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。 Many of the 200-300 m rockfill dam built in western China are in high-intensity earthquake area. When the stress level is high, the particle crushing of the rockfill body has an important influence on the stress and strain characteristics under the cyclic loading. Based on the generalized plastic theory, the constitutive model of rockfill under cyclic loading is established by introducing the state parameters, and the method to determine the model parameters is given. Compared with the test results of CFRD at confining pressure of 400, 800, 1 500 and 200 kPa, the proposed constitutive model can simulate the dynamic stress of the rockfill under cyclic loading and Dynamic response.