摘要
为分析某大型输水工程穿越不良地质条件段的盾构双层长距离输水隧洞的地震响应,对外衬预制管片提出一种非线性接触模型,由于其接触面具有抗压不抗拉的特性,同时采用广义梁单元模拟以传递拉应力和剪应力为主的联接螺栓的力学特性,并通过算例论证了该方法的合理性。分析中考虑了内外衬之间的联合受力范围、外衬与岩土体之间及隧道内水体与内衬之间的动力相互作用,以及地基的辐射阻尼效应,采用整体模型与局部子模型相结合的方法研究了穿越不良地质段的输水隧洞复杂地质条件对隧洞衬砌结构地震响应的影响。结果表明,不良的地质条件使得隧洞衬砌环间接缝变形及螺栓应力显著增加,但该工程隧洞结构纵向抗震稳定性仍满足安全要求。
To analyze the seismic response of a shield double-layer long-distance water conveyance tunnel that passes through a section of poor geological conditions for a large-scale water conveyance project, a non-linear contact model was proposed for the externally lined prefabricated segments. The contact surface has the characteristics of compressive and non-tensile resistance. At the same time, the generalized beam element was used to simulate the mechanical characteristics of the connecting bolts that mainly transmit tensile and shear stresses. An example was used to demonstrate the rationality of this method. The combined force range between the inner lining and the outer lining, the dynamic interaction between the outer lining and the rock and soil, the water in the tunnel and the inner lining, and the radiation damping effect of the foundation were considered. The overall model and the combined method of local sub-models were used to study the impact of complex geological conditions of long-distance water conveyance tunnels on the seismic response of tunnel lining structures. The research results show that poor geological conditions have significantly increased the deformation of the joints of the tunnel lining ring and the bolt stress. Nevertheless, the longitudinal seismic stability of the tunnel structure of the project still meets the safety requirements.
作者
徐喆成
周耀强
刘灿平
刘晓青
XU Zhe-cheng;ZHOU Yao-qiang;LIU Can-ping;LIU Xiao-qing(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Guangdong Yuehai Pearl River Delta Water Supply Co.,Ltd.,Guangzhou 511455,China)
出处
《水电能源科学》
北大核心
2022年第7期119-123,共5页
Water Resources and Power
基金
国家重点研发计划(2018YFC0407102)
珠江三角洲水资源配置工程科研项目(CD88-GC02-2020-0058)。
关键词
长距离输水隧洞
不良地质条件
非线性接触
双层衬砌
地震响应
long-distance water conveyance tunnel
poor geological conditions
nonlinear contact
double-layer lining
seismic response
