress, according to the calculationresults recommended cold tunnel with set design parameters of structure and section.The drainage system through the anti common cold regions tunnel insulationmeasures for reference, proceed from the insulation design project, studies theperformance of thermal insulation material, using the finite element thermal analysistechnology, from the applied and did not impose insulating layer, focusing on theanalysis of thermal insulation materials insulation effect. By the two lining surfacetemperature inside the cave is determined the cold tunnel fortification of length450meters.