【摘要】：本文針對溫度場對2座寒區(qū)隧道之間的最小合理間距進(jìn)行了研究。重點(diǎn)分析了鄰近寒區(qū)隧道之間的圍巖溫度場隨時間的變化情況，并提出了一種判斷相鄰寒區(qū)隧道間距是否合理的方法。 為了盡量縮小環(huán)境破壞的范圍，便于參考已建成線路進(jìn)行勘察、設(shè)計、施工，避免浪費(fèi)額外的人力、物力和財力。必然會出現(xiàn)較多的新建隧道與已建隧道相鄰的情況。本文圍繞已建成通車的青藏鐵路昆侖山鐵路隧道展開，并在距離該隧道右邊墻的水平位置25m~35m范圍內(nèi)模擬新建一個公路隧道，采用數(shù)值模擬、數(shù)據(jù)對比的方法分析研究了兩座鄰近寒區(qū)隧道之間圍巖的溫度場分布狀況。本文還研究了3個特定位置的圍巖溫度在不同時間、不同間距和不同工況下的溫度變化情況。本文最后還采用ANSYS軟件里面的優(yōu)化模塊（/OPT），通過優(yōu)化設(shè)計確定了考慮溫度場下兩座寒區(qū)隧道合理間距的可行域，并最終確定了兩座寒區(qū)隧道的最小合理間距BHmin。 首先針對兩座相鄰寒區(qū)隧道溫度場的影響規(guī)律，，結(jié)合工程實(shí)例，采用數(shù)值模擬手段進(jìn)行瞬態(tài)溫度分析，采用25m和35m兩個極限間距的模型作為典型工況，對比在修建新隧道與不修建新隧道2種情況下，昆侖山鐵路隧道附近的圍巖溫度在不同時期的不同狀態(tài)，研究得到了對既有隧道附近圍巖溫度場的影響規(guī)律。主要規(guī)律為新建隧道施工期間對兩條隧道之間圍巖溫度場的影響遠(yuǎn)大于新隧道通車后對兩條隧道之間圍巖溫度場的影響。整個溫度場在新隧道通車后（第16年）明顯開始趨于穩(wěn)定。 然后使用ANSYS優(yōu)化模塊。優(yōu)化的目標(biāo)是當(dāng)新隧道通車時，對既有隧道原有溫度場的干擾能夠消除。計算了在同一種施工方案下，新建公路隧道既有昆侖山鐵路隧道的影響，給定了優(yōu)化設(shè)計的的約束條件和臨界條件，最終找出了的合理間距區(qū)間BH，并找出了最小合理間距BHmin。 最優(yōu)方案滿足的主要約束條件為：B∈[25m,35m]。滿足的臨界條件為：ΔT16max≤0.2℃。當(dāng)B=BHmin時，距既有隧道15m的D15位置的ΔT16max=0.19426℃＜0.2℃，計算結(jié)果正確。 最優(yōu)方案下，新建隧道通車后，兩隧道之間圍巖的最高溫度變化約在-2.681℃~-2.752℃范圍，比第10年同期溫度僅下降了1.9%~4.6%。這表明新隧道通車后對兩條隧道之間圍巖溫度場的影響已基本消除。
[Abstract]:In this paper, the minimum reasonable spacing between two tunnels in cold region is studied according to the temperature field. In this paper, the variation of surrounding rock temperature field with time between tunnels in adjacent cold regions is analyzed emphatically, and a method to judge whether the distance between tunnels in adjacent cold regions is reasonable or not is put forward. In order to minimize the scope of environmental damage, it is easy to refer to the built lines for investigation, design, construction, and avoid wasting additional manpower, material and financial resources. There must be more new tunnels adjacent to the existing ones. In this paper, the Kunlun Mountain Railway Tunnel of the Qinghai-Tibet Railway, which has been opened to traffic, is carried out, and a new highway tunnel is simulated within the horizontal position of 25m~35m from the right wall of the tunnel, and the numerical simulation is adopted. The temperature field distribution of surrounding rock between two tunnels in adjacent cold region is analyzed by the method of data comparison. In this paper, the temperature variation of the surrounding rock at different time, spacing and working conditions at three specific locations is also studied. Finally, the optimization module in ANSYS software (/ OPT),) is used to determine the feasible region considering the reasonable spacing between the two tunnels in the cold region under the temperature field, and finally the minimum reasonable spacing of the tunnels in the two cold regions is determined by the optimal design. Firstly, according to the influence law of temperature field in two adjacent cold region tunnels, combined with engineering example, the transient temperature analysis is carried out by means of numerical simulation, and the two limit spacing models of 25m and 35m are adopted as the typical working conditions. Comparing the different conditions of surrounding rock temperature near Kunlun Mountain Railway Tunnel in different periods under the conditions of constructing new tunnel and not constructing new tunnel, the influence rule of surrounding rock temperature field near existing tunnel is studied. The main rule is that the influence of the surrounding rock temperature field between the two tunnels during the construction of the new tunnel is much greater than that of the surrounding rock temperature field between the two tunnels after the opening of the new tunnel. The whole temperature field began to stabilize obviously after the opening of the new tunnel (16 years). Then use ANSYS optimization module. The objective of the optimization is to eliminate the interference to the existing temperature field when the new tunnel is opened to traffic. Under the same construction scheme, the influence of the existing Kunlun Mountain railway tunnel in the new highway tunnel is calculated. The constraint conditions and critical conditions of the optimal design are given. Finally, the reasonable interval BH, and the minimum reasonable spacing BHmin. are found out. The main constraints of the optimal scheme are: B 鈭

本文編號：2430365