深圳软硬不均地层盾构机选型分析

Selection Analysis of Shield Tunneling in Shenzhen with Uneven Soft and Hard Strata

摘要: 深圳地铁12号线同乐–流塘区间的地铁隧道工程采用盾构法施工，区间穿越砾质黏性土、全–微风化粗粒花岗岩等复杂地层，施工风险极高。为了实现掘进时的安全高效，针对工区地质条件进行盾构的选型与部分机械参数的计算，期望得到与实际地质条件相匹配的盾构设计，在一定程度上降低施工的风险。最终盾构机选用了泥土加压的土压平衡式盾构，其余各性能参数均与理论计算相符，实际工程施工表明该盾构能够满足此类复合地层掘进的需要，得到了盾构选型的原则与经验，为此类工况盾构选型提供参考。

Abstract: The tunnel of Tongle-Liutang section of Shenzhen Metro Line 12 is constructed by shield tunneling method, crossing complex strata such as gravelly clay soil and completely weathered to weak weathered coarse granites, so the construction risk is extremely high. In order to realize the safety and efficiency of tunneling, shield selection and calculation of some mechanical parameters are carried out according to the geological conditions of the work area, so as to obtain the shield design matching the actual geological conditions and reduce the construction risk to a certain extent. Finally, the shield machine selected the EPB shield with soil pressure, and the other performance parameters were consistent with the theoretical calculation. The actual engineering construction showed that the shield could meet the needs of such complex formation tunneling, and the principles and experience of shield selection were obtained, providing reference for shield selection under such working conditions.