土岩组合地层暗挖地铁车站参数优化研究
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摘要
青岛地铁车站均为土、岩组合地层,车站大部分在风化程度不同的岩层中,因此研究土岩组合地层中暗挖法车站的合理埋深及结构参数有一定意义。以青岛地铁五四广场站为例,采用数值模拟方法,利用有限元软件Abaqus,结合强度折减法和结构安全系数方法,探讨暗挖车站稳定性的影响因素。通过对车站埋深、衬砌强度及应力释放率正交设计优化模拟,得出埋深影响车站围岩结构的稳定性最大,其次是衬砌强度和应力释放率。通过分析,对结构及施工参数进行了优化,优化方案的车站围岩安全系数为1.69,结构安全系数有足够的余度。
There are many differences in metros between those in Qingdao and most other domestic cities,the differences are mainly embodied in the different geological environment.Geological environment of most cities is soft soil or rock stratum of strong weathering,while strata in Qingdao are rock-soil combination.Study on rational depth and structure parameter of tunnelling method around subway station of different degree of weathering has certain significance.Based on May 4th Square Station project,Qingdao city,using numerical simulation method with finite elements software Abaqus combined with strength reduction and structure safety coefficient,to discuss the influence factors of stability of station.By specific analysis on simulations through orthogonal design about buried depth,lining strength and the stress release rate,the results obtained show that the largest factor is the buried depth,followed by lining strength and the minimum one is stress release rate.After analysing,the optimization of structure and construction parameters shows that at the rock safety coefficient of 1.69,the safety coefficient for the structure is redundant.
There are many differences in metros between those in Qingdao and most other domestic cities,the differences are mainly embodied in the different geological environment.Geological environment of most cities is soft soil or rock stratum of strong weathering,while strata in Qingdao are rock-soil combination.Study on rational depth and structure parameter of tunnelling method around subway station of different degree of weathering has certain significance.Based on May 4th Square Station project,Qingdao city,using numerical simulation method with finite elements software Abaqus combined with strength reduction and structure safety coefficient,to discuss the influence factors of stability of station.By specific analysis on simulations through orthogonal design about buried depth,lining strength and the stress release rate,the results obtained show that the largest factor is the buried depth,followed by lining strength and the minimum one is stress release rate.After analysing,the optimization of structure and construction parameters shows that at the rock safety coefficient of 1.69,the safety coefficient for the structure is redundant.
引文
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[3]王晓形.浅埋洞室围岩压力若干问题研究[D].上海:同济大学,2006.(Wang Xiaoxing.Research onsome problems of rock pressure of caverns at shallowdepth[D].Shanghai:Tongji University,2006.(in Chi-nese))
[4]陈晓婷.富水砂卵石地层条件下浅埋暗挖法隧道设计与施工对策[D].成都:西南交通大学.2006.(Chen Xiaoting.Tunnel designing and constructioncountermeasure using the mining method for shallow tun-nels on the condition of water-enriched and gravel layer[D].Chengdu:Southwest Jiaotong University,2006.(inChinese))
[5]孙辉.黄土连拱隧道围岩与支护结构稳定性研究[D].重庆:重庆大学,2005.(Sun Hui.Study on sta-bility of the rock and the liner structure in the loessdoubled-arch tunnel[D].Chongqing:Chongqing Univer-sity,2005.(in Chinese))
[6]肖强,郑颖人,叶梅林.静力无衬砌黄土隧洞稳定性探讨[J].地下空间与工程学报,2010,6(6):1136-1 141.(Xiao Qiang,Zheng Yingren,Ye meilin.Stabil-ity analysis of static unlined loess tunnel[J].ChineseJournal of Underground Space and Engineering,2010,6(6):1 136-1 141.(in Chinese))
[7]郑颖人,肖强,叶梅林,等.地震隧洞稳定性分析探讨[J].岩石力学与工程学报,2010,2(6):1081-1088.(Zheng Yingren,Xiao Qiang,Ye Meilin,et al.Study oftunnel stability analysis with seismic load[J].ChineseJournal of Rock Mechanics and Engineering,2010,2(6):1 081-1 088.(in Chinese))
[8]柴柏龙,李晓红,卢义玉,等.大跨度隧道围岩-支护体系稳定性分析[J].地下空间与工程学报,2009,21(3):510-514.(Chai Bolong,Li Xiaohong,Lu Yiyu,etal.Stability analysis of surrounding rock-supports struc-ture of large-span tunnels[J].Chinese Journal of Un-derground Space and Engineering,2009,21(3):510-514.(in Chinese))
[9]陶连金,蒯本秋,张波.松散软岩巷道破坏的颗粒离散元模拟分析[J].地下空间与工程学报,2010,5(2):318-322.(Tao Lianjin,Kuai Benqiu,Zhang Bo.The fracture mechanism analysis of loose soft roadway bydiscrete element method[J].Chinese Journal of Under-ground Space and Engineering,2010,5(2):318-322.(in Chinese))
[10]青岛市地铁一期工程(3号线)工程勘察报告[R].青岛,2009.(Engineering survey report of first phase of theproject(Line 3)around Qingdao Metro[R].Qingdao,2009.(in Chinese))
[11]郑颖人,赵尚毅,宋雅坤.有限元强度折减法研究进展[J].后勤工程学院学报,2005,21(3):1-6.(ZhengYingren,Zhao Shangyi,Song Yakun.Advance of studyon the strength reduction finite element method[J].Journal of Logistical Engineering University,2005,21(3):1-6.(in Chinese))
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