OPTIMIZATION ANALYSIS OF CONSTRUCTION METHOD FOR SHALLOW-BURIED TUNNEL WITH LARGE SECTION
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摘要: 为了探索适合青岛胶州湾海底隧道陆域大断面段施工过程中的最合理施工工法,采用三维有限差分软件FLAC3D对4种常用施工工法进行数值计算优化分析,分析结果表明:双侧壁导坑法即眼镜法对地表沉降、洞周收敛和围岩稳定的影响方面要优于其他工法,而CD法施工主要对衬砌安全方面效果最佳。在实际施工过程中,综合考虑施工工期、进度、隧道埋深、洞径等,选择最佳施工工法。由于青岛海底隧道陆域大断面段隧道跨度较大,净空高,开挖台阶也高,致使钢支撑质量较大,安装困难,不宜使用CD法,最终确定选择双侧壁导坑法施工。通过实际工程验证,双侧壁导坑法在青岛胶州湾海底隧道陆域大断面段取得了显著的社会、经济效益,为今后类似工程对于该种工法的应用起到了很好的借鉴和指导作用。Abstract: In order to find the most reasonable construction method for the Qingdao Jiaozhou Bay subsea tunnel withlarge section in land area, numerical simulation for the four kinds of common construction methods had been made bythree-dimension finite differential software FLAC3 D.The analytical results indicate that the double side headingmethod is better in the surface settlement, tunnel deformation and stability of surrounding rock than the other threemethods.The DC construction method is more beneficial to the lining safety than the others.In the actual process ofconstruction, it should be comprehensively considered lots of the factors including the construction period, schedule, tunnel depth, tunnel diameter and so on in the selection of construction method.It' s difficult to install the steelsupport because of the big span, high clearance and bench in Qingdao subsea tunnel with large section in land area.The CD method should not be used in the construction and the double side heading method is the best selection takinginto account all the factors.The double side heading method has achieved significant social and economic benefits inthe Qingdao Jiaozhou Bay subsea tunnel with large section in land area and will play a very good reference andguidance for similar projects in the future.
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姚直书,蔡海兵,程桦,等.采用长距离水平冻结暗挖法的浅埋大断面地铁隧道施工技术[J].中国铁道科学,2011,32(1):75-80. [2] 唐国荣,刘招伟,李建华.城市富水砂卵石地层大断面隧道浅埋暗挖工法研究[J].中国工程科学,2010,12(12):98-102. [3] 黄明利,路威,徐恒国,等.大断面海底隧道软弱地层施工方法研究[J].中国工程科学,2009,11(7):35-38. [4] 关宝树.隧道工程设计要点集[M].北京:人民交通出版社,2003. [5] 魏纲.盾构隧道深层土体沉降槽宽度系数计算方法研究[J].公路交通科技,2010,27(4):110-115. [6] 魏纲.盾构法隧道地面沉降槽宽度系数取值的研究[J].工业建筑,2009,39(12):74-79. [7] 唐军峰,徐国元,唐雪梅,等.复杂开挖条件下大断面洞室围岩的变形及力学特性研究[J].地质力学学报,2009,15(3):233-244. [8] 王明年,路军富,张建国,等.大断面海底隧道施工安全判定基准及应用[J].岩土工程学报,2010,32(6):867-873. [9] 喻言,柳群义,冯德山.隧道岩体稳定性的非线性单元安全系数分析[J].中南大学学报,2010,41(3):1085-1089. [10] 舒谷生,彭文祥,何忠明,等.岩体稳定性评价的单元安全系数法及其影响因素分析[J].科技导报,2009,27(16):66-68. [11] 邵冠慧,李晓昭,赵晓豹,等.基于块体理论安全系数的隧道优化设计[J].工程地质学报,2010,18(4):581-585. [12] 宋战平,荆敏,韩日美,等.基于强度安全系数概念的隧道衬砌结构优选设计[J].西安建筑科技大学学报,2010,42(4):499-503.
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