Study of shaking table model test on the aseismic behavior of structural #br#
reinforcement method for the tunnel portal part in soft rock
Cui Guangyao1 Ma Jianfei1 Wang Mingnian2 Wang Daoyuan2
1. North China University of Technology, Beijing 100144, China；
2. Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China
Abstract：To enhance the aseismic behaviors of the tunnel portal part in soft rock, a large shaking table model test relying on an actual tunnel portal part had been carried out to study the aseismic performance of structural reinforcement method. The test result shows that with the increase of the strength / rigidity of the lining structure, the minimum safety factor of hard. rock tunnel increases rapidly and the maximum value increases by 90.16% because the structure in hard rock suffers minor seismic effect. With the improvement of soft rock range in the tunnel cross-section, the seismic effect that tunnel suffers gradually increases, which makes the seismic inertia force and the forced displacement of the supporting structure increase continuously. Although the strength / rigidity of the lining structure in soft rock has been improved in the test, the percentage increase of the minimum safety factor of the tunnel structure lining is much lower than that of hard rock, and the maximum value is only 44.73%. The rigidity of the supporting structure in soft rock is greater than that of the surrounding rock, the improvement of tunnel antiseismic performance is limited only by increasing the strength / rigidity of the lining structureIt is proposed to adopt the structural reinforcement method and articulated design to carry out the seismic design of the tunnel portal part in soft rock. The research results are of great significance to the development of anti-seismic technology of tunnel portal part in soft rock.
崔光耀 麻建飞 王明年 王道远. 隧道软岩洞口段结构加强抗震#br#
措施振动台模型试验研究[J]. 土木工程学报, 2020, 53(S2): 315-320.
Cui Guangyao Ma Jianfei Wang Mingnian Wang Daoyuan. Study of shaking table model test on the aseismic behavior of structural #br#
reinforcement method for the tunnel portal part in soft rock. 土木工程学报, 2020, 53(S2): 315-320.
