本文選題：雙線平行盾構(gòu)隧道　切入點：Peck公式　出處：《巖土力學(xué)》2014年08期

【摘要】：基于Peck公式,對雙線水平平行盾構(gòu)隧道施工中土體損失引起的三維土體沉降計算方法進行研究。考慮先行隧道施工對后行隧道的影響和兩條隧道開挖面的不同位置,建立修正的三維Peck公式;通過分別計算先行盾構(gòu)隧道和后行盾構(gòu)隧道施工引起的土體沉降,疊加得到雙線水平平行盾構(gòu)施工引起的總的三維土體沉降。算例分析結(jié)果表明:預(yù)測值與實測值比較吻合;隨著兩條隧道開挖面前后距離的逼近,地面最大沉降量會逐漸增大;隨著土體深度z的增大,沉降略增大、沉降槽寬度則略減小;當(dāng)兩條隧道軸線水平距離L較小時,地面沉降量較大,符合正態(tài)分布規(guī)律;隨著L的增大,最大地面沉降量會逐漸減小,沉降曲線形狀慢慢由V型轉(zhuǎn)變成W型。
[Abstract]:Based on the Peck formula, this paper studies the calculation method of three-dimensional soil settlement caused by soil loss in the construction of double-line horizontal and parallel shield tunnel. The influence of the first tunnel construction on the rear tunnel and the different positions of the excavated surface of the two tunnels are considered. The modified three-dimensional Peck formula is established, and the settlement of soil caused by the construction of the advanced shield tunnel and the rear shield tunnel is calculated respectively. The total three-dimensional soil settlement caused by the double-line horizontal and parallel shield tunneling construction is obtained by superposition. The results of example analysis show that the predicted value is in good agreement with the measured value, and the maximum land subsidence will increase gradually with the distance between the excavated surface of the two tunnels approaching before and after the excavation. With the increase of soil depth z, the settlement slightly increases, and the width of settlement trough decreases slightly. When the horizontal distance between the two tunnels axis L is small, the amount of land subsidence is larger, which conforms to the normal distribution law; with the increase of L, The maximum land subsidence will gradually decrease and the shape of settlement curve will change from V type to W type.
【作者單位】： 浙江大學(xué)城市學(xué)院土木工程系;
【分類號】：U455.43
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本文編號：1666452