【摘要】：隨著我國高速公路里程的增長，隧道建設(shè)的規(guī)模越來越大，特別是穿越松散堆積體區(qū)域的隧道。本文主要通過模型簡化計算，結(jié)合有限元分析軟件進行數(shù)值模擬，并利用隧道開挖過程中的監(jiān)控量測，對隧道穿越松散堆積體區(qū)域管棚預(yù)支護的力學(xué)特性及支護參數(shù)進行研究，主要內(nèi)容如下： ①對松散堆積體的物質(zhì)組成、結(jié)構(gòu)特點、變形特點、力學(xué)特性進行總結(jié)，并利用松散介質(zhì)極限平衡理論對垂直均布圍巖壓力進行了簡化計算，，推導(dǎo)了相應(yīng)的計算公式。 ②對隧道超前預(yù)支護類型進行了總結(jié)，在管棚間距能保證管棚間土體成拱條件下對管棚進行了力學(xué)分析，推導(dǎo)了上覆巖土體傳遞給管棚荷載的簡要計算公式。根據(jù)隧道開挖過程，假定管棚為雙參數(shù)彈性地基梁模型，建立了相應(yīng)的微分方程進行求解。分析了考慮土拱效應(yīng)的管棚支護受力特性。 ③結(jié)合梵凈山2號隧道管棚的不同預(yù)支護參數(shù)進行數(shù)值模擬分析，對管棚設(shè)計參數(shù)與隧道整體位移量及拱頂沉降量之間的關(guān)系進行分析，結(jié)合施工前超前地質(zhì)預(yù)報、施工過程中的監(jiān)控量測，對隧道施工與設(shè)計進行動態(tài)控制分析，根據(jù)相應(yīng)分析結(jié)果對隧道管棚支護參數(shù)及支護措施作出了調(diào)整建議。
[Abstract]:With the increase of highway mileage in our country, the scale of tunnel construction is becoming larger and larger, especially the tunnel passing through loose accumulation area. In this paper, the mechanical properties and supporting parameters of pipe shed pre-support through loose accumulative area are studied by simplified model calculation, numerical simulation with finite element analysis software and monitoring measurement during tunnel excavation. The main contents are as follows: 1. The material composition, structural characteristics, deformation characteristics and mechanical properties of loose accumulations are summarized, and the pressure of vertical distributed surrounding rock is simplified by using the limit equilibrium theory of loose medium. The corresponding formulas are derived. 2. The types of advance pre-support of tunnel are summarized. The mechanical analysis of pipe shed is carried out under the condition that the spacing between pipes and sheds can ensure the soil arched between pipes, and the formula for calculating the load transferred from overburden rock to pipe shed is deduced. According to the tunnel excavation process, the pipe shed is assumed to be a two-parameter elastic foundation beam model, and the corresponding differential equation is established to solve the problem. The mechanical characteristics of pipe-shed support considering soil arch effect are analyzed. Based on the numerical simulation analysis of different pre-supporting parameters of pipe shed in Fanjingshan No. 2 tunnel, the relationship between the design parameters of pipe shed and the total displacement of tunnel and the settlement of arch roof is analyzed, and the geological forecast ahead of construction is combined with the analysis of the relationship between the design parameters of pipe shed and the total displacement of tunnel and the settlement of arch roof. The dynamic control analysis of tunnel construction and design is carried out by monitoring and measuring during construction. According to the corresponding analysis results, some suggestions are made for the adjustment of the support parameters and supporting measures of the tunnel pipe-shed.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.49;U456.3

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