Model test of evolution of face instability in shallow shield tunnel
TANG Xiao-wu, LI Jiao-yang, ZOU Jin-jie, ZHAO Yu, GAN Peng-lu, LIU Wei, PAN Cheng-lang
1.Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2. Power China Huadong Engineering Corporation, Hangzhou, 310014, China;
3. Institute of Disaster Prevention Engineering, Zhejiang University, Hangzhou, 310058, China;
4. School of Urban Rail Transportation, Soochow University Suzhou, 215131, China
Symmetry and semi-tunnel model were introduced to conduct four tests for various back rate of the support panel in order to analyze support pressure on the excavation face, ground deformation and the evolution of the face instability. The back rate of the support panel affects the value of support pressure and ground deformation without affecting their development law. With the increase in the face displacement, the support pressure dropped steeply to the minimum value, then increased to a steady state. Correspondingly, the instability development undergoes localization shear band, closed shear band and throughout shear band. Compared with theoretical models, the kinetic field mode is located in the closed shear band stage, when the support pressure is similar to the minimum value in tests. The wedge mode is located in throughout shear band stage, when the support pressure is similar to the stable value in tests.
TANG Xiao-wu, LI Jiao-yang, ZOU Jin-jie, ZHAO Yu, GAN Peng-lu, LIU Wei, PAN Cheng-lang. Model test of evolution of face instability in shallow shield tunnel. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(5): 863-869.
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