本文選題：雙孔隧道　切入點：動載荷　出處：《重慶大學(xué)》2015年碩士論文

【摘要】：隨著城市化快速發(fā)展,城市交通形式已變得復(fù)雜多樣,城市地鐵和城市高速公路在一線、二線城市迅速興建,帶來了兩者重疊交錯施工的難題。本文以重慶軌道環(huán)線工程區(qū)間下穿內(nèi)環(huán)高速公路為研究背景,采用理論分析和Flac3D數(shù)值軟件模擬相結(jié)合的方法的研究方法,對雙孔水平地鐵隧道下穿施加重車動載荷的高速公路的施工穩(wěn)定性及影響因素進(jìn)行了分析計算。文章重點分析了隧道埋深,雙孔凈距和雙孔異步開挖間距三個因素對高速公路路面、圍巖及隧道的穩(wěn)定性進(jìn)行了研究,在此基礎(chǔ)上引入松動圈理論對開挖后的雙孔平行地鐵隧道的塑性區(qū)分布規(guī)律進(jìn)行了分析,對相似工程的施工有一定的借鑒和指導(dǎo)意義。主要研究成果如下:①在高速路面施加動載荷情況下,下穿隧道的開挖對上覆高速路面的沉降影響并非是隨著埋深的不斷增加而增加或減小,而是存在一個閥值,這個閥值約為三倍隧道直徑D,當(dāng)埋深小于3D時動載荷下路面沉降隨埋深的增大而增加,大于這個閥值,埋深越大對路面沉降的影響越小;此外埋深越大,動載荷對隧道結(jié)構(gòu)的穩(wěn)定性影響越小。②雙孔下穿隧道的凈距是影響開挖后圍巖穩(wěn)定性和路面沉降的一個重要因素。雙孔隧道凈距較小時,兩隧道的影響范圍相互疊加,加劇了路面、圍巖的沉降,最大沉降點位于兩洞中心處頂端,沉降槽呈“碗狀”;當(dāng)凈距大于1.5D時,最大沉降值隨凈距的增加呈線性減小,隧道內(nèi)最大主應(yīng)力呈減小趨勢,但路面沉降槽范圍擴(kuò)大;當(dāng)雙孔凈距大到一定程度時,兩洞幾乎不存在疊加效應(yīng),路面最大沉降點也將位于兩洞拱頂正上方的路面沉降點。③為縮短工期,提高施工效率,節(jié)約施工成本設(shè)計了雙孔隧道異步開挖工序。雙孔隧道的掌子面異步間距對上覆路面的沉降影響幾乎為零,但對于洞內(nèi)穩(wěn)定性影響較大;先行開挖的隧道掌子面由于后行隧道的開挖受到二次擾動,其應(yīng)力重新分布,沉降值略大于后行開挖的隧道;隨著異步間距的增大,雙洞的相互擾動逐漸減小,逐漸接近于單洞分別開挖的應(yīng)力分布④通過層次分析法對埋深、凈距、異步開挖間距三個因素對路面沉降和洞內(nèi)拱頂沉降進(jìn)行權(quán)重分析,結(jié)果證明埋深對路面沉降的影響權(quán)重最大,為0.6025;而凈距對洞內(nèi)沉降的影響權(quán)重最大,為0.8275;異步開挖掌子面間距對路面和洞內(nèi)沉降的影響權(quán)重很小,幾乎可以忽略。⑤引入松動圈理論,采用卡斯特奈(Kastner)公式,并將其耦合到FLAC3D數(shù)值模擬軟件中計算得出雙孔隧道松動圈半徑在動載荷影響下隨埋深呈現(xiàn)線性變化關(guān)系。
[Abstract]:With the rapid development of urbanization, the forms of urban transportation have become complex and diverse. This paper takes Chongqing Railway Link Project as the research background, adopts the method of combining theoretical analysis and Flac3D numerical simulation. This paper analyzes and calculates the construction stability and influencing factors of the expressway with double hole horizontal subway tunnel under which the vehicle dynamic load is aggravated. The stability of highway pavement, surrounding rock and tunnel is studied by three factors: double hole spacing and asynchronous excavation spacing. On the basis of this, the plastic zone distribution of the two-hole parallel subway tunnel after excavation is analyzed by introducing the loosening circle theory. The main research results are as follows: 1 under the condition of dynamic load on high speed pavement, The influence of the excavation of the underpass tunnel on the settlement of the overlying high speed pavement is not increased or decreased with the increasing of the buried depth, but there is a threshold value. The threshold value is about three times the diameter of the tunnel. When the buried depth is less than 3D, the pavement settlement increases with the increase of the buried depth, the larger the threshold, the smaller the influence of the buried depth on the pavement settlement, and the greater the buried depth, The smaller the influence of dynamic load on the stability of tunnel structure, the smaller the net distance of tunnel under double hole is, which is an important factor to influence the stability of surrounding rock and the settlement of pavement after excavation. When the net distance of tunnel is small, the influence range of the two tunnels is superimposed on each other. The maximum settlement point is located at the top of the center of the two holes, and the settlement trough is "bowl shaped". When the net distance is greater than 1.5 D, the maximum settlement value decreases linearly with the increase of the net distance, and the maximum principal stress in the tunnel tends to decrease. But the range of pavement settlement trough is enlarged, when the net distance between two holes is large to a certain extent, there is almost no superposition effect between the two holes, and the maximum settlement point of the road surface will also shorten the time limit and improve the construction efficiency by taking the pavement settlement point just above the arch roof of the two holes as the time limit. The asynchronous excavation procedure of double-hole tunnel is designed to save construction cost. The asynchronous distance between the face of the double-hole tunnel has almost zero effect on the settlement of the overlying pavement, but has a great effect on the stability of the tunnel. Due to the second disturbance in the excavation of the tunnel surface, the stress is redistributed and the settlement value is slightly larger than that of the tunnel excavated after the tunnel is excavated, and with the increase of the asynchronous distance, the mutual disturbance of the two holes decreases gradually. The stress distribution, which is gradually close to the single hole excavation, is analyzed by AHP to analyze the three factors of buried depth, net distance and asynchronous excavation spacing on the road surface settlement and the vault settlement in the tunnel. The results show that the influence weight of buried depth on pavement settlement is the largest (0.6025), while the influence weight of net distance on tunnel settlement is the largest (0.8275), and the influence weight of surface spacing of asynchronous excavation on pavement and tunnel settlement is very small. The loosening circle theory can be neglected and the Kastner formula is adopted and coupled to the FLAC3D numerical simulation software to calculate the linear relationship between the loosening ring radius of the two-hole tunnel and the buried depth under the influence of dynamic load.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U231;U451

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