Abstract
This paper presents an experimental investigation of the role of pipe-roofs in the improvement of the stability of rectangular excavations constructed using pipe-roof technology. This technology is suitable for the construction of underground passages in crowded areas subjected to high requirements concerning soil settlement and stability during excavation construction. The design of a rectangular pipe-roof excavation required an understanding of the interaction between the soil, the pipe-roof and the excavation. This interaction is complex and plays an important role in the features of the pipe roof excavation. This paper presents a series of 1g physical experimental tests conducted in dry sand soil with an advanced monitoring system, which allows tracking of the soil settlement, the pipe deformation and the soil pressure. Analysis of these tests shows the effective role of the pipe-roof in reducing both the soil settlement and the soil pressure on the excavation. It also shows the influence of pipes on the deformation mechanism of the soil and its evolution from low deformation to the instability phase.
Highlights
Roof-box jacking (RBJ) technology is used for the construction of shallow underground passages in dense urban areas (Figure 1)
This paper presents an experimental study of the mechanical behavior of a rectangular excavation supported by a pipe-roof
This paper presented an experimental investigation of the mechanical behavior of a rectangular pipe-roof excavation
Summary
Roof-box jacking (RBJ) technology is used for the construction of shallow underground passages in dense urban areas (Figure 1). The advantage of this technology lies in its effective role in the reduction of the soil settlement and the improvement of the excavation stability in soft soils [1]. The performances of the pipe-roof excavation depend on the interaction between the soil, the pipe-roof and the excavation This interaction is complex and largely affects the contribution of the pipe roof to the reduction of the soil settlement as well as to the improvement of the excavation stability. Experimental studies were conducted to explore excavation stabilities [5]
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