本文選題：公路隧道　切入點(diǎn)：松動(dòng)圈分布規(guī)律　出處：《西安工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：大量公路隧道建設(shè)及監(jiān)測的過程證明,在隧道開挖過程中由于應(yīng)力重分布而存在著松動(dòng)圈,松動(dòng)圈的發(fā)生發(fā)展及穩(wěn)定對于隧道的穩(wěn)定性至關(guān)重要,以圍巖松動(dòng)圈為支護(hù)對象的支護(hù)理論為松動(dòng)圈支護(hù)理論。 為了利用松動(dòng)圈理論進(jìn)行公路隧道設(shè)計(jì),研究公路隧道內(nèi)部圍巖松動(dòng)圈的分布規(guī)律,給出判定松動(dòng)圈分布范圍的有效方法,從而推動(dòng)松動(dòng)圈支護(hù)技術(shù)的進(jìn)步。本文首先通過理論研究,分析比較了彈性、塑性、彈塑性理論確定圍巖松動(dòng)圈的方法,并建立了基于彈塑性力學(xué)的松動(dòng)圈分布范圍理論計(jì)算方法；其次進(jìn)行數(shù)值模擬研究,給出了利用FLAC3D數(shù)值模擬軟件進(jìn)行松動(dòng)圈判定的方法步驟,通過隧道橫斷面的塑性區(qū)云圖,體積應(yīng)變云圖,剪切應(yīng)變云圖,確定松動(dòng)圈的分布；最后進(jìn)行公路隧道圍巖松動(dòng)圈的量測技術(shù)研究,總結(jié)了多點(diǎn)位移計(jì)進(jìn)行松動(dòng)圈測試的方法步驟,通過繪制位移時(shí)間曲線、數(shù)據(jù)分析進(jìn)行圍巖松動(dòng)圈分布的判定。以茶鎮(zhèn)隧道和西施坡隧道為例,運(yùn)用彈塑性理論計(jì)算、數(shù)值模擬、圍巖內(nèi)部位移量測相結(jié)合的方法得出：茶鎮(zhèn)隧道Ⅲ.Ⅳ級圍巖松動(dòng)圈均在2m以內(nèi)；西施坡隧道Ⅳ、V級圍巖松動(dòng)圈分界點(diǎn)在2m-3m之間。理論計(jì)算、數(shù)值模擬、監(jiān)測數(shù)據(jù)所得的松動(dòng)圈范圍在同隧道同級別圍巖中,取得良好的一致性。通過比較彈塑性理論計(jì)算、數(shù)值模擬及多點(diǎn)位移計(jì)量測技術(shù)的優(yōu)缺點(diǎn),認(rèn)為利用松動(dòng)圈支護(hù)理論進(jìn)行公路隧道支護(hù)設(shè)計(jì)時(shí),宜首先進(jìn)行理論計(jì)算和數(shù)值模擬,給出支護(hù)參數(shù),進(jìn)入施工階段后進(jìn)行松動(dòng)圈量測,根據(jù)量測結(jié)果進(jìn)行支護(hù)參數(shù)的優(yōu)化,從而確保隧道安全快速以及信息化施工。
[Abstract]:A large number of highway tunnel construction and monitoring process proved that there is a loose circle due to stress redistribution during the tunnel excavation. The occurrence, development and stability of the loosening circle is very important for the stability of the tunnel. The supporting theory of surrounding rock loose ring is the support theory of loose ring. In order to make use of loosening circle theory to design highway tunnel, to study the distribution law of loosening circle in surrounding rock of highway tunnel, an effective method to judge the distribution range of loosening circle is given. So as to promote the progress of loose ring support technology. Firstly, through the theoretical study, this paper analyzes and compares the elastic, plastic and elastic-plastic theory to determine the loose zone of surrounding rock. The theoretical calculation method of loosening circle distribution range based on elastic-plastic mechanics is established. Secondly, the numerical simulation research is carried out, and the method steps of determining loosening circle by using FLAC3D numerical simulation software are given, and the cloud diagram of plastic zone of tunnel cross section is given. Volume strain cloud diagram, shear strain cloud diagram to determine the distribution of loosening circle. Finally, the measurement technology of surrounding rock loosening circle of highway tunnel is studied, and the method and steps of multi-point displacement meter for loosening circle testing are summarized, and the displacement time curve is drawn. The data analysis is used to judge the distribution of surrounding rock loose circle. Taking Cha Zhen Tunnel and Xishhipo Tunnel as examples, the elastic-plastic theory is used to calculate and simulate the loosening zone of surrounding rock. By combining the displacement measurement of surrounding rock, it is concluded that the loosening zone of the third and fourth grade surrounding rock of the Cha Zhen tunnel is within 2m, and the boundary point of the loosening circle of the V class rock of Xishipo tunnel is between 2m-3m. The range of loose circles obtained from monitoring data is in good agreement with the surrounding rock of the same level of tunnel. The advantages and disadvantages of the elastoplastic theory calculation, numerical simulation and multi-point displacement measurement techniques are compared. It is considered that in the design of highway tunnel support with loosening ring support theory, theoretical calculation and numerical simulation should be carried out first, and the supporting parameters should be given, and the loose ring measurement should be carried out after entering the construction stage, and the support parameters should be optimized according to the measured results. In order to ensure tunnel safety and rapid and information construction.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U451.2

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