论文部分内容阅读
基于Peck公式,对双线水平平行盾构隧道施工中土体损失引起的三维土体沉降计算方法进行研究。考虑先行隧道施工对后行隧道的影响和两条隧道开挖面的不同位置,建立修正的三维Peck公式;通过分别计算先行盾构隧道和后行盾构隧道施工引起的土体沉降,叠加得到双线水平平行盾构施工引起的总的三维土体沉降。算例分析结果表明:预测值与实测值比较吻合;随着两条隧道开挖面前后距离的逼近,地面最大沉降量会逐渐增大;随着土体深度z的增大,沉降略增大、沉降槽宽度则略减小;当两条隧道轴线水平距离L较小时,地面沉降量较大,符合正态分布规律;随着L的增大,最大地面沉降量会逐渐减小,沉降曲线形状慢慢由V型转变成W型。
Based on the Peck formula, the calculation method of three-dimensional soil settlement caused by soil loss in the construction of double horizontal parallel shield tunnels was studied. Considering the influence of tunnel construction on the back tunnel and the different positions of the two tunnel excavation surfaces, a modified three-dimensional Peck formula is established. By calculating the settlement of the soil caused by the construction of the former shield tunnel and the back tunnel, Total Three-dimensional Soil Subsidence Caused by Construction of Two-line Horizontal Parallel Shield. The results of the example analysis show that the predicted values are in good agreement with the measured values. With the approaching of the distance between the two tunnels, the maximum settlement of the ground will gradually increase. As the soil depth z increases, the settlement slightly increases And the width of the settling tank is slightly reduced. When the horizontal distance L between two tunnel axes is small, the ground settlement is larger, which is in accordance with the law of normal distribution. With the increase of L, the maximum ground settlement will decrease gradually. The settlement curve Shape slowly transformed from V-type W-type.