浅埋大跨小净距公路隧道施工方法比选及变形控制研究
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摘要
为了对比分析上下台阶法和CD法(中隔墙法)施工引起的隧道变形及受力特点,依托滨莱高速公路淄博西至莱芜段改扩建工程中的樵岭前隧道施工,基于FLAC~(3D)数值模拟软件,并结合现场施工应用情况,对比分析两种工法的优缺点,进而提出了有效的变形控制措施。研究结果表明:CD法施工在控制地面沉降及围岩变形方面优于上下台阶法,且产生的围岩塑性区较小;上下台阶法具有足够的施工空间与较快的施工速度,且相对CD法施工成本降低,但在浅埋隧道工程中易造成隧道围岩变形过大等问题,更多的是采用CD法;注浆加固可以有效地提高围岩的自稳性,增加径向注浆长度以及预留段长度等措施具有较高的可操作性,同时也有较好的加固效果。
In order to compare and analyze the tunnel deformation and stress characteristics caused by the construction of the bench method and the CD(center diaphragm) method, the construction of the Qian Lingqian tunnel in the reconstruction and expansion project of Zibo West to Laiwu Section of Binlai Expressway is simulated by FLAC~(3 D). Combined with the on-site construction application, the advantages and disadvantages of the two methods are compared and analyzed, and then effective deformation control measures are proposed. The results are as follows: CD method is better than bench method in controlling ground subsidence and surrounding rock deformation, and the resulting plastic zone of surrounding rock is smaller; the bench method has sufficient construction space and faster construction speed, and the construction cost is lower than that of the CD method, but in the shallow buried tunnel construction, the deformation of the surrounding rock of the tunnel is likely to be too large, therefore the CD method is widely used; grouting reinforcement can effectively improve the self-stability of the surrounding rock. Measures such as increasing the length of the radial grouting and the length of the reserved section have higher operability and have better reinforcement effects as well.
In order to compare and analyze the tunnel deformation and stress characteristics caused by the construction of the bench method and the CD(center diaphragm) method, the construction of the Qian Lingqian tunnel in the reconstruction and expansion project of Zibo West to Laiwu Section of Binlai Expressway is simulated by FLAC~(3 D). Combined with the on-site construction application, the advantages and disadvantages of the two methods are compared and analyzed, and then effective deformation control measures are proposed. The results are as follows: CD method is better than bench method in controlling ground subsidence and surrounding rock deformation, and the resulting plastic zone of surrounding rock is smaller; the bench method has sufficient construction space and faster construction speed, and the construction cost is lower than that of the CD method, but in the shallow buried tunnel construction, the deformation of the surrounding rock of the tunnel is likely to be too large, therefore the CD method is widely used; grouting reinforcement can effectively improve the self-stability of the surrounding rock. Measures such as increasing the length of the radial grouting and the length of the reserved section have higher operability and have better reinforcement effects as well.
引文
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[12] Dong L I, Xingling H E, Qin L, et al. Stability control of ultra shaalow-buried metro tunnel with super large-span in process of crossing bridge[J]. Chinese Journal of Rock Mechanics & Engineering, 2013,32:3636-3642.
[13] 熊慧中,王平,吕鑫,等.超浅埋大跨度连拱隧道下穿国道沉降控制研究[J].公路工程,2014,39(6):25-28,55.
[14] 川田,魏红.最小间距的大型双线公路隧道的观测施工[J].水电技术信息,1996(Z01):146-155.
[15] 褚衍玉,张聪瑞,任高峰,等.后行洞开挖对浅埋偏压小净距隧道影响研究[J].武汉理工大学学报(交通科学与工程版),2016,40(5):919-922.
[16] 曹成勇,施成华,彭立敏,等.浅埋大跨下穿高速公路隧道施工风险评估及控制措施研究[J].铁道科学与工程学报,2016,13(7):1439-1446.
[2] 李光凯,刘志龙.烟台某浅埋大跨小净距隧道施工方法优化分析[J].安徽建筑,2014,21(1):123-123.
[3] 白家设,赵绍鹏,齐兵,等.软弱地层浅埋大跨双连拱隧道支护结构变形研究[J].土木工程学报,2017(S2):45-50.
[4] 于雅琳,武科,王亚君.深圳地铁在建明挖隧道区间基坑工程施工过程数值模拟[J].水利与建筑工程学报,2017,15(6):158-162.
[5] 陶云平.软弱围岩隧道变形破坏机制及处治措施研究[J].华北水利水电大学学报(自然科学版),2016,37(1):69-72.
[6] Shi S S, Li S C, Zhou Z Q, et al. Influence law of structural inclination for the construction of shallow-buried highway tunnel[J]. Journal of Interdisciplinary Mathematics, 2014,17(4):333-343.
[7] 尚淑萍,胡玉娇,徐彦妮.基于既有线平顺性浅埋暗挖隧道地面沉降控制标准[J].水利与建筑工程学报,2014,12(2):95-99.
[8] 孙景凤,李文华,董亥兴,等.超小净距大跨度隧道岩柱稳定性分析[J].中外公路,2014,34(2):210-214.
[9] 刘宝超,张兵兵.超大跨度隧道开挖方法与支护体系优化分析[J].中国市政工程,2014(5):72-74.
[10] Su J F, Xu Y F. Application of the CRD method in construction of an ultra-shallow, ultra-high section and large-span mined tunnel[J]. Advanced Materials Research, 2013,790:231-234.
[11] Cao C, Shi C, Lei M, et al. Deformation characteristics and countermeasures of shallow and large-span tunnel under-crossing the existing highway in soft soil: a case study[J]. Ksce Journal of Civil Engineering, 2017(4):1-12.
[12] Dong L I, Xingling H E, Qin L, et al. Stability control of ultra shaalow-buried metro tunnel with super large-span in process of crossing bridge[J]. Chinese Journal of Rock Mechanics & Engineering, 2013,32:3636-3642.
[13] 熊慧中,王平,吕鑫,等.超浅埋大跨度连拱隧道下穿国道沉降控制研究[J].公路工程,2014,39(6):25-28,55.
[14] 川田,魏红.最小间距的大型双线公路隧道的观测施工[J].水电技术信息,1996(Z01):146-155.
[15] 褚衍玉,张聪瑞,任高峰,等.后行洞开挖对浅埋偏压小净距隧道影响研究[J].武汉理工大学学报(交通科学与工程版),2016,40(5):919-922.
[16] 曹成勇,施成华,彭立敏,等.浅埋大跨下穿高速公路隧道施工风险评估及控制措施研究[J].铁道科学与工程学报,2016,13(7):1439-1446.