【摘要】 中国西部兴建的很多200～300 m高的堆石坝处于高烈度地震区。应力水平高时堆石体的颗粒破碎对其在循环荷载作用下的应力、应变特性有重要的影响。基于广义塑性理论,通过引入状态参数,建立了循环荷载作用下考虑颗粒破碎的堆石体的本构模型,并给出了模型参数的确定方法。与堆石体在400、800、1 500、2 200 kPa围压作用时的试验结果对比,表明所提出的本构模型可以较好地模拟循环荷载作用下颗粒破碎时堆石体的动应力和动应变响应。更多还原

【Abstract】 There are many 200-300 m high rockfill dams constructed in high earthquake areas located in western areas of China.The grain crushing of rockfill materials with high stress level has significant influence on the stress-strain properties under cyclic loading.Based on the theory of generalized plasticity,and by introducing state parameters,a new dynamic constitutive model for rockfill materials is formulated;and the determination of model parameters is provided as well.Finally the constitutive model is used to model the test results of rockfill materials at 400,800,1 500,2 200 kPa consolidated pressures respectively,which verifies that the proposed constitutive model can simulate well the dynamic stress and dynamic strain responses of rockfill materials under cyclic loading considering grain crushing.更多还原