本文關(guān)鍵詞：強(qiáng)滲流條件下山嶺分離式隧道圍巖變形分析　出處：《湘潭大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 滲流作用 山嶺分離式隧道 圍巖變形 孔隙水壓力

【摘要】：隨著我國(guó)交通工程建設(shè)的不斷發(fā)展完善,高速公路的建設(shè)逐漸從人口密度較大的平原地區(qū)向山嶺重丘區(qū)開始延伸,而山嶺隧道的建設(shè)越來(lái)越突顯其重要性,并且在整個(gè)隧道工程建設(shè)中所占的比重越來(lái)越高。在山嶺隧道修建工程中,山區(qū)條件的復(fù)雜性導(dǎo)致了巖(土)體結(jié)構(gòu)條件與地質(zhì)條件的多樣性,使隧道施工過(guò)程中經(jīng)常會(huì)出現(xiàn)拱頂塌方事故或大變形失穩(wěn)等問題,這大大增加了資金投入與施工難度。目前,針對(duì)山嶺隧道圍巖變形的研究主要著重于圍巖力學(xué)參數(shù)的降低對(duì)隧道施工產(chǎn)生的不利影響及相應(yīng)施工控制措施,而對(duì)隧道圍巖內(nèi)部地下水滲流的力學(xué)影響,特別是針對(duì)強(qiáng)滲流條件下山嶺隧道圍巖變形分析的研究還不夠深入。本文以貴州省畢都高速公路雞公山隧道為背景,通過(guò)現(xiàn)場(chǎng)調(diào)研、監(jiān)控量測(cè)和數(shù)值模擬等方法,對(duì)強(qiáng)滲流條件下山嶺分離式隧道圍巖變形進(jìn)行了分析,主要研究成果如下:(1)從隧道滲流特征入手,對(duì)雞公山隧道拱頂、拱底兩側(cè)和邊墻滲漏水現(xiàn)象進(jìn)行了分析,并對(duì)隧道圍巖裂隙發(fā)育情況、邊墻滲漏水頻率進(jìn)行了統(tǒng)計(jì),結(jié)果表明,雞公山隧道在地下水強(qiáng)滲流作用影響下出現(xiàn)的地質(zhì)災(zāi)害問題較為嚴(yán)重。(2)針對(duì)雞公山隧道圍巖變形進(jìn)行了現(xiàn)場(chǎng)監(jiān)控量測(cè),分析了該隧道開挖過(guò)程中不含水段、弱滲水段和強(qiáng)滲水段的隧道圍巖豎向位移及水平位移規(guī)律,分析表明,隧道圍巖穩(wěn)定性與變形受強(qiáng)滲流作用的影響十分明顯。(3)針對(duì)隧道滲流參數(shù)難以確定的現(xiàn)狀,提出了一種符合山嶺分離式隧道在強(qiáng)滲流條件下的圍巖參數(shù)驗(yàn)證方法;通過(guò)設(shè)置多組參數(shù)(滲透系數(shù)和孔隙率)進(jìn)行數(shù)值模擬,將模擬結(jié)果與現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)進(jìn)行對(duì)比驗(yàn)證,得到強(qiáng)滲流條件下隧道滲流參數(shù)平均值,并分析了不同滲透系數(shù)和孔隙率條件下山嶺分離式隧道圍巖的孔壓分布、水平側(cè)移和隧道沉降規(guī)律。(4)利用FLAC3D數(shù)值模擬軟件,對(duì)雞公山隧道開挖支護(hù)過(guò)程進(jìn)行了滲流耦合模擬運(yùn)算,并將數(shù)值分析結(jié)果與現(xiàn)場(chǎng)數(shù)據(jù)比對(duì),應(yīng)證了模型的可靠性,并在此基礎(chǔ)上分析了強(qiáng)滲流作用下隧道開挖過(guò)程中圍巖的豎向位移、水平位移變化規(guī)律以及不同參數(shù)條件下的隧道圍巖變形規(guī)律。
[Abstract]:With the continuous development and perfection of traffic engineering construction in our country, the highway construction gradually extends from the high population density plain area to the mountain heavy hill area, and the mountain tunnel construction more and more highlights its importance. In the mountain tunnel construction project, the complexity of mountain conditions leads to the diversity of rock (soil) structure conditions and geological conditions. In the process of tunnel construction, there are often problems such as collapse of arch roof or instability of large deformation, which greatly increases the difficulty of capital investment and construction. The study of surrounding rock deformation in Shanling tunnel mainly focuses on the adverse effect of the reduction of surrounding rock mechanical parameters on tunnel construction and the corresponding construction control measures, and on the mechanical effect of underground water seepage in tunnel surrounding rock. Especially, the research on surrounding rock deformation analysis of mountain tunnel under strong seepage condition is not deep enough. This paper takes Jigongshan Tunnel of Bidu Expressway in Guizhou Province as the background, through field investigation. Monitoring measurements and numerical simulation methods are used to analyze the surrounding rock deformation of mountain separated tunnel under the condition of strong seepage. The main research results are as follows: 1) starting with the seepage characteristics of the tunnel, the arch roof of Jigongshan tunnel is analyzed. The phenomena of leakage on both sides of arch bottom and side wall are analyzed, and the development of cracks in surrounding rock of tunnel and the frequency of leakage of side wall are analyzed, the results show that. Jigongshan Tunnel under the influence of the strong seepage of groundwater, the geological hazard problem is more serious. 2) the deformation of surrounding rock of Jigongshan Tunnel is monitored and measured on the spot. The vertical displacement and horizontal displacement of surrounding rock of the tunnel in the process of excavation without water, weak seepage and strong seepage are analyzed. It is obvious that the stability and deformation of tunnel surrounding rock are affected by strong seepage. A method for verifying the surrounding rock parameters of the separated mountain tunnel under the condition of strong seepage is put forward. The numerical simulation is carried out by setting a number of parameters (permeability coefficient and porosity), and the simulation results are compared with the field measured data to get the average value of the tunnel seepage parameters under the condition of strong seepage. The distribution of pore pressure, horizontal lateral displacement and tunnel settlement under different permeability coefficient and porosity of the surrounding rock of mountain separated tunnel are analyzed. (4) the numerical simulation software of FLAC3D is used to simulate the distribution of pore pressure, horizontal lateral displacement and tunnel settlement. The seepage coupling simulation of the excavation and support process of Jigongshan Tunnel is carried out, and the reliability of the model is verified by comparing the numerical analysis results with the field data. On this basis, the vertical displacement, horizontal displacement and deformation of surrounding rock in the excavation process of tunnel under the action of strong seepage are analyzed.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U451.2

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相關(guān)期刊論文 前1條

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本文編號(hào)：1398079