考虑地下水渗流影响的衬砌隧洞弹塑性分析
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摘要
考虑地下水渗流场的作用,将含水围岩作为两相介质体,视外水压力为渗透水作用在围岩和衬砌应力场中的体积力,分别考虑围岩与衬砌的渗透系数,并基于岩体应变非线性软化特征,对衬砌隧洞进行弹塑性分析,得到了渗流场作用下围岩与衬砌的应力和位移解析计算式,并得到围岩开始产生屈服的极限应力。计算表明,当考虑渗透水压力作用时,围岩径向应力和切向应力都增大,并使围岩塑性区扩展;当隧洞围岩、衬砌材料的渗透系数差异显著时,不能简化为等渗透系数处理。
As a porous medium,rocks are affected by under-ground water permeation.The seepage stress fieldshould be added to stress field.According to strain nonlinear softening constitutive model,the stress distribution laws,plastic zone,and the displacements of surrounding rock and liner are obtained.The critical stress leading to the yield zone firstly for the surrounding rock is introduced.The results show that the radial stress and tangential stress with considering the influence of seepage water pressure are larger than those without considering the influence,and this makes the plastic zone of surrounding rock expands.When the seepage factors of surrounding rock and liner are obviously different,they are not simplied as one and the same.
As a porous medium,rocks are affected by under-ground water permeation.The seepage stress fieldshould be added to stress field.According to strain nonlinear softening constitutive model,the stress distribution laws,plastic zone,and the displacements of surrounding rock and liner are obtained.The critical stress leading to the yield zone firstly for the surrounding rock is introduced.The results show that the radial stress and tangential stress with considering the influence of seepage water pressure are larger than those without considering the influence,and this makes the plastic zone of surrounding rock expands.When the seepage factors of surrounding rock and liner are obviously different,they are not simplied as one and the same.
引文
[1]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2002.
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[8]李忠华,潘一山.有渗流作用的油井井壁稳定性分析[J].工程力学,2002,19(3):105-108.
[9]荣传新,程桦.地下水渗流对巷道围岩稳定性影响的理论解[J].岩石力学与工程学报,2004,23(5):41-744.
[10]贾乃文.粘塑性力学及工程应用[M].北京:地震出版社,2000.
[2]徐干成,白洪才,郑颖人,等.地下工程支护结构[M].北京:中国水力水电出版社,2002.
[3]潘岳,王志强.基于应变非线性软化的圆形硐室围岩弹塑性分析[J].岩石力学与工程学报,2005,24(6):915-920.
[4]张有天,张武功.隧洞水荷载的静力计算[J].水利学报,1980,(3):52-62.
[5]张有天,张武功,王镭.再论隧洞水荷载的静力计算[J].水利学报,1985,(3):22-32.
[6]蔡晓鸿,蔡勇平.水工压力隧洞结构应力计算[M].北京:中国水利水电出版社,2004.
[7]李敬元,李子丰.渗流作用下井筒周围岩石弹塑性应力分布规律及井壁稳定条件[J].工程力学,1997,14(2):131-137.
[8]李忠华,潘一山.有渗流作用的油井井壁稳定性分析[J].工程力学,2002,19(3):105-108.
[9]荣传新,程桦.地下水渗流对巷道围岩稳定性影响的理论解[J].岩石力学与工程学报,2004,23(5):41-744.
[10]贾乃文.粘塑性力学及工程应用[M].北京:地震出版社,2000.
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