【摘要】：為探討不同斷層走向下隧道在地震作用時的響應(yīng)規(guī)律及破壞機理,開展了振動臺模型試驗及數(shù)值分析,研究了隧道的加速度反應(yīng)、動應(yīng)變及圍巖動土壓力的變化規(guī)律和隧道的動態(tài)破壞形態(tài)。分析結(jié)果表明:地震下隧道襯砌將受較大的拉、壓作用,尤其穿越斷層處隧道襯砌張拉裂縫分布數(shù)量多、復(fù)雜,多集中于拱腳、拱肩和仰拱;隧道各部位的加速度和動應(yīng)變的時程變化規(guī)律與輸入的地震加速度時程曲線基本保持一致,說明隧道在地震過程中保持整體運動性,但斷層對地震動力反應(yīng)具有一定的放大效應(yīng),且隨著斷層走向與隧道夾角減小而更加明顯;動土壓力伴隨地震荷載作用呈現(xiàn)動力時程變化規(guī)律,動土壓力幅值整體呈"兩側(cè)大、頂?shù)仔?的規(guī)律,且斷層走向?qū)λ淼绖油翂毫τ绊戄^大。研究結(jié)果可為隧道的抗震設(shè)計和施工提供參考,具有重要的實際工程意義。
[Abstract]:In order to study the response law and failure mechanism of tunnel under different fault strike, shaking table model test and numerical analysis were carried out, and the acceleration response of tunnel was studied. The variation of dynamic strain and dynamic earth pressure of surrounding rock and the dynamic failure pattern of tunnel. The results show that the tunnel lining will be subjected to large tension and compression under earthquake, especially the tensile cracks in tunnel lining will be distributed in a large number, complex and concentrated on arch foot, arch shoulder and inverted arch. The time-history variation of the acceleration and dynamic strain in every part of the tunnel is basically consistent with the input seismic acceleration curve, which indicates that the tunnel maintains the overall motion during the earthquake. However, the fault has a certain magnification effect on seismic dynamic response, and becomes more obvious with the decrease of the angle between fault strike and tunnel, and the dynamic time history of the dynamic earth pressure accompanied by the earthquake load appears, and the amplitude of the dynamic earth pressure is large on both sides. The rule of "small top and bottom" and fault strike have great influence on the dynamic earth pressure of tunnel. The results can provide reference for the seismic design and construction of the tunnel, and have important practical significance.
【作者單位】： 重慶交通大學(xué)土木工程學(xué)院;后勤工程學(xué)院軍事土木工程系;
【基金】：重慶市基礎(chǔ)科學(xué)與前沿技術(shù)研究專項資助(cstc2015jcyj A30017) 江西省交通運輸廳科技項目(2014Y0009) 重慶市教委科學(xué)技術(shù)研究項目(KJ1500534)
【分類號】：U451.5

【相似文獻】

相關(guān)期刊論文 前1條

1 鄒炎;景立平;李永強;;隧道穿過土層分界面振動臺模型試驗研究[J];巖石力學(xué)與工程學(xué)報;2014年S1期

相關(guān)碩士學(xué)位論文 前1條

1 張繼偉;近海斜拉橋單塔結(jié)構(gòu)振動臺模型試驗研究[D];大連理工大學(xué);2016年

，

本文編號：2286857