A plane strain modeling study of a three-center arch for deep tunnels

作者：Zhao Yu^*; Lu Yiyu; Chen Hao

来源：China Civil Engineering Journal, 2010, 43(3): 68-74.

• A-plane
• Chongqing
• Crack development
• Deep tunnels
• Deep-buried tunnel
• Deformation Characteristics
• Deformation localization
• Elasticity moduli
• Failure process
• Fractured rock mass
• Geo-stress
• High-geostress
• Initial damage
• Internal friction angle
• Key component
• Model test
• Model tests
• Modeling studies
• Physical model
• Plane strains
• Poisson'
• s ratio
• Residual strength
• Surrounding rock
• Test results
• Three stages
• Tunnel projects
• Uniaxial compressive strength

In order to study the geostress state and deformation characteristics of the surrounding rock of deep tunnels, a plane strain model test, with the Gonghe tunnel project in Chongqing as the background, was conducted. Physical model materials were produced to meet the requirements of model test in terms of uniaxial compressive strength, elasticity modulus, tensile strength, Poisson';s ratio and internal friction angle. Observation of the deformation and crack development of key components was carried out by using the full inner-spy photograph technology. The test results indicate that under high geostress, obvious deformation localization developed and the deformation evolution was in stages, time delay and asymmetrical. The initial damage was due to rapid lateral failure, and the failure processes could be divided into three stages: crack local extension, crack fast coalescence, and residual strength. The fractured rock mass still provided bearing capacity, which was important to the stability of the surrounding rock.

• 出版日期2010