本文選題：地裂縫　切入點(diǎn)：地鐵隧道　出處：《長安大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著城市規(guī)模的不斷擴(kuò)大，地面交通的壓力也在增大，開發(fā)地下空間已是大勢所趨，近年來，為緩解城市交通的擁堵，地鐵的建設(shè)便在各大城市興起。在西安，地鐵的建設(shè)也進(jìn)入了新的時期。目前，西安地鐵1、2號線已經(jīng)先后開始運(yùn)營，其他線路的建設(shè)正如火如荼，由于西安特殊的地質(zhì)條件以及地裂縫的存在，給地鐵建設(shè)帶來了一系列新的課題，其中地鐵隧道-地層-地裂縫動力相互作用的問題以及地鐵運(yùn)行誘發(fā)振動等問題，都成為人們關(guān)注的重要課題，而地鐵動荷載是否會影響到地裂縫帶地鐵隧道的安全運(yùn)營，，已是地鐵建設(shè)中迫切需要研究的重要課題。 本文以西安地鐵2號線為工程背景，依托國家自然科學(xué)基金項目 地鐵動荷載作用下的地層-地裂縫-隧道相互作用研究‖，重點(diǎn)研究了地裂縫場地隧道-地層的振動響應(yīng)和地鐵振動的傳播規(guī)律，以及隧道-地層動力作用下的動應(yīng)力與變形特點(diǎn)。本文的研究手段為數(shù)值模擬，研究內(nèi)容包括： （1）通過查閱文獻(xiàn)，總結(jié)了地鐵振動的產(chǎn)生機(jī)理、振動傳播的一般規(guī)律及振動強(qiáng)度的影響因素； （2）提出了基于ABAQUS的隧道-地層-地裂縫模型三維振動響應(yīng)數(shù)值模擬方法，給出了地鐵移動荷載的施加方法； （3）通過對整體式隧道模型和分段式隧道模型及無地裂縫隧道模型振動響應(yīng)的模擬，分析了地裂縫場地地鐵振動的傳播規(guī)律，對有無地裂縫模型、整體式和分段式模型的振動響應(yīng)進(jìn)行了對比，分析了地裂縫對振動響應(yīng)的影響以及隧道的分段對振動響應(yīng)的影響。并且針對分段式隧道模型，分析了車速對振動響應(yīng)的影響； （4）通過對整體式和分段式隧道模型動應(yīng)力與變形的分析，得到了土與襯砌中動應(yīng)力的傳遞及分布規(guī)律，以及土體的變形與分布規(guī)律。 本文的研究成果對特殊場地地鐵振動的研究有一定的參考價值，為地鐵安全運(yùn)營監(jiān)測提供了參考，為制定完善的地裂縫場地地鐵振動控制標(biāo)準(zhǔn)奠定了基礎(chǔ)，也為本項目后續(xù)進(jìn)一步的試驗(yàn)和實(shí)測工作起到了參考作用。
[Abstract]:With the continuous expansion of urban scale, the pressure of ground transportation is also increasing, and the development of underground space has become a general trend. In recent years, in order to ease the congestion of urban traffic, subway construction has risen in major cities. The construction of the subway has also entered a new period. At present, the Xi'an Metro Line 1 and 2 have already been put into operation one after another, and the construction of other lines is in full swing. Due to the special geological conditions and the existence of ground cracks in Xi'an, A series of new problems have been brought to the subway construction, among which the dynamic interaction between subway tunnel and ground fissures and the vibration induced by subway operation have become an important issue that people pay attention to. Whether the dynamic load of subway will affect the safe operation of subway tunnel with ground fissures is an important subject that needs to be studied urgently in subway construction. Taking Xi'an Metro Line 2 as the engineering background and relying on the project of National Natural Science Foundation of China, this paper studies the interaction between strata, ground fissure and tunnel under dynamic load of subway. In this paper, the vibration response of tunnel and stratum and the propagation law of subway vibration in ground fissure site are mainly studied, and the dynamic stress and deformation characteristics under the action of tunnel and stratum dynamics are also studied. The research means of this paper are numerical simulation, the research contents include:. 1) the mechanism of subway vibration, the general law of vibration propagation and the influencing factors of vibration intensity are summarized by consulting literature. (2) the numerical simulation method of three-dimensional vibration response of tunnel-stratigraphic-ground fracture model based on ABAQUS is proposed, and the method of applying moving load of subway is given. 3) by simulating the vibration response of integral tunnel model, segmented tunnel model and ground fissured tunnel model, the propagation law of subway vibration in ground fissure site is analyzed, and the ground crack model with or without ground crack is analyzed. The effects of ground fissures on vibration response and the influence of tunnel segments on vibration response are analyzed, and the influence of vehicle speed on vibration response is analyzed for segmented tunnel model. 4) through the analysis of dynamic stress and deformation of integral and segmented tunnel models, the law of dynamic stress transfer and distribution in soil and lining, and the deformation and distribution of soil are obtained. The research results of this paper have certain reference value for the study of subway vibration in special site, provide a reference for subway safety operation monitoring, and lay a foundation for the establishment of perfect control standard of subway vibration in ground fissure site. It also plays a reference role in the further test and measurement of this project.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U231;U451.3

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