圓形隧道環(huán)向存在隱伏充填溶腔時防突巖墻的上限穩(wěn)定性分析
發(fā)布時間：2018-11-19 18:42
【摘要】：巖溶隧道施工中遭遇高壓充填溶腔時,若防突巖墻的穩(wěn)定性不足易造成突水突泥等地質(zhì)災(zāi)害.因此基于極限分析原理提出了一種分析防突巖墻穩(wěn)定性的研究思路.針對隧道環(huán)向遭遇隱伏充填溶腔的工況,利用廣義切線法獲得Hoek-Brown非線性破壞準(zhǔn)則的轉(zhuǎn)化強(qiáng)度參數(shù),構(gòu)建了巖墻二維計算模型.并結(jié)合上限原理與強(qiáng)度折減技術(shù),將安全系數(shù)引入能耗分析過程,達(dá)到了表征防突巖墻穩(wěn)定性的目的.最后,通過優(yōu)化分析,探討了巖墻安全系數(shù)隨各參數(shù)的響應(yīng)情況.研究結(jié)果表明:除圍巖重度參數(shù)外,巖墻厚度、溶腔充填物壓力、隧道支護(hù)壓力、圓形隧道斷面直徑、單軸抗壓強(qiáng)度、Hoek-Brown常數(shù)等,都對巖墻安全系數(shù)的變化影響顯著.此外,將方法應(yīng)用至"宜萬鐵路"、"忠墊高速"和"恩來高速"的巖溶隧道中,良好的結(jié)果驗證了方法的可行性.
[Abstract]:When the karst tunnel is filled with high pressure cavities, if the stability of the anti-outburst wall is insufficient, it will easily cause geological disasters such as water inrush and mud outburst. Therefore, based on the limit analysis principle, a research idea of analyzing the stability of anti-outburst rock wall is put forward. According to the condition of the tunnel encountering the concealed filling cavity in the circumferential direction, the transformation strength parameters of the Hoek-Brown nonlinear failure criterion are obtained by using the generalized tangent method, and the two-dimensional calculation model of the rock wall is constructed. Combined with the upper limit principle and the strength reduction technique, the safety factor is introduced into the energy consumption analysis process, and the purpose of characterizing the stability of the anti-outburst wall is achieved. Finally, through optimization analysis, the response of safety factor of rock wall with each parameter is discussed. The results show that the thickness of rock wall, the pressure of cavity filling, the pressure of tunnel support, the diameter of circular tunnel section, the uniaxial compressive strength and the Hoek-Brown constant all have significant effects on the safety factor of rock wall. In addition, the method has been applied to karst tunnels of "Yiwan Railway", "Zhongcushion High Speed" and "Enlai Expressway". The results show that the method is feasible.
【作者單位】： 中南大學(xué)土木工程學(xué)院;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計劃(973計劃)項目(2013CB036004) 國家自然科學(xué)基金資助項目(51378510,51308072)~~
【分類號】：U451
本文編號：2343100
[Abstract]:When the karst tunnel is filled with high pressure cavities, if the stability of the anti-outburst wall is insufficient, it will easily cause geological disasters such as water inrush and mud outburst. Therefore, based on the limit analysis principle, a research idea of analyzing the stability of anti-outburst rock wall is put forward. According to the condition of the tunnel encountering the concealed filling cavity in the circumferential direction, the transformation strength parameters of the Hoek-Brown nonlinear failure criterion are obtained by using the generalized tangent method, and the two-dimensional calculation model of the rock wall is constructed. Combined with the upper limit principle and the strength reduction technique, the safety factor is introduced into the energy consumption analysis process, and the purpose of characterizing the stability of the anti-outburst wall is achieved. Finally, through optimization analysis, the response of safety factor of rock wall with each parameter is discussed. The results show that the thickness of rock wall, the pressure of cavity filling, the pressure of tunnel support, the diameter of circular tunnel section, the uniaxial compressive strength and the Hoek-Brown constant all have significant effects on the safety factor of rock wall. In addition, the method has been applied to karst tunnels of "Yiwan Railway", "Zhongcushion High Speed" and "Enlai Expressway". The results show that the method is feasible.
【作者單位】： 中南大學(xué)土木工程學(xué)院;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計劃(973計劃)項目(2013CB036004) 國家自然科學(xué)基金資助項目(51378510,51308072)~~
【分類號】：U451
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1 李凌宜;李艷濤;;并行隧道不同間距對中巖墻穩(wěn)定性的影響研究[A];2014中國城市地下空間開發(fā)高峰論壇論文集[C];2014年
，本文編號：2343100
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