土工合成材料加筋土桥台动力响应数值模拟分析

Numerical Simulation of Dynamic Response of Geosynthetic Reinforced Soil Abutment

归纳了土工合成材料加筋土桥台数值模拟中筋材、土体的本构模型及相关参数,基于FLAC3D有限差分软件,开展土工合成材料加筋土桥台动力响应数值模拟并通过振动台模型试验验证,在此基础上,讨论加筋长度、附加荷载以及加筋与否对桥台前墙的峰值位移的影响。结果表明:延长筋材长度、减小附加荷载以及加筋可有效提高桥台的抗震性能,在不加筋时,不利于结构整体稳定,易发生倒塌。

Firstly,the constitutive models for reinforcement and soil and their corresponding parameters in the numerical simulation of geosynthetic reinforced soil bridge abutment(GRSBA)were summarized.Secondly,the numerical simulation of the dynamic response of GRSBA is carried out based on FLAC3D finite difference software,and was verified by shaking table model test.On this basis,the influence of reinforcement length,additional load and reinforcement on the peak displacement of the abutment front wall is discussed.The numerical simulation results show that extending the length of the reinforcement,reducing the additional load,and the reinforcement can effectively improve the seismic performance of the abutment;while under unreinforced conditions,the abutment will suffer overall instability and be prone to collapse.