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Analysis of Horizontal Displacement of Single Pile Induced by Lateral
Penetration of Tunnel Based on the Pasternak Shear Layer Theory
(1. CRCC Yellow River Investment and Construction Co., Ltd., Jinan 250108; 2. China Railway 18th Bureau Group Co., Ltd.,Tianjin 300350; 3. School of Civil Engineering, Central South University, Changsha 410075; 4. School of Civil Engineering,Southwest Jiaotong University, Chengdu 610031)
Abstract Tunnel construction in soft soil stratum will induce noticeable surface subsidence and cause deformation
of the buildings and their foundations near the tunnel. However, the deformation pattern of pile foundation of adjacent building induced by subway tunnel construction is not fully understood. With the help of the Pasternak shear layer foundation model, the mechanism by which tunnel construction in soft soil stratum affects piles has been analyzed,the calculation model has been created that is used to calculate additional horizontal displacement and additional internal force of pile and the solving method is also provided. According to the results, the model has excellent accuracy in the case of lateral penetration of tunnel by single pile; According to the parameters analysis, the effect of tunnel buried depth on adjacent single pile is mainly seen in displacement distribution, but it does not significantly affect the peak value of displacement. The thickness of elastic layer is in negative correlation with the peak values of horizontal displacement and internal force, but it will not affect the distribution pattern of displacement and internal force. For the thickness C of elastic layer, the bending moment is constant at 2 m above and below the tunnel axis,and the shear force is constant at 4 m above the tunnel axis.
Abstract：
Tunnel construction in soft soil stratum will induce noticeable surface subsidence and cause deformation
of the buildings and their foundations near the tunnel. However, the deformation pattern of pile foundation of adjacent building induced by subway tunnel construction is not fully understood. With the help of the Pasternak shear layer foundation model, the mechanism by which tunnel construction in soft soil stratum affects piles has been analyzed,the calculation model has been created that is used to calculate additional horizontal displacement and additional internal force of pile and the solving method is also provided. According to the results, the model has excellent accuracy in the case of lateral penetration of tunnel by single pile; According to the parameters analysis, the effect of tunnel buried depth on adjacent single pile is mainly seen in displacement distribution, but it does not significantly affect the peak value of displacement. The thickness of elastic layer is in negative correlation with the peak values of horizontal displacement and internal force, but it will not affect the distribution pattern of displacement and internal force. For the thickness C of elastic layer, the bending moment is constant at 2 m above and below the tunnel axis,and the shear force is constant at 4 m above the tunnel axis.
LI Kejin1,
4 QI Yuejun2 WANG You3 QIU Hui1 ZHANG Xi1 WU Guangxing2
.Analysis of Horizontal Displacement of Single Pile Induced by Lateral
Penetration of Tunnel Based on the Pasternak Shear Layer Theory[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(6): 111-119
2023, Vol. 60 