强震作用下支护-结构一体化管幕预制法地铁车站地震响应研究

Seismic Response of the Metro Station with Pre-constructed Pipe-roof Integrating Support and Structure under Strong Earthquake Effect

地下工程支护-结构一体化管幕预筑法是一种全新的暗挖施工方法,改变了传统暗挖法先加固、后支护、最后施作主体结构的施工步序,将加固、支护、主体结构合为一体并一次建造成型。目前有关地下结构抗震问题方面的研究主要以分析传统施工工艺施作而成的地下结构地震响应问题为主,缺少对地下大断面管幕预筑法结构的抗震研究。文章基于有限差分软件FLAC^3D,研究了管幕预筑法地铁车站的地震响应规律,结果表明:(1)在强震作用下,沿管幕车站结构高度各测点相对水平位移呈倒S型规律;(2)地震作用下车站结构应力值相对较大的位置主要集中在各管幕的连接处、中板与管幕的连接处、管幕与底板连接处;(3)与单向地震作用相比较,双向地震作用下车站结构的加速度和最大水平应力值均有所增加,水平位移、相对水平位移有所减小。

Support-structure integrated pipe-roof pre-construction method is a new mined construction method integrating reinforcement,supporting and major structure.At present the aseismic research on underground structure mainly involves in analyzing the seismic response of underground structure built by traditional construction technology and there is few seismic research of structure by large-section pipe-roof pre-construction method.Based on finite difference software FLAC^3D,it studied the seismic response of metro station by pipe-roof pre-construction method.The results show that relative horizontal displacement of various measuring points along the height of station structure is in a shape of inversed S under the effect of strong earthquake;large stress of station structure under effect of earthquake often occurs at the junctions of various pipe-roofs,middle plate and pipe-roof as well as piperoof and base;compared with that under unidirectional earthquake effect,the acceleration and max.horizontal stress of station structure both increase and horizontal displacement and relative horizontal displacement decrease under bidirectional earthquake effect.