Abstract
This study presents a novel construction pre-supporting system for large underground space excavation with shallow depth, Steel Tube Slab system (STS), in which adjacent steel pipes are connected by a couple of flanges, bolts and concrete for flexural capacity and lateral stiffness of the whole structure. The STS method is employed for the first time for the construction of the ultra-shallow buried and large span subway station in China, during which ground settlement and structural deformation are monitored. A numerical model for the subway station is established with reliability verified by monitored data comparison from numerical results and investigation on the effect of large span underground excavation on surrounding soil surrounding soil and existing buildings in soft soils. Unlike traditional methods, the STS method can effectively control and reduce the ground settlement during construction, thereby rendering it ideally suited for application in soft soils.
Highlights
Over the past few decades, concerns for the stability and safety of adjacent existing buildings and structures in urban areas have warranted studies on underground excavation techniques
It can be seen from the figure that after the completion of the middle column construction, the maximum ground settlement is located near the centre line of the horizontal STS structure, approximately 4.48 mm
Unlike the traditional pipe-curtain method, a lateral joint is installed in the STS structure which can effectively eliminate the need for complicated temporary supports and control the ground settlement
Summary
Over the past few decades, concerns for the stability and safety of adjacent existing buildings and structures in urban areas have warranted studies on underground excavation techniques. The underground structure built by this method is archshaped, which has low utilization for underground spaces Another new kind of pre-supporting system, referred to as the Concrete Arch Pre-supporting System, was proposed by Dadizadeh and Sadaghiani for construction of subway stations [14]. This method has been used in the construction of the Tehran Metro since 2002 and is a perfect method for construction of large span underground spaces in ultra-shallow-buried ground. Numerical analysis of subway station construction using STS structure and an engineering project are presented, along with discussions on future work
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