本文選題：淺埋隧道 + 地震響應(yīng)�。� 參考：《重慶交通大學(xué)》2014年碩士論文

【摘要】：地震災(zāi)害的影響隨著我國地下工程規(guī)模的擴(kuò)大也越來越嚴(yán)重。地下結(jié)構(gòu)比地上結(jié)構(gòu)的抗震性能佳，但是在某些薄弱部位，抗震性能卻往往得不到保證，這一點(diǎn)在淺埋隧道中尤為明顯。最近2008年的四川汶川地震和2013年的雅安蘆山地震，人們意識(shí)到山嶺隧道等地下結(jié)構(gòu)也會(huì)受到震害。而淺埋隧道對地震的動(dòng)作用最為敏感，隨著淺埋隧道越來越多，如果因?yàn)榈卣鸲饻\埋隧道大范圍的破壞，人員和經(jīng)濟(jì)損失將難以估計(jì)。因此,需要對地震動(dòng)作用下淺埋隧道結(jié)構(gòu)響應(yīng)數(shù)值分析與試驗(yàn)研究，找出地下結(jié)構(gòu)抗震設(shè)計(jì)的關(guān)鍵要點(diǎn)，為淺埋隧道結(jié)構(gòu)等地下工程結(jié)構(gòu)的優(yōu)化設(shè)計(jì)提供科學(xué)的依據(jù)。故對影響淺埋隧道地震反應(yīng)的若干因素進(jìn)行數(shù)值分析具有重要意義。本文通過振動(dòng)臺(tái)試驗(yàn)研究了地震荷載下淺埋隧道圍巖及結(jié)構(gòu)加速度變化情況，為數(shù)值模擬的結(jié)果的驗(yàn)證提供可靠參考。采用了有限元軟件Ansys對地震動(dòng)作用下隧道結(jié)構(gòu)動(dòng)力響應(yīng)建立了有限元模型，以圍巖-結(jié)構(gòu)相互作用為核心理論，通過時(shí)程分析法進(jìn)行大量計(jì)算，得到一些規(guī)律，希望能為淺埋隧道的優(yōu)化設(shè)計(jì)和地下結(jié)構(gòu)的對地震響應(yīng)提供參考，本文主要研究內(nèi)容有以下幾個(gè)方面： ①分析了當(dāng)前地下結(jié)構(gòu)發(fā)展趨勢，，總結(jié)了地下結(jié)構(gòu)抗震研究的歷史、主要方法和當(dāng)前研究的現(xiàn)狀，提出了地震動(dòng)作用下對淺埋隧道結(jié)構(gòu)響應(yīng)影響的若干因素研究的必要性和價(jià)值。 ②通過對振動(dòng)臺(tái)介紹和振動(dòng)臺(tái)試驗(yàn)的制作，從相似模型研究了地震荷載下隧道圍巖及結(jié)構(gòu)加速度變化情況，為下一步數(shù)值模擬的結(jié)果的驗(yàn)證提供可靠的參考。 ③通過對建立的計(jì)算模型采用時(shí)程分析方法，對在地震動(dòng)作用下淺埋隧道的不同參數(shù)變化產(chǎn)生的結(jié)構(gòu)響應(yīng)進(jìn)行分析，并找出規(guī)律和關(guān)鍵因素。通過建立不同的埋深、地震烈度、地質(zhì)條件、襯砌厚度、襯砌強(qiáng)度等數(shù)值模型，對于影響淺埋隧道地震響應(yīng)的多個(gè)參數(shù)進(jìn)行了分析，提出了相應(yīng)的影響模式。通過分析三維平面條件下淺埋隧道地震反應(yīng)的解析結(jié)果，提出了對淺埋隧道地震反應(yīng)特點(diǎn)的認(rèn)識(shí)。在上述理論方法和研究結(jié)果基礎(chǔ)上，進(jìn)一步對不同的襯砌材料(不同的混凝土標(biāo)號(hào)、不同的襯砌厚度和不同的襯砌強(qiáng)度)和不同的地質(zhì)條件下對淺埋隧道結(jié)構(gòu)的地震響應(yīng)進(jìn)行了探討。 ④對影響因素計(jì)算結(jié)果進(jìn)行分析并總結(jié)淺埋隧道抗減震措施的原理和方法。
[Abstract]:The impact of earthquake disasters is becoming more and more serious with the expansion of the scale of underground engineering in China. The seismic performance of the underground structure is better than that on the ground structure, but in some weak parts, the seismic performance is often not guaranteed. This is particularly evident in the shallow buried tunnel. In recent 2008, the Wenchuan earthquake in Sichuan and the Lushan earthquake in Ya'an in 2013, people We realize that the underground structures, such as the mountain tunnel, are also affected by the earthquake, and the shallow tunnel is most sensitive to the earthquake action. With the increasing number of shallow buried tunnels, it is difficult to estimate the damage of shallow buried tunnels, and the loss of personnel and economy will be difficult to estimate. Therefore, the structure response value of shallow tunnel under ground motion is needed. The key points of the seismic design of the underground structure are found out by the analysis and experimental research. It provides a scientific basis for the optimization design of the underground engineering structure, such as the shallow buried tunnel structure. Therefore, it is of great significance to analyze some factors affecting the seismic response of shallow buried tunnels. The acceleration changes of surrounding rock and structure provide a reliable reference for the verification of the results of numerical simulation. Finite element software Ansys is used to establish a finite element model for dynamic response of tunnel structures under ground motion. The core theory of surrounding rock structure interaction is taken as the core theory, and a large number of calculations are carried out by the time history analysis method, and some laws are obtained. It can provide reference for the optimal design of shallow tunnels and the seismic response of underground structures. The main contents of this paper are as follows:
Firstly, the development trend of the underground structure is analyzed, the history of the seismic study of the underground structure, the main methods and the current research status are summarized, and the necessity and value of several factors affecting the structure response of shallow buried tunnel under the action of ground motion are put forward.
Secondly, through the introduction of the vibrating table and the making of the shaking table test, the acceleration changes of the surrounding rock and structure of the tunnel under the earthquake load are studied from the similar model, so as to provide a reliable reference for the verification of the results of the next step numerical simulation.
By using the time history analysis method of the established calculation model, the structural response of different parameters of shallow buried tunnel under ground motion is analyzed, and the rules and key factors are found out. Through the establishment of different depth of buried depth, seismic intensity, geological conditions, lining thickness, lining strength and other numerical models, the influence of shallow tunnel on Shallow Tunnel Several parameters of seismic response are analyzed and the corresponding influence modes are put forward. By analyzing the analytical results of seismic response of shallow buried tunnels under three-dimensional plane conditions, the understanding of seismic response characteristics of shallow buried tunnels is proposed. On the basis of the theoretical method and research results mentioned above, different concrete lining materials (different concrete) are advanced. The seismic response of shallow tunnel structure is discussed under different labelling, different lining thickness and different lining strength and different geological conditions.
(4) analyzing the calculation results of influencing factors and summarizing the principles and methods of anti shock measures for shallow tunnels.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U452.28

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