本文選題：隧道邊坡　切入點：穩(wěn)定性分析　出處：《中南大學》2014年碩士論文

【摘要】：摘要：隨著我國經(jīng)濟的迅速發(fā)展及基礎設施投入的加大,在工程建設中出現(xiàn)了越來越多的隧道工程。隧道洞口邊仰坡的穩(wěn)定性關系到整個隧道施工的順利進行。另外,若隧道洞口所處地段地質條件較差,極易出現(xiàn)滑坡問題。如何保證隧道洞口段工程施工的安全和質量,便成為研究熱點。 針對隧道洞口邊仰坡所處的地質條件及實際工程情況,本文采用極限分析上限原理對隧道洞口邊仰坡的穩(wěn)定性進行分析,主要包括以下幾個方面的內容： (1)基于極限分析上限原理,建立了隧道洞口邊仰坡的對數(shù)螺旋線破壞機構,對其穩(wěn)定性進行分析。首次計算了隧道洞口邊仰坡的上限計算公式,計算了其外部重力做功功率以及內部能量耗散功率方程,將隧道洞口邊仰坡臨界高度的求解轉化為非線性規(guī)劃的數(shù)學問題。將計算結果與已有的極限平衡法結果進行比較,可知兩者的計算結果相差不大,進而驗證了本文方法的有效性。 (2)考慮地震力荷載、孔隙水壓力作用的影響,并結合強度折減技術,計算了復雜情況下隧道洞口邊仰坡的安全系數(shù)。通過參數(shù)分析,得出地震力及孔隙水壓力對隧道洞口邊仰坡穩(wěn)定性的影響。 (3)針對非均質土體中應用上限定理的困難,利用滑動面離散技術,通過關鍵點的坐標生成速度間斷面,研究了非均質土的隧道洞口邊仰坡的穩(wěn)定性問題。與傳統(tǒng)解析方法的比較說明,當破壞機構的主要參數(shù)相同時,離散方法求得的功率與解析方法求得功率相近,驗證了離散方法的有效性。 (4)根據(jù)蒙華煤運通道九條嶺隧道邊仰坡工程及湘西大干溪I號隧道洞口邊仰坡滑坡工程,利用本文提出的穩(wěn)定分析方法,對實際隧道邊仰坡的安全系數(shù)及臨界高度進行了計算。結果表明,本文提出的上限分析方法對于隧道邊仰坡穩(wěn)定性分析是可靠和有效的。本文共有圖35幅,表5個,參考文獻97篇。
[Abstract]:Absrtact: with the rapid development of economy and the increase of infrastructure investment, more and more tunnel projects appear in the engineering construction.The stability of the elevation slope at the entrance of the tunnel is related to the smooth construction of the tunnel.In addition, if the geological condition of the tunnel entrance is poor, landslide is easy to occur.How to ensure the safety and quality of the tunnel entrance construction has become a research hotspot.In view of the geological conditions and the actual engineering conditions of the slope at the tunnel entrance, this paper analyzes the stability of the slope of the tunnel entrance by using the upper limit theory of limit analysis, which mainly includes the following aspects:1) based on the upper limit principle of limit analysis, the logarithmic helix failure mechanism of tunnel entrance slope is established and its stability is analyzed.For the first time, the upper limit formula of tunnel entrance slope is calculated, the external gravity work power and internal energy dissipation power equation are calculated, and the solution of critical height of tunnel entrance slope is transformed into a mathematical problem of nonlinear programming.Comparing the calculated results with the results of the existing limit equilibrium method, it can be seen that there is little difference between the two results, and the validity of the proposed method is verified.(2) considering the influence of seismic load and pore water pressure, and combining with strength reduction technique, the safety factor of tunnel entrance slope is calculated under complex conditions.Through parameter analysis, the influence of seismic force and pore water pressure on slope stability of tunnel entrance is obtained.In view of the difficulty of applying the upper bound theorem in heterogeneous soil, the stability of tunnel entrance slope in heterogeneous soil is studied by using slip surface discretization technique and velocity discontinuity surface generated by coordinates of key points.The comparison with the traditional analytical method shows that when the main parameters of the failure mechanism are the same, the power obtained by the discrete method is similar to the power obtained by the analytical method, which verifies the validity of the discrete method.4) according to the slope engineering of Jiujiaoling tunnel and the landslide project at the entrance of Daganxi No.1 tunnel in western Hunan, the safety factor and critical height of the actual tunnel slope are calculated by using the stability analysis method proposed in this paper.The results show that the upper bound analysis method proposed in this paper is reliable and effective for the stability analysis of tunnel slope.There are 35 figures, 5 tables and 97 references in this paper.
【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U453.1

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