發(fā)布時間：2018-05-22 13:41

  本文選題：注漿參數(shù) + 剛度遷移法��； 參考：《太原理工大學》2017年碩士論文

【摘要】：盾構隧道施工中壁后注漿至關重要,通過研究其對地表沉降的影響規(guī)律及特征機理可為地鐵的安全高效建設提供一定的參考依據(jù)�，F(xiàn)有大部分研究均是單獨分析各注漿參數(shù)如注漿量、注漿壓力、注漿材料等影響地層變形或應力,并未分析多因素調整條件下地層變形規(guī)律。同時,由于太原市特有的工程地質和水文地質條件,在地鐵隧道施工時,更應加強壁后注漿對地層變形以及土體位移的影響研究。本文以太原市地鐵二號線一期工程中心街西站——南中環(huán)街站為背景,以理論分析和數(shù)值模擬為主要研究方法,研究盾構隧道施工過程中土層應力及穩(wěn)態(tài),結果表明:在隧道開挖面出現(xiàn)應力集中現(xiàn)象,隧道開挖引起周圍一定范圍土體和地表土層的剪切破壞;隨著盾構的推進,隧道周圍土體發(fā)生失穩(wěn)破壞的范圍變化較小,而地表塑性屈服范圍逐步向兩側擴展;利用FLAC3D模擬盾構隧道施工時采用剛度遷移法,揭示隧道開挖完成后橫向、軸向地表沉降及管片位移規(guī)律:橫向地表沉降呈對稱“凹槽”型,隧道軸線上部地層沉降最顯著,地層變形量隨距軸線距離的增大而減小,直至一定范圍之后趨于穩(wěn)定,其主要影響區(qū)域為距隧道軸線20m處(約3D);軸向地表沉降沿隧道推進方向變化相對較小,且盾構推進過程中,軸向地表沉降呈“S”型曲線;管片變形整體呈頂部管片下沉、底部管片上浮、左右側管片產(chǎn)生遠離隧道軸線的位移;從橫向、軸向地表沉降及管片位移對考慮與不考慮漿體凝固進行對比研究,兩者差異顯著,表明在利用數(shù)值模擬軟件模擬盾構施工全過程時,剛度遷移法的運用是必不可少的;分別研究注漿量、注漿壓力、注漿材料彈性模量、泊松比對橫向、軸向地表變形以及管片位移的影響規(guī)律:注漿參數(shù)的增大均能有效控制橫向、軸向地表沉降及頂部管片的下沉;而底部管片上浮及左右側管片位移均隨注漿參數(shù)的增大而增大;注漿參數(shù)對于管環(huán)位移影響顯著性均為:底部管片上浮頂部管片下沉右側管片側移;綜合分析各注漿參數(shù)對橫向、軸向地表沉降及管片各關鍵部位的位移影響,注漿量不宜超過150%;注漿壓力宜取0.35-0.45MPa;注漿材料彈性模量取值為1.0-1.5MPa,泊松比不宜超過0.3;在此基礎上,以橫向最大地表沉降、軸向最大地表沉降以及底部管片上浮為指標,利用正交試驗綜合分析注漿參數(shù)對隧道及地表變形的影響,采用多元回歸方法得到隧道及地表變形與各注漿參數(shù)間的相關規(guī)律:利用正交試驗分析壁后注漿注漿量(A)、注漿壓力(B)、注漿材料彈性模量(C)、泊松比(D)對地表沉降的影響顯著性為:橫向和軸向地表沉降以及底部管片的上浮均為ACDB;利用數(shù)值模擬將注漿層劃分為上下兩部分,研究不均勻注漿對于地表沉降及管片位移的影響,為后續(xù)工程施工提供參考依據(jù)。結果表明:不均勻注漿不影響地表沉降及管片整體變形規(guī)律;不均勻超注漿和注漿壓力“上小下大”對地表沉降有所控制;不均勻注漿呈“上小下大”時會加劇底部管片的上浮。
[Abstract]:The post grouting in the shield tunnel is very important. Through the study of its influence on the surface subsidence and its characteristic mechanism, it can provide a certain reference for the safe and efficient construction of the subway. Most of the existing studies are the separate analysis of the grouting parameters such as grouting, grouting pressure, grouting material and so on. At the same time, because of the special engineering geology and hydrogeological conditions in Taiyuan, the influence of the post grouting to the deformation of the stratum and the displacement of the soil should be strengthened in the construction of the subway tunnel. This paper is based on the west station of the central street of the central street of the Metro Line No. two of Taiyuan City, South Zhong ring Street Station On the basis of theoretical analysis and numerical simulation, the stress and steady state of the soil layer during the tunnel construction are studied. The results show that the stress concentration phenomenon occurs on the tunnel excavation surface. The tunnel excavation causes the shear failure of the surrounding soil and the earth's soil layer around the tunnel. With the advance of the shield, the soil around the tunnel is unstable and destroyed. The range of range change is small, and the surface plastic yield range is gradually extended to both sides. Using the stiffness transfer method to simulate the construction of shield tunnel with FLAC3D, the transverse, axial surface settlement and displacement law of the tube are revealed after the tunnel excavation is completed. The lateral surface subsidence is symmetrical "groove" type, the upper stratum settlement in the upper part of the tunnel axis is the most significant and the formation deformation