本文選題：淺埋偏壓隧道 + 穩(wěn)定性分析�。� 參考：《中南大學(xué)》2014年博士論文

【摘要】：隨著我國(guó)經(jīng)濟(jì)發(fā)展對(duì)綜合交通網(wǎng)絡(luò)和現(xiàn)代化城市建設(shè)的依賴(lài)性日益增強(qiáng),淺埋隧道工程作為一種重要的交通構(gòu)筑物型式,在丘陵山區(qū)斜坡地段公路、鐵路建設(shè)和城市地下空間開(kāi)發(fā)利用過(guò)程中往往不可避免,而淺埋隧道開(kāi)挖引起的圍巖應(yīng)力、位移變化較之深埋隧道更為復(fù)雜,研究淺埋隧道穩(wěn)定性和形變問(wèn)題對(duì)于隧道設(shè)計(jì)、施工和理論研究具有重要意義。學(xué)術(shù)界和工程界普遍認(rèn)為：企圖采用一種理論,徹底解決各種不同地質(zhì)條件下和不同使用目的的隧道工程的難題是不現(xiàn)實(shí)的,必須綜合利用多種理論研究手段才可獲得最佳效果。因此,有必要豐富、完善和拓展經(jīng)典理論在淺埋隧道工程之中的應(yīng)用,以期為淺埋隧道工程設(shè)計(jì)和施工提供科學(xué)理論指導(dǎo)。本文的主要研究?jī)?nèi)容如下： (1)基于極限分析上限定理和“切線(xiàn)法”非線(xiàn)性破壞準(zhǔn)則,構(gòu)建了考慮地表傾斜和隧底隆起的淺埋隧道圍巖破壞機(jī)制,進(jìn)而推導(dǎo)淺埋隧道極限圍巖壓力計(jì)算表達(dá)式,并運(yùn)用非線(xiàn)性規(guī)劃優(yōu)化方法對(duì)目標(biāo)函數(shù)進(jìn)行優(yōu)化求解。對(duì)典型影響因素的敏感性進(jìn)行算例分析,探討了斜坡坡腳開(kāi)挖對(duì)圍巖穩(wěn)定性的影響。結(jié)合c、φ值分別取不同折減系數(shù)的綜合強(qiáng)度折減技術(shù),為淺埋隧道圍巖穩(wěn)定性評(píng)價(jià)提供一種新的思路和方法。 (2)依托湖南省永吉高速公路龍?zhí)镀核淼拦こ虒?shí)例,以塑性區(qū)貫通為失穩(wěn)判據(jù),結(jié)合數(shù)值模擬方法和正交試驗(yàn)原理,辨明影響淺埋隧道圍巖穩(wěn)定性的主控因素。將淺埋隧道圍巖穩(wěn)定性極限上限分析方法、綜合強(qiáng)度折減技術(shù)和可靠度理論有機(jī)結(jié)合,運(yùn)用蒙特卡羅法計(jì)算淺埋隧道圍巖的失效概率和可靠度指標(biāo),同時(shí)分析了c、φ值不同概率分布形式以及參數(shù)間相關(guān)性對(duì)隧道工程可靠度的影響。 (3)基于極限分析上限定理,結(jié)合Hoek-Brown破壞準(zhǔn)則和非關(guān)聯(lián)流動(dòng)法則,構(gòu)建淺埋隧道掌子面三維多滑塊型破壞機(jī)制,推導(dǎo)淺埋隧道掌子面支護(hù)反力計(jì)算式。運(yùn)用非線(xiàn)性?xún)?yōu)化方法對(duì)目標(biāo)函數(shù)進(jìn)行優(yōu)化求解,進(jìn)而分析不同參數(shù)對(duì)淺埋隧道掌子面支護(hù)反力的影響規(guī)律,并對(duì)管棚注漿預(yù)支護(hù)條件下的淺埋隧道開(kāi)挖掌子面穩(wěn)定性進(jìn)行拓展研究。 (4)基于經(jīng)典彈塑性理論,考慮巖土介質(zhì)的應(yīng)變軟化效應(yīng),采用巖石材料的三線(xiàn)性應(yīng)力-應(yīng)變軟化(彈性-塑性軟化-塑性殘余)模型和虎克-布朗(Hoek-Brown)強(qiáng)度準(zhǔn)則,運(yùn)用逐步求解法獲得非對(duì)稱(chēng)荷載下圓形隧洞圍巖彈性區(qū)、塑性軟化區(qū)和塑性殘余區(qū)的應(yīng)力場(chǎng)、位移場(chǎng)和塑性區(qū)半徑的近似解析解。 (5)針對(duì)邊坡開(kāi)挖和隧道掘進(jìn)共存的特殊工況,以經(jīng)典彈塑性理論解析計(jì)算所得的圍巖徑向位移為最大隧洞收斂的初值,構(gòu)建山體斜坡和橢圓形隧道非均勻收斂的隨機(jī)介質(zhì)理論分析模型,推導(dǎo)出邊坡開(kāi)挖和隧道掘進(jìn)引起地表移動(dòng)與變形的計(jì)算公式,并結(jié)合現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)對(duì)計(jì)算結(jié)果進(jìn)行驗(yàn)證,拓寬了隨機(jī)介質(zhì)理論的工程應(yīng)用領(lǐng)域。
[Abstract]:With the increasing dependence of economic development on the comprehensive traffic network and the construction of modern cities, shallow tunnel engineering, as an important type of traffic structure, is located on slopes in hilly and mountainous areas. In the process of railway construction and urban underground space development and utilization, it is inevitable that the surrounding rock stress and displacement change caused by shallow tunnel excavation is more complicated than that of deep buried tunnel. The study on the stability and deformation of shallow buried tunnel is of great importance to tunnel design. Construction and theoretical research are of great significance. The academic and engineering circles generally believe that it is unrealistic to attempt to adopt a theory to solve the problem of tunnel engineering under various geological conditions and for different purposes. It is necessary to make comprehensive use of various theoretical research methods in order to obtain the best results. Therefore, it is necessary to enrich, perfect and expand the application of classical theory in shallow tunnel engineering, in order to provide scientific theoretical guidance for the design and construction of shallow tunnel engineering. The main contents of this paper are as follows: 1) based on the upper limit theorem of limit analysis and the nonlinear