摘要
针对高速列车引起的环境振动问题,分别以移动线源非均布荷载和粘弹性半空间体模拟运动列车荷载和地基,分析了高速列车引起的地基振动。首先采用积分变换法推导了移动线源非均布荷载作用下粘弹性半空间体动力响应的二维积分解析解,包括位移、速度和加速度。然后采用IFFT算法和自适应数值积分算法计算二维积分,得到了低音速、跨音速和超音速移动荷载作用下动力响应的数值结果。最后分析了荷载移动速度对动力响应最大值和分布的影响,发现当荷载移动速度大于Rayleigh波速时,粘弹性半空间体的动力响应出现显著变化。
To investigate vibrations of subground induced by high-speed trains, the viscoelastic half-space subjected to moving loads was used to model the subground under running trains. Analytical solutions for dynamic responses, including displacement, velocity and acceleration, were developed by Fourier integral transform. Coupled IFFT algorithm and adaptive quadrature algorithm was employed to compute double integrals in the analytical solutions. All the subsonic, transonic and supersonic cases were computed. The effects of velocity on the maximum responses and their distribution were discussed. It was found that the maximum and distribution of dynamic responses varied significantly as velocity increased beyond Rayleigh wave speed.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2006年第12期2104-2110,共7页
Chinese Journal of Geotechnical Engineering