is the most. The length of the distance decreases with the distance of the distance axis, and then tends to be stable until a certain range. The main influence area is at the distance from the tunnel axis 20M (about 3D); the axial surface subsidence is relatively small along the direction of the tunnel propulsion, and the axial surface subsidence is "S" curve during the process of shield propelling; the deformation of the pipe is on the top of the tube and bottom. The displacements of the left and right sides of the tube are floating away from the axis of the tunnel. The comparison of the lateral, the axial surface settlement and the displacement of the tube is compared with the non consideration of the slurry solidification. The difference is significant. It shows that the application of the stiffness transfer method is essential in the simulation of the whole process of shield construction by using the numerical simulation software. Pulp volume, grouting pressure, modulus of elasticity of grouting material, lateral deformation of Poisson ratio, axial surface deformation and displacement of tube, the increase of grouting parameters can effectively control transverse, axial surface settlement and top pipe sinking; and the displacement of bottom pipe and left and right side pipe increase with grouting parameter increasing; grouting parameter The significant effect of the pipe ring displacement is that the tube sheet on the bottom of the bottom is moved to the right side of the tube, and the effect of the grouting parameters on the lateral, the axial surface settlement and the displacement of the key parts of the pipe should not exceed 150%; the grouting pressure should be 0.35-0.45MPa; the modulus of elasticity of the grouting material is 1.0-1.5MPa, Poisson's modulus The ratio is not more than 0.3. On this basis, the influence of grouting parameters on tunnel and surface deformation is synthetically analyzed by orthogonal test, using the maximum surface subsidence, the axial maximum surface settlement and the floatation of the bottom tube, and the correlation law between the tunnel and the surface deformation and the parameters of the grouting is obtained by the multiple regression method. The experimental analysis of grouting volume (A), grouting pressure (B), modulus of elasticity of grouting material (C) and Poisson's ratio (D) have a significant effect on surface settlement: horizontal and axial surface subsidence and the floatation of the bottom pipe are ACDB; the grouting layer is divided into two parts by numerical simulation, and the surface subsidence and the tube sheet are studied by the uneven grouting. The effect of displacement provides reference for the construction of subsequent projects. The results show that uneven grouting does not affect the surface settlement and the law of overall deformation of the tube; the uneven supergrouting and grouting pressure are "small and big" control the surface settlement, and the uneven grouting will increase the floatation of the bottom pipe when the uneven grouting is "small and big".
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.43

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