發(fā)布時間：2018-06-28 03:36

  本文選題：破碎富水圍巖 + 流固耦合　； 參考：《蘭州交通大學(xué)》2017年碩士論文

【摘要】：隨著公路網(wǎng)和鐵路網(wǎng)的不斷發(fā)展,在修建過程中所遇到需要修建隧道通過的路段也不斷增加,而其中破碎富水圍巖段隧道也變得越來越常見。所以研究在破碎富水圍巖段隧道的施工具有重大的實際意義。本文首先對富水隧道滲流的研究意義與研究現(xiàn)狀做了總結(jié);之后對撲鴨腳隧道附近的工程地質(zhì)與水文地質(zhì)情況做出了概述;然后又對在撲鴨腳隧道YK217+660斷面的監(jiān)測方法進(jìn)行了介紹,并對監(jiān)測的結(jié)果進(jìn)行了分析;之后結(jié)合現(xiàn)場實際建立了基于FLAC3D的數(shù)值計算模型,模擬了隧道的開挖過程,并對滲流耦合和非滲流耦合工況下的隧道施工時的位移與應(yīng)力進(jìn)行了比較;最后對半斷面注漿和全斷面注漿對滲流耦合隧道位移和應(yīng)力的影響進(jìn)行了比較,對這兩種工況進(jìn)行了優(yōu)選。本文的主要結(jié)論有:(1)通過應(yīng)用FLAC3D軟件,對滲流耦合計算步增加對隧道位移影響的分析,結(jié)合工程實際的施工狀況得出了在當(dāng)前模型條件下,7500個耦合步數(shù)是合理的結(jié)論。(2)滲流對監(jiān)測斷面附近的位移影響不大,但對開挖掌子面附近的豎向最大位移影響比較大,影響比率在20%左右,而且滲流使得最大位移的范圍有所增大,削弱了隧道周圍圍巖的穩(wěn)定性。力學(xué)分析的結(jié)果說明,滲流對隧道監(jiān)測斷面和開挖掌子面附近的豎向最大應(yīng)力的影響比較大,在30%左右,而對其水平方向的應(yīng)力的影響則極小,在開挖掌子面附近僅為1.5%左右。(3)半斷面注漿對隧道掌子面徑向位移幾乎沒有控制力,對豎向位移的控制力也不強,在10%左右;全斷面注漿則對隧道的豎向位移和徑向位移有著明顯的限制作用,對徑向位移有30%左右的影響率,對豎向位移則有25%左右。(4)在對隧道所受應(yīng)力影響方面,半注漿對隧道豎向應(yīng)力的影響率為20%要大于全注漿的10%,但全注漿對隧道受到的水平力的影響率為30%要大于半注漿的20%。因為從應(yīng)力大小而言,水平力為大應(yīng)力,所以綜合而言,從減小應(yīng)力的角度來講,全注漿對隧道的保護(hù)效果也要好于半注漿。(5)通過綜合分析,在滲流特別豐富,隧道位移較大,襯砌極易壓壞的情況下建議使用全斷面注漿法,而在隧道位移不大,襯砌也不易壓壞但是有少量的滲流影響隧道施工與開挖進(jìn)度的情況下,從經(jīng)濟的角度考慮,半斷面注漿就能滿足要求。
[Abstract]:Along with the continuous development of highway network and railway network, the sections that need to be built through the tunnel are also increasing in the process of construction, and the tunnels in the fractured water rich surrounding rock are becoming more and more common. Therefore, it is of great practical significance to study the construction of tunnel in the broken water rich surrounding rock section. The significance and current research status are summarized, and then the engineering geology and hydrogeological conditions are summarized, and then the monitoring method of the YK217+660 section is introduced, and the results of the monitoring are analyzed. Then a numerical calculation model based on FLAC3D is set up in combination with the actual field. The excavation process of tunnel is simulated, and the displacement and stress of tunnel under coupled and non seepage flow coupling are compared. Finally, the effect of the half section grouting and full section grouting on the displacement and stress of the coupled tunnel is compared, and the two conditions are optimized. The main conclusions of this paper are: (1) pass. FLAC3D software is used to analyze the influence of the seepage coupling calculation step on the tunnel displacement. According to the actual construction conditions of the engineering, the 7500 coupling steps are reasonable conclusions. (2) the influence of the seepage on the displacement near the monitoring section is not significant, but the vertical maximum displacement near the excavation face is compared. The ratio is about 20%, and the percolation makes the maximum displacement increase, which weakens the stability of the surrounding rock around the tunnel. The results of mechanical analysis show that the influence of seepage on the tunnel monitoring section and the vertical maximum stress near the excavation face is relatively large, at about 30%, and the stress on the horizontal direction is extremely affected. Only about 1.5% near the excavation face. (3) the semi section grouting has little control on the radial displacement of the tunnel face, and the control force of the vertical displacement is not strong, at about 10%. The full section grouting has an obvious limiting effect on the vertical displacement and radial displacement of the tunnel, and the radial displacement has an influence rate of about 30%, and the vertical direction is vertical to the vertical displacement. The displacement is about 25%. (4) in the stress effect on the tunnel, the influence rate of the semi grouting on the vertical stress of the tunnel is 20% greater than that of the full grouting, but the effect rate of the full grouting on the horizontal force of the tunnel is 30% greater than the half grouting 20%. because the horizontal force is large stress in terms of the stress size, so in comprehensive terms, it should be reduced. In terms of force, full grouting has better protective effect on tunnel than half grouting. (5) through comprehensive analysis, full section grouting method is suggested in the case of percolation is especially rich, tunnel displacement is large and the lining is easily crushed, while the tunnel displacement is not large and the lining is not easily crushed, but a small amount of seepage affects tunnel construction and excavation. From the economic point of view, half section grouting can meet the requirements.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U452.11

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