长大深埋排水隧道在不同施工方法下围岩稳定性
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摘要
为研究不同施工方法下深埋排水隧道围岩变形机制及稳定性控制,利用有限差分程序FLAC3D模拟了在不同施工方法下隧道的开挖支护过程,研究了隧道支护结构的变形与应力变化规律,探索了围岩稳定性,并分析了应力场、塑性区及变形对不同围岩力学参数敏感性。研究结果表明,在不同施工方法下排水隧道衬砌按抗压及抗拉验算均是安全的,且最大拉应力主要集中在拱底上;采用全断面法施工时围岩的竖向位移和水平位移最小;衬砌应力及围岩变形对弹性模量最敏感,黏聚力和内摩擦角对塑性区影响较大。
In this paper,the deformation and stress variation of tunnel lining are studied by using finite difference program FLAC3 D,and the mechanical response characteristics of surrounding rock are explored. Besides,the sensitivity of stress field,plastic zone and deformation to different mechanical parameters of surrounding rock is analyzed. The results indicate that under different construction methods,the lining of drainage tunnel is safe according to the pressure and tensile calculation,and the maximum tensile stress is mainly concentrated on the bottom arch. The maximum vertical and horizontal displacements of surrounding rock are the smallest when constructed by full section method.Lining stress and surrounding rock deformation are most sensitive to elastic modulus,and the adhesion force and friction angle have great influence on plastic zone.
In this paper,the deformation and stress variation of tunnel lining are studied by using finite difference program FLAC3 D,and the mechanical response characteristics of surrounding rock are explored. Besides,the sensitivity of stress field,plastic zone and deformation to different mechanical parameters of surrounding rock is analyzed. The results indicate that under different construction methods,the lining of drainage tunnel is safe according to the pressure and tensile calculation,and the maximum tensile stress is mainly concentrated on the bottom arch. The maximum vertical and horizontal displacements of surrounding rock are the smallest when constructed by full section method.Lining stress and surrounding rock deformation are most sensitive to elastic modulus,and the adhesion force and friction angle have great influence on plastic zone.
引文
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[2]张镜剑,傅冰骏.岩爆及其判据和防治[J].岩石力学与工程学报,2008,27(10):2034-2042.
[3]邱道宏,陈剑平,张秉鹤,等.深埋长大公路隧道岩爆预测及防治研究[J].地下空间与工程学报,2006,2(6):950-955.
[4]何满潮,谢和平,彭苏萍,等.深部开采岩体力学研究[J].岩石力学与工程学报,2005,24(16):2803-2813.
[5]韩瑞庚.地下工程新奥法[M].北京:科学出版社,1987.
[6]原先凡,刘兆勇,郑志龙.陡立薄层岩体隧洞围岩失稳机理及支护研究[J].地下空间与工程学报,2017(S2):336-340.
[7]王伟锋,毕俊丽.软岩浅埋隧道施工工法比选[J].岩土力学,2007(S1):430-436.
[8]周宗青,李术才,李利平,等.导洞超前开挖施工性态空间效应分析[J].岩石力学与工程学报,2014(S1):2611-2619.
[9]贾剑青,李晶,张宪,等.深埋隧道围岩及支护结构稳定性分析[J].地下空间与工程学报,2013,9(6):1293-1297.
[10]李力.三台阶法与CRD法对隧道围岩稳定性影响的研究[J].公路工程,2012,37(6):138-142.
[11]徐晨.深埋硬岩隧道开挖稳定性及柔性防护网快速施工工法研究[D].成都:西南交通大学,2017.
[12]谢和平,高峰,鞠杨,等.深部开采的定量界定与分析[J].煤炭学报,2015,40(1):1-10.
[13]蒋树屏,李建军.公路隧道前置式洞口工法的三维数值分析[J].岩土工程学报,2007,29(4):484-489.
[14]黄书岭,冯夏庭,张传庆.岩体力学参数的敏感性综合评价分析方法研究[J].岩石力学与工程学报,2008,27(1):2624-2630.
[15]张志华,周传波,夏志强,等.地铁隧道土体参数敏感性分析与正交反演[J].中南大学学报(自然科学版),2013,44(6):2488-2493.