南京地铁3号线新庄站—鸡鸣寺站区间复合地层内盾构掘进控制技术

Shield Tunneling Control Technology in Complex Strata on Nanjing Metro Line: a Section from Xinzhuang Station to Jimingsi Station

南京地铁3号线新庄站—鸡鸣寺站区间盾构沿线穿越复合地层时极易引发盾构过度磨损和掘进功效低下等不良后果。从盾构选型设计、盾构掘进关键参数控制和辅助控制措施等多方面开展研究,总结了满足该区间施工要求的掘进综合控制措施。研究结果表明,选用复合式盾构且根据掘进断面地层特性动态调整掘进模式和施工参数、优化浆液和改良剂配方的综合控制技术可以保障盾构安全穿越复合地层。

Excessive wear and low efficiency often occur when the shield passes through the complex strata in Xinzhuang Station-Jimingsi Station interval on Nanjing metro Line 3. In this paper, the selection of the shield design, key parameters control in shield tunneling and auxilia- ry control measures are studied, the comprehensive control measure is summarized to meet the construction requirements. The research shows the composite shield that adopts comprehensive control technology can ensure the security of shield tunneling through the complex strata, by adjusting the driving mode, construction parameters, optimized grout and improved formula according to the dynamic characteristics in driving section formation.