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Model Test Study on Deformation and Failure of Large-span Flat Tunnel Caused by Additional Load
(1 Shenzhen Transportation Public Facilities Construction Center, Shenzhen 518000;2 Civil Engineering Center of Ministry of Education Information Technology, Tongji University, Shanghai 200092;3 Shanghai Engineering Research Center of Underground Infrastructure Detection and Maintenance Equipment, Shanghai 200092)
Abstract Based on the large-span flat Maluanshan tunnel in Shenzhen, the failure process of tunnel structure un?
der the action of additional load in the surrounding rocks of grade Ⅳ and Ⅴ is studied by model test and the change rules of surrounding rock pressure, lining deformation and internal force of tunnel lining are analysed. The research results show that: (1) the surrounding rock pressure at crown increases at first and decreases later, and reaches the maximum with small lining deformation when additional load reaches certain critical value; (2) with an increase of additional load, deformation of lining experiences elastic stage, plastic stage and failure stage, and the lining deformation is large in the surrounding rock of gradeV; (3) with an increase of additional load, internal force of tunnel lining increases and the distributions of bending moment and axial force present the forms of "butterfly" and " rhombus",with more nonuniformity of distribution.
Abstract:
Based on the large-span flat Maluanshan tunnel in Shenzhen, the failure process of tunnel structure un?
der the action of additional load in the surrounding rocks of grade Ⅳ and Ⅴ is studied by model test and the change rules of surrounding rock pressure, lining deformation and internal force of tunnel lining are analysed. The research results show that: (1) the surrounding rock pressure at crown increases at first and decreases later, and reaches the maximum with small lining deformation when additional load reaches certain critical value; (2) with an increase of additional load, deformation of lining experiences elastic stage, plastic stage and failure stage, and the lining deformation is large in the surrounding rock of gradeV; (3) with an increase of additional load, internal force of tunnel lining increases and the distributions of bending moment and axial force present the forms of "butterfly" and " rhombus",with more nonuniformity of distribution.
CAI Xin1 LIU Huixi1 CHEN Fubin1 WU Lianbo1 NIU Bingyan2 LIU Xuezeng2,
3 SANG Yunlong2,
3
.Model Test Study on Deformation and Failure of Large-span Flat Tunnel Caused by Additional Load[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(4): 150-157