摘要
为研究支护结构对非均匀应力场下圆形隧道的力学特性尤其是围岩塑性区的影响,采用理论分析的方法对已有模型仅能单独考虑原位非均匀应力场或支护结构对隧道围岩塑性区影响的不足展开研究,提出了一种考虑实际施工过程的非均匀应力场下圆形隧道围岩塑性区计算新方法,该方法能够很好地考虑围岩与支护结构的相互作用机理。利用该方法重点研究了隧道围岩初始位移及支护结构刚度对隧道围岩塑性区的影响,结果表明:(1)随着围岩初始位移的增加,围岩塑性区将呈现非线性增加,而当其增加到一定程度时,围岩塑性区增加幅度将十分显著;(2)随着支护结构刚度的增加,围岩塑性区将逐渐减小,但其减小幅度不是很大。因此在实际工程中,应选用合适的支护结构刚度以达到安全和经济的目的。
In order to study the influence of the support structure on the mechanical behavior,especially the surrounding rock plastic zone of the circular tunnel under non-uniform stress field,a study is carried out on the deficiency of the existing models that only the influences from the in situ non-uniform stress field or the support structure on the surrounding rock plastic zone of the tunnel are considered,and then a new calculation method with the consideration of the surrounding rock plastic zone of the circular tunnel under non-uniform stress field during the actual construction is put forward,which can better consider the mechanism of the interaction between the surrounding rock and the support structure.By means of this method,the influences from the initial displacement of the tunnel surrounding rock and the stiffness of the support structure on the tunnel surrounding rock plastic zone are emphatically studied,from which the results show that(1)along with the increase of the initial displacement of the surrounding rock,the surrounding rock plastic zone is to exhibit an non-linear increase,while the increasing amplitude of the surrounding plastic zone is to be quite significant when it increases to a certain extent;(2)along with the increase of the stiffness of the support structure,the surrounding plastic zone is to be gradually decreased,but its decreasing amplitude is not so larger.Therefore,a suitable support structure stiffness is to be selected and adopted during the actual construction,so as to get the targets of both safety and economy.
作者
王中明
朱月健
李楷兵
WANG Zhongming;ZHU Yuejian;LI Kaibing(Architecture Engineering College, Huanghuai University, Zhumadian 463000, Henan, China;Henan Province Second Building Engineering Development Co., Ltd., Xinxiang 453000, Henan, China;Beijing Rongchuangkehong Geotechnical Engineering Co., Ltd., Beijing 100083, China)
出处
《水利水电技术》
北大核心
2020年第11期197-204,共8页
Water Resources and Hydropower Engineering
基金
国家重点研发计划(2019YFC1509701)。
关键词
非均匀应力场
圆形隧道
围岩塑性区
围岩-支护结构相互作用
支护结构刚度
围岩初始径向弹性位移
non-uniform stress filed
circular tunnel
surrounding rock plastic zone
interaction between surrounding rock and support structure
support structure stiffness
initial elastic displacement of surrounding rock
