石膏围岩隧道衬砌结构破坏模式及时变可靠度模型
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摘要
石膏围岩具有很强的膨胀性和腐蚀性,在隧道全寿命周期内均会引起衬砌结构自身强度劣化及受力增加,严重影响隧道二次衬砌结构可靠性.针对石膏围岩膨胀特性和腐蚀性对隧道二次衬砌结构的影响分别建立了二次衬砌结构膨胀破坏模式和腐蚀破坏模式;考虑石膏围岩膨胀性和腐蚀性对隧道衬砌结构的综合影响,建立了石膏围岩隧道二次衬砌结构综合破坏模式;基于结构体功能函数,推导出能够初步考虑围岩膨胀性和腐蚀性的隧道衬砌结构可靠度指标计算公式;并分别建立了三种破坏模式下的时变可靠度分析模型.采用石膏围岩隧道衬砌结构综合破坏模式下的时变可靠度模型对礼让隧道进行了分析,得到其在使用寿命100 a内的可靠度指标变化规律.根据计算结果可以优化石膏围岩隧道衬砌结构的抗腐蚀、抗膨胀和支护结构设计参数,并对石膏围岩隧道使用寿命周期内的合理维护及维修提供依据.研究成果可推广应用于隧道衬砌结构的可靠度研究中.
Gypsum rock is strongly corrosive and expansive,which can cause significant deterioration in the lining structure and the strength over the life sysle of a geologic tunnel. It would seriously affect the reliability of the tunnel lining structure reliability and negatively impact complex structural rules. In this reported study,the expansion failure and corrosion failure modes of the lining structure were established according to the influence of the expansive character and the corrosivity of the gypsum wall rock on the tunnel lining structure. Based on the combined effects of swelling and the corrosivity of gypsum on the tunnel lining structure,a comprehensive failure mode for the gypsum rock tunnel lining structure was established. Based on the structural functions,a derived reliability index formula for the tunnel lining structure based on the swelling and erosion of surrounding rock was established. A reliability analysis model of the gypsum in three failure modes was instituted. Based on the failure mode of the surrounding gypsum rock,the time-dependent reliability model of Lirang tunnel was analyzed,and a rule for the reliability index in a life span over a period of 100 years was obtained. According to the calculated results,the corrosion resistance,anti-swelling and supporting structure design parameters of the tunnel lining structure of gypsum rock could be optimized,and rational maintenance and repair of the gypsum rock tunnel life-cycle was provided. The research results can be applied to reliability research of tunnel lining structures.
Gypsum rock is strongly corrosive and expansive,which can cause significant deterioration in the lining structure and the strength over the life sysle of a geologic tunnel. It would seriously affect the reliability of the tunnel lining structure reliability and negatively impact complex structural rules. In this reported study,the expansion failure and corrosion failure modes of the lining structure were established according to the influence of the expansive character and the corrosivity of the gypsum wall rock on the tunnel lining structure. Based on the combined effects of swelling and the corrosivity of gypsum on the tunnel lining structure,a comprehensive failure mode for the gypsum rock tunnel lining structure was established. Based on the structural functions,a derived reliability index formula for the tunnel lining structure based on the swelling and erosion of surrounding rock was established. A reliability analysis model of the gypsum in three failure modes was instituted. Based on the failure mode of the surrounding gypsum rock,the time-dependent reliability model of Lirang tunnel was analyzed,and a rule for the reliability index in a life span over a period of 100 years was obtained. According to the calculated results,the corrosion resistance,anti-swelling and supporting structure design parameters of the tunnel lining structure of gypsum rock could be optimized,and rational maintenance and repair of the gypsum rock tunnel life-cycle was provided. The research results can be applied to reliability research of tunnel lining structures.
