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利用新研制的大型堆石料风化试验仪,对一典型泥质粉砂岩堆石料进行了荷载作用下干湿和温度耦合变化的风化试验。研究了在湿冷–干热耦合循环作用下堆石料颗粒的劣化机理,分析了劣化过程所产生的堆石料变形的规律。试验结果表明:湿冷–干热循环可使堆石料试样发生显著的劣化变形,堆石料在自然环境中的劣化变形应是高堆石坝后期变形的重要组成部分。根据试验结果,建立了可以描述堆石料劣化变形的4参数模型,可采用初应变法进行有限元计算。
Using the newly developed large-scale rockfill weathering tester, the weathering test of a typical argillaceous siltstone rockfill material under the action of load is carried out. The degradation mechanism of rockfill particles under wet-dry-heat coupling cycle was studied, and the deformation rules of rockfill materials produced during the degradation process were analyzed. The experimental results show that the wet-dry-thermal cycle can significantly deform the rockfill sample, and the deformable deformation of the rockfill material in natural environment should be an important part of the late deformation of the rockfill dam. According to the test results, a 4-parameter model describing the deterioration of rockfill materials is established. The initial strain method can be used to calculate the finite element.