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基于Biot流体饱和多孔介质理论,求得层状饱和地基表面移动荷载的动力格林函数,进而建立2.5维间接边界元方法,研究了高速移动列车荷载作用下层状饱和地基-轨道耦合系统的动力响应。该文通过与已有结果的比较验证了方法的正确性,并以均匀饱和半空间地基和饱和基岩上单一饱和土层地基为模型进行了数值计算,分析了列车移动速度和饱和土层等对动力响应的影响。研究表明,层状饱和地基和均匀饱和地基对应的动力响应有着显著的差别;列车移动速度接近饱和地基的Rayleigh波速时,会引起饱和地基-轨道耦合系统的共振,产生较大的动力响应;饱和地基不透水情况下动力响应最大,饱和地基透水情况下动力响应次之,干土情况下动力响应最小。另外,饱和土孔隙率、饱和基岩与饱和土层刚度比、饱和土层厚度等也对动力响应具有重要影响。
Based on the Biot fluid saturated porous media theory, the dynamic Green’s function of the moving load on the surface of layered saturated ground was calculated, and a 2.5-D indirect boundary element method was established to study the dynamic response of the layered saturated soil-rail coupling system under high-speed moving train loads . In this paper, the correctness of the method is verified by comparison with the existing results. Numerical calculations are made on the model of a single saturated soil foundation on a saturated half-space foundation and a saturated bedrock. The effects of the moving speed of the train and the saturated soil on Effect of dynamic response. The results show that there is a significant difference between the corresponding dynamic response of layered saturated ground and saturated ground. When the train moving speed is close to the Rayleigh wave velocity of saturated foundation, the resonance of saturated ground-orbital coupling system will be induced and the dynamic response will be saturated. Under the condition of impervious foundation, the dynamic response is the largest, the dynamic response is the second when saturated foundation is permeable and the dynamic response is the least under dry soil. In addition, the saturated soil porosity, saturated bedrock and saturated soil stiffness ratio, saturated soil thickness also have an important impact on the dynamic response.