“一洞双机”TBM组装洞结构形式优化分析与探讨

北疆供水2期工程某标段采用“一洞双机”的TBM施工组织模式，即2台TBM的组装及掘进施工均通过同一个组装洞进行，这对组装洞的结构形式提出了新的要求。为便于TBM组装及快速掘进施工，采用工程类比与数值计算相结合的方法，首先，从2台TBM同时组装与快速掘进施工等需求出发，分析原组装洞设计形式的缺陷； 然后，提出优化方案，并对结构变化较大的部位（主支洞交叉口处）进行结构受力验算，确保结构稳定。按照优化方案修建的TBM组装洞完成了2台设备的同时组装任务，并在后期掘进施工中初步达到了连续、快速掘进的目标，缩短了工期。

Optimization of Structure Form of an Assembly Tunnel for Two TBMs

The TBM construction organization mode of one tunnel for two TBMs, i.e. the assembly and excavation of two TBMs carried out in a same tunnel, is adopted in a section of the second phase of water diversion project in North Xinjiang. In order to realize simultaneous assembly of 2 TBMs and rapid excavation, the combination method of engineering analogy and numerical calculation is adopted, the defects of original design form of assembly tunnel are analyzed, an optimization scheme is proposed, and the structural stress at the intersection of the main branch, where the structure has been changed lot, is calculated to ensure structural stability. The simultaneous assembly of 2 TBMs in optimized TBM assembly tunnel has been realized, rapid excavation has been achieved, and the construction schedule has been shortened.