引文
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[13]Xu J,Zheng Y R.Elastoplastic stochastic finite element analysis of surrounding rock of tunnel and its application to reliability calculation.Rock Soil Mech,2003,24(1):70(徐军,郑颖人.隧道围岩弹塑性随机有限元分析及可靠度计算.岩土力学,2003,24(1):70)
[14]Xu C D,Hou H M,Zhang P.Study on the mechanism of sulfate attack on hydraulic concrete structures in irrigation area.China Rural Water Hydropower,2009(2):53(徐存东,侯慧敏,张鹏.灌区水工混凝土建筑物受硫酸盐侵蚀破坏机理研究.中国农村水利水电,2009(2):53)
[15]Liu X D,Hao J P.Continuum Damage Mechanics.Beijing:National Defend Industry Press,2011(刘新东,郝际平.连续介质损伤力学.北京:国防工业出版社,2011)
[16]Zhu X R,Fang P F,Huang H M.Research on super-long pile in soft clay.Chin J Geotech Eng,2003,25(1):76(朱向荣,方鹏飞,黄洪勉.深厚软基超长桩工程性状试验研究.岩土工程学报,2003,25(1):76)
[17]Ministry of Housing and Urban-Rural Development,People's Republic of China.GB50010—2011 Code for Design of Concrete Structures.Beijing:China Architecture&Building Press,2011(中华人民共和国住房和城乡建设部.GB50010—2011混凝土结构设计规范.北京:中国建筑工业出版社,2011)
[2]Yan Q,Xiong J J,Qiu T.Safety factor with two-indexes of reliability and confidence levels.J Univ Sci Technol Beijing,2011,33(6):766(晏青,熊峻江,邱涛.基于可靠度与置信度的双可靠性指标安全系数方法.北京科技大学学报,2011,33(6):766)
[3]Zhao G F,Gong J X,Zhao S C.Reliability of Whole Life Process of Engineering Structure.Beijing:China Railway Publishing House,2004(赵国藩,贡金鑫,赵尚传.工程结构生命全过程可靠度.北京:中国铁道出版社,2004)
[4]Yang F F.Research on the Stability of Expansive Soil Slope of S-N Water Transfer Canal[Dissertation].Handan:Hebei University of Engineering,2014(杨芳芳.南水北调膨胀土渠道边坡稳定可靠度研究[学位论文].邯郸:河北工程大学,2014)
[5]Li D.Considering the Influence of Rainfall Infiltration on the Reliability of Expansive Soil Slopes[Dissertation].Hefei:Hefei University of Technology,2012(李丹.考虑降雨入渗影响的膨胀土边坡稳定可靠度分析[学位论文].合肥:合肥工业大学,2012)
[6]Gong W H,Zheng J J,Wang Y H.Analysis of degree of reliability of settlement of expansive soil roadbed.J Huazhong Univ Sci Technol Nat Sci Ed,2003,31(6):45(龚文惠,郑俊杰,王元汉.膨胀土路基沉降的可靠度分析.华中科技大学学报(自然科学版),2003,31(6):45)
[7]Peng J X,Shao X D,Zhang J R.Prediction of the proportion of carbonation corrosion cracking of reinforced concrete structure and the determination of its maintenance time based on time-dependent reliability.J China Foreign Highway,2010,30(5):120(彭建新,邵旭东,张建仁.基于时变可靠度的钢筋混凝土结构碳化腐蚀开裂比例预测和维护时间确定.中外公路,2010,30(5):120)
[8]Zhao Y H.Metro Stray Current Corrosion and the Influence of Corrosion on Reliability&Durability of Tunnel Structure[Dissertation].Chengdu:Southwest Jiaotong University,2006(赵宇辉.地铁杂散电流腐蚀及其对隧道结构可靠度与耐久性的影响[学位论文].成都:西南交通大学,2006)
[9]Yang S,Li X D,Miao C Y,et al.The safety and stability study of subsea tunnel lining.Sichuan Building Sci,2016,42(3):23(杨森,李秀地,苗朝阳,等.微风化围岩海底隧道衬砌安全稳定性分析.四川建筑科学研究,2016,42(3):23)
[10]Ye D F.The application of grouted hollow anchors in the tunnel excavation support.Soil Eng Found,2013,27(5):1(叶东方.中空注浆锚杆在某隧道支护中的应用.土工基础,2013,27(5):1)
[11]Li Y.Study on the Bearing Mechanism and Application of Shotcrete Bolt Support Structure[Dissertation].Nanjing:Nanjing University of Science&Technology,2009(李映.隧道喷锚支护结构承载作用机理及应用研究[学位论文].南京:南京理工大学,2009)
[12]Zhang Q Y,Yu Y T.The numerical simulation analysis of working process for pressure tunnel filled with water.Chin J Rock Mech Eng,1997,16(5):453(张强勇,俞裕泰.压力隧洞充水运行过程的数值模拟分析研究.岩石力学与工程学报,1997,16(5):453)
[13]Xu J,Zheng Y R.Elastoplastic stochastic finite element analysis of surrounding rock of tunnel and its application to reliability calculation.Rock Soil Mech,2003,24(1):70(徐军,郑颖人.隧道围岩弹塑性随机有限元分析及可靠度计算.岩土力学,2003,24(1):70)
[14]Xu C D,Hou H M,Zhang P.Study on the mechanism of sulfate attack on hydraulic concrete structures in irrigation area.China Rural Water Hydropower,2009(2):53(徐存东,侯慧敏,张鹏.灌区水工混凝土建筑物受硫酸盐侵蚀破坏机理研究.中国农村水利水电,2009(2):53)
[15]Liu X D,Hao J P.Continuum Damage Mechanics.Beijing:National Defend Industry Press,2011(刘新东,郝际平.连续介质损伤力学.北京:国防工业出版社,2011)
[16]Zhu X R,Fang P F,Huang H M.Research on super-long pile in soft clay.Chin J Geotech Eng,2003,25(1):76(朱向荣,方鹏飞,黄洪勉.深厚软基超长桩工程性状试验研究.岩土工程学报,2003,25(1):76)
[17]Ministry of Housing and Urban-Rural Development,People's Republic of China.GB50010—2011 Code for Design of Concrete Structures.Beijing:China Architecture&Building Press,2011(中华人民共和国住房和城乡建设部.GB50010—2011混凝土结构设计规范.北京:中国建筑工业出版社,2011)