本文關鍵詞：針對不同埋深的隧道振動臺試驗設計研究　出處：《重慶交通大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 隧道深淺埋 動力 地震波 振動臺 模型箱

【摘要】：隨著我國經(jīng)濟的騰飛發(fā)展,加快對西部山嶺地區(qū)的開發(fā)愈發(fā)顯得日漸緊迫,因此,我國隧道工程的建設就被帶動了起來。出于防災減災的需要,對隧道工程開展抗震設計方法的研究正逐漸得到學術界的關注,且得出了隧道埋深對其抗震性能具有明顯影響的共識。然而目前公路隧道的抗震設計規(guī)范仍然采用靜力分析方法作為劃分隧道深淺埋的依據(jù),難以充分反映地震發(fā)生時的動力特性,并且不同埋深隧道的地震作用參數(shù)和計算公式也有待修正。 計算機和數(shù)值模擬軟件的快速發(fā)展,給解決這類問題提供了一種處理辦法,且目前已提出了多種算法,然而由于各類軟件原理的不同,以及其他多種因素,經(jīng)常導致對同一項目的不同模型或計算方法得出的結果存在明顯差別,且很難判定孰是孰非。而模型試驗正是解決這一問題的有效手段,本項研究旨在采用波動理論方法,通過振動臺模型試驗,分析不同埋深隧道襯砌的地震響應規(guī)律,了解襯砌受力與其埋深之間的相互關系,以便為檢驗理論計算結果的正確性,改進計算模型和隧道動力深淺埋的劃分方法提供參考,進而為制定隧道抗震設計指南等提供依據(jù)。 針對本試驗的特點,本文通過對相似理論的分析,擬定了試驗模型相似比；通過對多種模型箱類型的對比,確立了模型箱的合理構造形式、設計布局和邊界條件的處理方式；通過對相似試驗模型材料的論證,分別得出了圍巖模型、隧道襯砌模型的相似材料及其配比；通過對試驗客觀條件的探討,確定了模型試驗中傳感器的布置原則及位置,制定出了一套行之有效的在振動臺上進行模型箱、圍巖、襯砌、傳感器的組裝、填筑、施作、布設的方案。 最終,在三種地震波共計21種工況的作用下,對處在不同埋深的襯砌模型進行了振動臺試驗。得到了以加速度時程、襯砌模型結構應變以及圍巖動態(tài)土壓應力為代表的試驗數(shù)據(jù),并依此分別得出不同埋深隧道襯砌模型的加速度放大系數(shù)、結構應力、圍巖應力的變化特征。通過對這部分數(shù)據(jù)進行分析,得出了一些數(shù)據(jù)隨埋深的突變點,為隧道深淺埋的動力劃分提供了參考。
[Abstract]:With the rapid development of China's economy development, accelerate the development of the western mountainous areas is increasingly increasingly urgent, therefore, the construction of the tunnel project in China was brought up. The need for disaster prevention and mitigation, research on seismic design method of tunnel engineering has been the academic attention, and that is obviously deep influence on the seismic performance of the tunnel. However, the current consensus on the code for seismic design of highway tunnel is still using the static analysis method as the division tunnel buried depth of foundation, difficult to fully reflect the dynamic characteristics of earthquake, earthquake parameters and calculation formula and different depth of the tunnel should be corrected.
The rapid development of computer and numerical simulation software, provides a way to solve this kind of problem, and the current various algorithms have been proposed, but due to the different principle of all kinds of software, and many other factors, there are significant differences that often lead to the same project different model or method of calculation results, and it is difficult to judge right and wrong. While the model test is an effective means to solve this problem, this study aims at using wave theory method, through the shaking table test of seismic response of different buried depth of tunnel lining, lining stress and understand the relationship between the buried depth, the correctness of the calculation results is to test the theory. An improved calculation model and the dynamic classification method of tunnel buried depth of reference, and provide the basis for the development of tunnel seismic design guidelines.
According to the characteristics of the test, based on the similarity theory analysis, model test similarity ratio was drawn up; by comparing several types of box model, establish the reasonable structure of model box, processing design layout and boundary conditions; based on the similar material model test demonstration, the model of surrounding rock are obtained, similar the material and the ratio of tunnel lining model; through the discussion on the test of objective conditions, determine the layout principles and position sensors in the model test, to develop a set of effective vibration table of model box, surrounding rock, lining, sensor assembly, filling, construction, layout scheme.
Finally, in the three kinds of seismic waves under the action of a total of 21 cases, the shaking table test model in different depth of lining are obtained. The acceleration test, data structure and lining strain model of rock dynamic soil stress as the representative, and then calculated with the buried depth of tunnel lining model the acceleration amplification coefficient, structure stress, variation characteristics of surrounding rock stress. Through this part of the data analysis, the mutation point of some data with depth, which provides a reference for the division of power tunnel buried depth.

【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U451.5

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