本文選題：雙線平行盾構(gòu)隧道 + 土體變形�。� 參考：《巖土力學(xué)》2014年09期

【摘要】：基于雙線水平平行盾構(gòu)施工中土體損失引起的土體變形二維解析解,建立土體變形三維解析解。取不同的縱向位置作為變量,建立土體損失率沿縱向的變化方程;考慮先行隧道施工對(duì)后行隧道的影響,分別計(jì)算兩條盾構(gòu)隧道施工引起的土體變形,疊加得到雙線平行盾構(gòu)施工引起的土體總變形。其方法能夠計(jì)算土體深層沉降和水平位移,較精確地反映土體三維變形。算例分析結(jié)果表明:預(yù)測(cè)值與實(shí)測(cè)值較為吻合;土體沉降隨著離開(kāi)挖面距離的增加而不斷增大,最終在x=-40 m左右時(shí)趨于穩(wěn)定;隨著先行隧道與后行隧道開(kāi)挖距離的接近,最大土體總沉降量逐漸增大;土體沉降會(huì)隨著深度z的增大而略微增加,但沉降槽寬度將略微減小;隨著兩條隧道軸線水平距離L的增大,最大土體沉降逐漸減小,沉降曲線形狀慢慢由V型轉(zhuǎn)變成W型,不再符合正態(tài)分布規(guī)律。
[Abstract]:Based on the two-dimensional analytical solution of soil deformation caused by soil loss during the construction of double-line horizontal and parallel shield tunneling, the three-dimensional analytical solution of soil deformation is established. Taking different longitudinal positions as variables, the variation equation of soil loss rate along longitudinal direction is established, and the deformation of soil caused by the construction of two shield tunnels is calculated by considering the influence of tunnel construction on the later tunnel. The total deformation of soil caused by double line parallel shield construction was obtained by superposition. The method can calculate the deep settlement and horizontal displacement of soil and accurately reflect the three dimensional deformation of soil. The results of example analysis show that the predicted value is in good agreement with the measured value, the soil settlement increases with the increase of the distance from the excavated surface, and finally tends to be stable at about x-40 m, and with the approaching of the excavation distance between the first tunnel and the rear tunnel, the settlement of the soil increases with the increase of the distance from the excavated surface to the excavated surface. The maximum total settlement of soil gradually increased, the settlement of soil increased slightly with the depth z, but the width of settlement trough decreased slightly, with the increase of horizontal distance L of the two tunnels axis, the maximum settlement of soil gradually decreased. The shape of settlement curve is gradually changed from V type to W type, which no longer accords with the normal distribution law.
【作者單位】： 浙江大學(xué)城市學(xué)院土木工程系;
【分類號(hào)】：U451

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