地下结构间小净距土体的研究与处理

Research and Treatment of Small Clear Distance Soil Between Underground Structures

目前,城市地下空间得到广泛利用,地铁结构施作空间越来越小,越来越频繁地出现小净距双线[1]或小净距地下结构的方案,结构间地层中夹层在隧道施工中受到多次扰动,使得围岩及支护结构的力学行为变得更为复杂[2],因此小净距结构中夹层的设计及施工是隧道设计和在施工中的重点和难点。

At present, the underground space of the city is widely used, the space for the construction of the subway structure is getting smaller and smaller, and the scheme of small clear distance double line [1] or small clear distance underground structure appears more frequently, and the interlayer between the structures is sandwiched in the tunnel. The multiple disturbances in the construction make the mechanical behavior of the surrounding rock and the supporting structure more complicated [2]. Therefore, the design and construction of the interlayer in the small clearance structure is the key point and difficulty in the tunnel design and construction.