乌鲁木齐地铁1号线穿越活动地质断层的技术措施

分析乌鲁木齐地铁1号线穿越3条活动地质断层的特征,表明断层的变形具有不可抗拒性和巨大的破坏性。当断层发生突发性黏滑错动后,上、下盘相对产生复杂的空间三维变形,结构同时具有拉、压、剪、扭、弯等共同受力特性,其作用对穿越的隧道产生巨大的影响,导致隧道严重变形、开裂甚至破坏。据此估算1号线沿线断层的最大位移量及百年变形量,阐述浅埋暗挖法的结构设防方案、结构受力计算模型、断层处理的接头方案,以及断层处的结构防水等技术措施,提出的静态强制位移法是对此工程难题的初步尝试。

Technical Measures of Crossing Active Geological Fault Adopted for Line 1 of Urumqi Metro

Analysis of the characteristics of Line 1 of Urumqi Metro passing through 3 active geological faults indicates that the fault deformation is irresistible and destructive.When the fault occurs with sudden stick slip dislocation,the change of the upper and lower fault plate triggers complex three-dimensional deformation of the structure,both tensile and compressive,shear and torsion,bending and other common characteristics of stress,which have great influence on the crossing tunnel,leading to serious deformation,cracking and even failure.The maximum displacement along Line 1 faults and one hundred years of deformation are estimated,the structure design scheme of the shallow tunneling method,and the calculation model for the structure force,the joint scheme of fault handling and the corresponding waterproof measures are elaborated.The static forced displacement method presented is a preliminary attempt to the engineering problem.