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为分析明挖隧道结构变形缝设置的影响因素以及变形缝设置间距优化的问题,以拱北隧道工程为依托,选取明挖段隧道开展研究工作,基于数值模拟方法,建立三维荷载-结构模型,分析地质因素、温度因素和结构形式等因素的影响机理,开展变形缝间距的优化研究。结果表明:变形缝的设置可解决隧道的不均匀变形,优化结构的受力状态,但同时也增加了结构的防水难度;主要地质影响因素为结构两侧的围岩等级差距;考虑温差对变形缝设置的影响,在结构所处环境内、外温差较大时,需要设置变形缝;优化后的拱北隧道明挖段区段4的变形缝间距为100m;原设计明挖段共需设置56个变形缝,经过计算优化后的变形缝数为36,减少约35.7%,优化区段长度为529m,占整个海域段的43.2%。
In order to analyze the factors that affect the setting of deformation joints and optimize the spacing of deformation joints, the research on the tunneling of Mingbei section is carried out based on the Gongbei tunnel project. Based on the numerical simulation method, a three-dimensional load-structure model is established and analyzed Geological factors, temperature and structural factors and other factors that affect the mechanism to carry out optimization of the deformation gap between the seam. The results show that the setting of deformation joint can solve the uneven deformation of the tunnel and optimize the stress state of the structure, but also increase the waterproofing difficulty of the structure. The main geological influencing factors are the grade difference of surrounding rock on both sides of the structure. Considering the effect of temperature difference on the deformation When the temperature difference between inside and outside of the structure is large, deformation joint shall be set; the spacing of deformation joints in the section 4 of the optimized excavation tunnel of Gongbei Tunnel is 100m; After deformation calculation, the number of deformation joints is 36 and the reduction is 35.7%. The length of optimized section is 529m, accounting for 43.2% of the total sea section.