【摘要】：鑒于青藏高原高寒多年凍土地區(qū)特長公路隧道防寒泄水洞設(shè)置技術(shù)研究不足的現(xiàn)狀，論文結(jié)合西部交通建設(shè)科技項目“高寒公路隧道多年凍土力學(xué)特性及變形控制技術(shù)研究”，以國道214線共和至玉樹公路，洞口標(biāo)高4300米的姜路嶺特長隧道防寒泄水洞為依托工程，通過對溫度場和結(jié)構(gòu)受力情況的大批量現(xiàn)場實測，基于有限元理論的理論分析和數(shù)值模擬（ANSYS）手段，，對高寒多年凍土區(qū)公路隧道防寒泄水洞的溫度場、溫度-重力耦合作用下的受力特性、防寒保溫和新型施工技術(shù)進(jìn)行了系統(tǒng)研究，為該地區(qū)公路隧道防寒泄水洞的設(shè)計施工和防凍保溫提供了指導(dǎo)。 針對依托工程特點，開展了系統(tǒng)的環(huán)境溫度和圍巖及襯砌支護(hù)結(jié)構(gòu)溫度場測試分析。得出了洞內(nèi)外環(huán)境溫度的年變化規(guī)律和三維溫度場數(shù)值模擬的荷載條件。在距離防寒泄水洞洞口較近處溫度年變化曲線和洞外變化趨勢很相似，只是洞外的溫度振幅比洞內(nèi)的偏大。洞內(nèi)的溫度變化總是被動的伴隨著洞外的溫度變化而變化，同時距離洞口越遠(yuǎn)，被動變化的周期性和規(guī)律性減弱。對防寒泄水洞溫度場數(shù)值模擬時，將最不利的溫度函數(shù)（低溫月份洞外大氣溫度函數(shù)）作為洞口段的溫度載荷條件。 基于溫度場現(xiàn)場實測結(jié)果，將低溫月份洞外大氣溫度函數(shù)作為荷載加到山體表面和防寒泄水洞支護(hù)結(jié)構(gòu)表面，采用非穩(wěn)態(tài)熱傳導(dǎo)有限元法對溫度場進(jìn)行數(shù)值模擬。對整個體系分為主洞先行和防寒泄水洞先行兩種不同施作模式下的模擬分析，同時研究了在水平方向上以4.5米為一個計算工況，防寒泄水洞從分離到合并的體系凍融圈變化規(guī)律。 采用間接耦合法，將第三章溫度場數(shù)值計算的結(jié)果作為溫度荷載，和重力荷載一起施加在結(jié)構(gòu)上，對防寒泄水洞和主洞體系進(jìn)行三維溫度場和應(yīng)力場耦合計算，模擬分析實際施工過程中圍巖耦合場綜合應(yīng)力的變化規(guī)律，根據(jù)計算結(jié)果推薦了防寒泄水洞合并設(shè)置結(jié)構(gòu)形式及斷面設(shè)計參數(shù)。 通過對一般寒區(qū)隧道防排水系統(tǒng)保溫措施的借鑒，從依托工程的保溫設(shè)計著手，研究了保溫材料的性能，運用有限元熱分析技術(shù)，從施加和未施加保溫層方面，著重分析研究了保溫材料的保溫效果。由洞內(nèi)二次襯砌表面溫度是否為正確定了防寒泄水洞設(shè)防長度為450米。
[Abstract]:In view of the insufficient research on the technology of setting up the cold proof and releasing water tunnel of the super long highway tunnel in the alpine permafrost area of the Qinghai-Xizang Plateau, this paper combines with the western transportation construction project "study on the mechanical characteristics and deformation control technology of the permafrost in the alpine highway tunnel". Based on the highway between Gonghe and Yushu on the 214th national highway and the 4300 meter elevation of the tunnel at the entrance of Jianglu Ling, the cold prevention and drainage tunnel of Jianglu Ling is used as the support project. The field measurements of the temperature field and the stress on the structure are carried out in large quantities. Based on the theoretical analysis of finite element theory and numerical simulation of (ANSYS), the temperature field of highway tunnel in alpine permafrost region under the coupled action of temperature and gravity is studied. The cold insulation and new construction technology are studied systematically, which provides the guidance for the design and construction of the cold proof and discharge tunnel in this area. According to the characteristics of engineering, the temperature field of surrounding rock and lining support structure are tested and analyzed systematically. The annual variation of ambient temperature inside and outside the tunnel and the load conditions of three dimensional numerical simulation of temperature field are obtained. The annual variation curve of temperature is very similar to that outside the tunnel, but the amplitude of temperature outside the tunnel is larger than that in the hole. The variation of temperature in the hole always changes passively with the change of temperature outside the hole. At the same time, the farther away from the hole, the periodicity and regularity of the passive change weaken. The most unfavorable temperature function (the temperature function outside the tunnel) is taken as the temperature load condition of the tunnel in the numerical simulation of the temperature field of the cold-proof drain tunnel. Based on the measured results of the temperature field, the temperature field is simulated numerically by the unsteady heat conduction finite element method (FEM), which is applied to the mountain surface and the supporting structure surface of the cold-proof drain tunnel as the load of the temperature function outside the low-temperature month tunnel. The whole system is divided into two different application modes: main tunnel first and cold drain tunnel. At the same time, the horizontal direction of 4.5 meters is studied as a calculation condition. The freeze-thawing cycle of the freeze-thawing system is changed from the separation to the amalgamation of the freeze-thawing tunnel. Using the indirect coupling method, the numerical results of the third chapter temperature field are applied to the structure together with the gravity load as the temperature load, and the three-dimensional temperature field and stress field of the cold-proof drain tunnel and the main tunnel system are calculated. The variation law of the comprehensive stress of the surrounding rock coupling field in the actual construction process is simulated and analyzed. According to the calculation results, the combined structure form and section design parameters of the cold-proof drain tunnel are recommended. Through the reference to the insulation measures of the tunnel waterproofing and drainage system in the common cold area, the performance of the insulation material is studied by relying on the insulation design of the project. The finite element thermal analysis technique is used to apply and not apply the insulation layer. The thermal insulation effect of thermal insulation material is analyzed and studied emphatically. According to whether the surface temperature of the secondary lining in the tunnel is positive or not, the length of the tunnel fortification is 450 meters.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U457.2

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