深圳填海区软硬交互地层中盾构隧道设计控制要素研究

深圳填海区的地层差异较大,分布厚度不均,软硬土层交互特征明显。盾构隧道在穿过该类交互地层时,不能仅仅按传统横切面法去分析,应考虑纵向变形的问题。以该问题作为切入点提出隧道纵向设计的重要性,并根据现行深圳轨道交通安全控制指标,对隧道纵向设计原理和计算方法进行了讨论,分析了各个计算方法的优缺点和适用条件,并通过交易广场项目和深圳地铁1号线鲤前区间盾构隧道的问题,提出了软硬交互地层盾构隧道设计的控制要素。

Research on Control Factors for Design of Shield Tunnel in Alternating Soft and Hard Layers in Shenzhen Reclamation Area

The formation of Shenzhen reclamation area is of great difference, with uneven thickness distribution and obvious alternating feature of soft and hard layers. In regard to shield tunnel passing through such alternating layers, it cannot be analyzed only according to the traditional cross-section method, however longitudinal deformation should be taken into consideration further. Depending on this issue, the importance of longitudinal design for the tunnel was put forward herein, and then the principle and calculation methods thereof were discussed according to the current safety control indicators for Shenzhen rail transit, with the advantages and disadvantages of each method and its applicable conditions analyzed. Furthermore, the control factors for the design of shield tunnel in alternating soft and hard layers were proposed on the basis of the problems from the trade plaza project and the interval tunnel from Liyumen to Qianhaiwan of Shenzhen Metro Line 1.