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  Design of a Tunnel Face Reinforcement for Underground Structures in Geological Condition of SaintPetersburg

  Tunnel face reinforcement is an effective way to ensure its stability during the construction of underground structures and in some cases to minimize deformations of soil mass. Such temporary support is used to reduce the negative impact on buildings and other engineering structures due to construction of underground subway station in St. Petersburg. The paper focuses on assessing the possibility of reducing the deformations in the soil mass in the vicinity of underground structures through the use tunnel face reinforcement in very hard argillite like clays. To estimate the effect of these reinforcement on the soil stabilization in front of the tunnel face, a series of calculations were performed based on 3d numerical simulation with an account for natural soil anisotropy. The following parameters were considered as an element which let to control the soil deformation in front of tunnel face: length of the fiberglass anchors, stiffness of the individual anchor, number and layout of the anchors over the tunnel cross-section. Additional variable considered in the work is mechanical properties of hard clays. It was found, that the most significant factors in terms of minimizing the deformations in the soil mass are the adopted layout of the anchors over the cross-section of the underground structure and the axial rigidity of the advanced anchors. It was shown that face reinforcement can be effectively used to stabilize deformations in very hard argillite clays. The effective range of deformation and strength parameters of soil mass where tunnel face reinforcement work well is find out. Based on the studies performed, a method to design parameters of the tunnel face reinforcement was proposed, which let to ensure the stability of tunnel face but also to minimize the development of deformations due to tunnel construction. A comprehensive field studies conducted during research proves the results achieved during the numerical modelling.

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