地铁隧道施工期冻结法穿越断层破碎带 施工效果现场试验研究

 广州地铁隧道施工期穿越清泉街断裂，采用冻结法穿越断层破碎带施工，对施工期隧道支护结构的受力与变形状态、隧道周边净空收敛、地中位移、围岩压力及孔隙水压力、钢格栅应力、冻融条件下的地表隆沉等进行跟踪监测，通过对监测结果进行分析研究，获得冻结施工条件下的初期支护结构及环境土体应力与变形变化规律，在此基础上提出穿越断裂破碎带的冻结施工建议技术方法，研究成果可供其他工程参考。

IN-SITU TEST ON CONSTRUCTION EFFECT WITH FREEZING METHOD FOR FAULT-CROSSING FRAGMENTATION ZONE IN METRO TUNNEL

When crossing the Qingquanjie fault fragmentation zone in Guangzhou metro tunnel，the application of freezing method to construction of the connected aisle for metro project is introduced．During the construction，the stress and deformation of supporting structure，tunnel deformation constringency，ground displacement，stress of surrounding rock，stress of steel grille，the deformation of the ground surface in the course of freeze and thaw are tested. On the base of testing result，the stress and deformation of structure and environment soil are put forward studied. The laws of the survey results are examined. Finally，based on these studies，some suggestions are for guiding the construction about the freezing method and construction. The results can be used for reference of similar projects.