基于流固耦合的高压混凝土隧洞衬砌结构配筋研究及应用
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摘要
当采用面力理论计算新疆阿尔塔什水利枢纽工程的发电引水隧洞的配筋量时,衬砌含筋量巨大,与实际情况不符合。对此,采用岩体弹塑性渗流—应力—损伤耦合模型,将动态变化的体积力施加于整个模型,得出混凝土衬砌应变情况,根据衬砌应力按照现行规范进行限裂配筋。计算得出了围岩、衬砌的渗流场、应力场和相应的水力梯度以及最高外渗水头。结果表明,考虑流固耦合下的高压隧洞衬砌应力小于面力理论计算的成果,且前者计算出的混凝土衬砌配筋量远小于后者的计算结果。研究成果可为类似隧洞设计提供参考。
Due to huge amount of steel lining,the amount of reinforcement calculation for power generation tunnel diversion tunnel of Xinjiang ART water conservancy project obtained by the theory of surface force is not consistent with the actual situation.Therefore,the rock elastic-plastic seepage-stress-damage coupling model was used to determine the strain of concrete lining by imposing the dynamic change of volume force on the whole model.Based on the current specification,lining crack reinforcement was implemented in term of lining stress.The seepage field,stress field and the corresponding hydraulic gradient and the highest water leakage of the surrounding rock and lining were calculated.The results show that the stress of the tunnel lining under the fluid solid coupling is less than the theoretical calculation results of the surface force,and the former of calculation results of concrete lining reinforcement are much smaller than the latter.The research results can provide reference for similar design of high pressure tunnel.
Due to huge amount of steel lining,the amount of reinforcement calculation for power generation tunnel diversion tunnel of Xinjiang ART water conservancy project obtained by the theory of surface force is not consistent with the actual situation.Therefore,the rock elastic-plastic seepage-stress-damage coupling model was used to determine the strain of concrete lining by imposing the dynamic change of volume force on the whole model.Based on the current specification,lining crack reinforcement was implemented in term of lining stress.The seepage field,stress field and the corresponding hydraulic gradient and the highest water leakage of the surrounding rock and lining were calculated.The results show that the stress of the tunnel lining under the fluid solid coupling is less than the theoretical calculation results of the surface force,and the former of calculation results of concrete lining reinforcement are much smaller than the latter.The research results can provide reference for similar design of high pressure tunnel.
引文
[1]苏凯,伍鹤皋,周创兵.内水压力下水工隧洞衬砌与围岩承载特性研究[J].岩土力学,2010,31(8):2 407-2 412.
[2]叶冀升.广州抽水蓄能电站建设的科技进步成果[J].水力发电学报,1998(3):84-94.
[3]叶冀升.广蓄电站水工隧洞设计施工的若干问题[J].水力发电学报,1998(2):38-49.
[4]杨林德,丁文其.渗水高压引水隧洞衬砌的设计研究[J].岩石力学与工程学报,1997,16(2):112-117.
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[6]李培超,孔祥言,卢德唐.饱和多孔介质流固耦合渗流的数学模型[J].水动力学研究与进展:A辑,2003,18(4):419-426.
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[8]李培超,李贤桂,卢德唐.饱和土体一维固结理论的修正——饱和多孔介质流固耦合渗流模型之应用[J].中国科学技术大学学报,2010,40(12):1 273-1 278.
[9]冉启全,李士伦.流固耦合油藏数值模拟中物性参数动态模型研究[J].石油勘探与开发,1997,24(3):61-65,100.
[10]张巍,黄立财.基于渗流场与应力场耦合的高压隧洞设计[J].水利与建筑工程学报,2007,5(2):41-44.
[11]张巍,黄立财,陈世玉.透水衬砌设计理论在惠蓄高压隧洞设计中的应用[J].广东水利水电,2008(7):20-23.
[12]张巍,黄立财,陈世玉.高压钢筋混凝土隧洞透水衬砌设计理论的进一步研究[J].广东水利水电,2009(9):1-4,18.
[13]张巍,黄立财,刘林军.考虑围岩约束高压隧洞衬砌结构限裂计算的理论探讨[J].水力发电,2013,39(10):23-25,40.
[14]李新星,蔡永昌,庄晓莹,等.高压引水隧洞衬砌的透水设计研究[J].岩土力学,2009,30(5):1 403-1 408.
[15]SL279-2016,水工隧洞设计规范[S].北京:中国水利水电出版社,2016.
[16]DL/T 5195-2004,水工隧洞设计规范[S].北京:中国电力出版社,2004.
[2]叶冀升.广州抽水蓄能电站建设的科技进步成果[J].水力发电学报,1998(3):84-94.
[3]叶冀升.广蓄电站水工隧洞设计施工的若干问题[J].水力发电学报,1998(2):38-49.
[4]杨林德,丁文其.渗水高压引水隧洞衬砌的设计研究[J].岩石力学与工程学报,1997,16(2):112-117.
[5]苏凯,伍鹤皋,韩前龙.高压透水隧洞工作机理探讨[J].水利水电技术,2005,36(6):61-64.
[6]李培超,孔祥言,卢德唐.饱和多孔介质流固耦合渗流的数学模型[J].水动力学研究与进展:A辑,2003,18(4):419-426.
[7]徐献芝,李培超,李传亮.多孔介质有效应力原理研究[J].力学与实践,2001,23(4):42-45.
[8]李培超,李贤桂,卢德唐.饱和土体一维固结理论的修正——饱和多孔介质流固耦合渗流模型之应用[J].中国科学技术大学学报,2010,40(12):1 273-1 278.
[9]冉启全,李士伦.流固耦合油藏数值模拟中物性参数动态模型研究[J].石油勘探与开发,1997,24(3):61-65,100.
[10]张巍,黄立财.基于渗流场与应力场耦合的高压隧洞设计[J].水利与建筑工程学报,2007,5(2):41-44.
[11]张巍,黄立财,陈世玉.透水衬砌设计理论在惠蓄高压隧洞设计中的应用[J].广东水利水电,2008(7):20-23.
[12]张巍,黄立财,陈世玉.高压钢筋混凝土隧洞透水衬砌设计理论的进一步研究[J].广东水利水电,2009(9):1-4,18.
[13]张巍,黄立财,刘林军.考虑围岩约束高压隧洞衬砌结构限裂计算的理论探讨[J].水力发电,2013,39(10):23-25,40.
[14]李新星,蔡永昌,庄晓莹,等.高压引水隧洞衬砌的透水设计研究[J].岩土力学,2009,30(5):1 403-1 408.
[15]SL279-2016,水工隧洞设计规范[S].北京:中国水利水电出版社,2016.
[16]DL/T 5195-2004,水工隧洞设计规范[S].北京:中国电力出版社,2004.