failure criterion of "tangent method", the failure mechanism of shallow tunnel surrounding rock considering surface tilt and tunnel bottom uplift is constructed, and the calculating expression of surrounding rock pressure of shallow buried tunnel is deduced. The objective function is solved by nonlinear programming optimization method. The sensitivity of typical influencing factors is analyzed and the influence of slope foot excavation on the stability of surrounding rock is discussed. Combined with the comprehensive strength reduction technique with different reduction coefficients, a new idea and method are provided for the stability evaluation of shallow tunnel surrounding rock. Based on the example of Longtan Ping Tunnel of Yongji Expressway in Hunan Province, the main controlling factors affecting the stability of surrounding rock of shallow buried tunnel are identified by taking the transfixion of plastic zone as the criterion of instability, combined with the numerical simulation method and the principle of orthogonal test. The upper limit analysis method of surrounding rock stability of shallow tunnel is combined with comprehensive strength reduction technique and reliability theory. The failure probability and reliability index of surrounding rock of shallow buried tunnel are calculated by Monte Carlo method. At the same time, the influences of different probability distribution forms of c and 蠁 values and the correlation between parameters on the reliability of tunnel engineering are analyzed. 3) based on the upper limit theorem of limit analysis, combined with Hoek-Brown failure criterion and non-associated flow rule, the three-dimensional multi-slide failure mechanism of shallow tunnel face is constructed, and the formula of supporting reaction force of shallow buried tunnel face is deduced. The nonlinear optimization method is used to solve the objective function, and the influence of different parameters on the supporting reaction force of shallow tunnel face is analyzed. The stability of the face of shallow tunnel excavation under the condition of pipe-shed grouting pre-supporting is studied. Based on the classical elastic-plastic theory and considering the strain softening effect of rock and soil media, the trilinear stress-strain softening (elastic-plastic softening plastic residual) model and Hoek-Brown strength criterion of rock materials are adopted. The approximate analytical solutions of stress field displacement field and radius of plastic zone in elastic zone plastic softening zone and plastic residual zone of circular tunnel under asymmetric load are obtained by using the stepwise solution method. In view of the special conditions of the coexistence of slope excavation and tunnel excavation, the radial displacement of surrounding rock calculated by classical elastic-plastic theory is the initial value of maximum tunnel convergence. A stochastic medium theoretical analysis model of non-uniform convergence of mountain slopes and elliptical tunnels is constructed, and the calculation formulas of surface movement and deformation caused by slope excavation and tunnel excavation are derived, and the results are verified by field monitoring data. The field of engineering application of stochastic medium theory is widened.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U451

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本文編號(hào)：1914317