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Study on the Influence of Coefficients of Subgrade Reaction and Lateral Pressure on Deformation of the Shield Tunnel
(1 College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060; 2 Underground Polis Academy, Shenzhen University, Shenzhen 518060; 3 China Academy of Railway Sciences (Shenzhen) Research and Design Institute Co., Ltd., Shenzhen 518060)
Abstract In the calculation of internal force and deformation of shield tunnel lining structure, the coefficient of
subgrade reaction and the coefficient of lateral pressure are important representational parameters of soil mass.Based on a load-structure calculating model of shield tunnel, the finite element software is used to establish a fine model of the shield tunnel lining structure which considers the effect of bolt pre-tightening force. The influence of the coefficient of subgrade reaction and the coefficient of soil lateral pressure on the deformation of shield tunnel lining structure under the initial loading mode and upper loading mode is studied. The results show that the coefficient of subgrade reaction and the coefficient of lateral pressure of soil mass have a significant effect on the deformation of shield tunnel lining structure, and the ovality of shield tunnel decreases with the increase of the subgrade reaction coefficient and soil lateral pressure coefficient; concrete lining of the shield tunnel begins to yield when the ovality is 33.52 -37.65 mm, and the ovality increment will increase significantly after getting into yielding state; under the same load change, the increment of ovality decreases with the increase of coefficient of subgrade reaction and coefficient of lateral pressure, and the increment of ovality in the upper loading stage is obviously larger than that in the initial loading stage.
Abstract：
In the calculation of internal force and deformation of shield tunnel lining structure, the coefficient of
subgrade reaction and the coefficient of lateral pressure are important representational parameters of soil mass.Based on a load-structure calculating model of shield tunnel, the finite element software is used to establish a fine model of the shield tunnel lining structure which considers the effect of bolt pre-tightening force. The influence of the coefficient of subgrade reaction and the coefficient of soil lateral pressure on the deformation of shield tunnel lining structure under the initial loading mode and upper loading mode is studied. The results show that the coefficient of subgrade reaction and the coefficient of lateral pressure of soil mass have a significant effect on the deformation of shield tunnel lining structure, and the ovality of shield tunnel decreases with the increase of the subgrade reaction coefficient and soil lateral pressure coefficient; concrete lining of the shield tunnel begins to yield when the ovality is 33.52 -37.65 mm, and the ovality increment will increase significantly after getting into yielding state; under the same load change, the increment of ovality decreases with the increase of coefficient of subgrade reaction and coefficient of lateral pressure, and the increment of ovality in the upper loading stage is obviously larger than that in the initial loading stage.
CHEN Weijie1 SU Dong1,
2 CHEN Xiangsheng1,
2 PANG Xiaochao2 etc
.Study on the Influence of Coefficients of Subgrade Reaction and Lateral Pressure on Deformation of the Shield Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(5): 110-115
2020, Vol. 57 