(1. Key Laboratory of Urban Security and Disaster Engineering，Ministry of Education，Beijing University of Technology，Beijing 100124，China；2. Shenzhen Branch，Beijing General Municipal Engineering Design and Research Institute Co.，Ltd.，Shenzhen，Guangdong 518042，China；3. School of Civil and Environmental Engineering，University of Science and Technology Beijing， Beijing 100083，China)
The installation of the buffer layers is of advantages to the seismic resistance of the tunnel. A set of flexible airbag loading system suitable for dynamic model test on shaking tables was developed to simulate the gravity stress of tunnel overburden. Dynamic response mechanism of loosen zone and buffer layers were analysed and compared based on tests data of acceleration，additional strain，additional bending moment and structure failure. It could be concluded that：(1) Both the loosen zone and buffer layers did not change the dynamic response rule and the damage mode of tunnel structures；(2) Due to the existence of loosen zone，the restraint effect of the surrounding rock on the tunnel structure is weakened，resulting in the increase of the deformation in tunnel structure. The additional bending moment of the structure increases，indicating that it is more vulnerable to damage in earthquakes considering loosen zones；(3) The installation of the buffer layers can effectively reduce the structure additional strain caused by seismic load，which improved the mechanical performance of the structure. This layer coordinated the overall deformation of the tunnel and improved the seismic performance of the structure；(4) In such problems，that tunnel structure surrounded by a softer medium layer，stiffness is the key factors which could be concluded in material thickness and strength.
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2018, Vol. 37 
