介绍了北京地铁10号线麦子店—三元桥站—亮马河站区间(左右线净距离仅为1.7～3m，平行穿越长度为235m）及旁穿12层全装配壁板居民楼(与其基础水平净距离3.7～5m左右，垂直距离为11.7m)的施工总体思路和具体做法。其中首次提出了综合松散系数K的理论计算公式并给出了K的实测方法。在合理使用铰接装置和超挖刀、控制盾构推力、及时复拧管片螺栓等常规措施的基础上提出了盾构曲线段施工的两个新措施：一是考虑到盾构机的惯性，曲线段提前3～5m开始转弯，并提前3～5m结束转弯；二是考虑到曲线段盾构在管片脱出盾尾后产生扭转而非平移，对盾构进行预偏转。

MaizidianSanyuanqiaoLiangmahe shieldbored tunnel on Line 10 of Beijing Metro consists of twin tubes, which go parallel for 235m with only 1.7～3m net spacing. The tunnel crosses underneath close to a 12storey assembled residential building, with the horizontal net distance to the building foundations being 3.7～5m and the vertical net distance to the building foundations being 11.7m. The construction of the shieldbored tunnel is presented in the paper. The theoretical calculation equations and the measurement methods for the comprehensive looseness coefficient “K” are provided. In additional to the conventional construction measures, such as proper use of the articulations and overcutters, proper control of the thrust forces of the shields and timely retightening of the segment bolts, two items of new countermeasures are proposed for the construction of the curved sections of the shieldbored tunnels. The two items of new countermeasures include: 1) Due to the inertia of the shields, the shields start to bore on curved sections 3～5m ahead of the schedule and stop the boring on the curved sections 3～5m ahead of the schedule; 2) Due to the rotation of the shields on the curved sections when the segment rings are released, rotationrectifying measures are taken in advance.