酸性干湿循环灰岩单轴压缩细观劣化三维离散元分析

Three-dimensional Discrete Element Analysis of Meso-deterioration of Acidic Wet-dry Cycle Uniaxial Compression Limestone

针对酸性干湿循环作用下岩体力学性能劣化导致岩体失稳问题,以酸雨地区灰岩为研究对象,利用3DEC离散元数值模拟软件对该地区干湿循环作用下灰岩单轴压缩试验进行模拟,推演不同酸性环境中循环周期对岩样细观参数劣化的影响规律,在此基础上预演更多循环次数作用下灰岩单轴压缩试验,获得了细观参数和峰值应力与循环次数的关系。结果表明:模型的细观参数随着干湿循环次数的增加而逐渐减小,总劣化度逐渐增大;干湿循环对灰岩的劣化作用随着循环次数增加,作用逐渐减弱;溶液pH值越低,峰值应力变化速率越快。

In view of the instability of rock instability caused by deterioration of rock mechanical properties under the action of acid dry-wet cycle,the limestone in acid rain area is taken as the research object,and 3DEC discrete element numerical simulation software is used to simulate the uniaxial compression test of limestone under the action of dry-wet cycle in this area,and the influence rule of cycle cycle on the deterioration of mesometric parameters of rock samples in different acidic environments is deduced.On this basis,the uniaxial compression test of limestone under the action of more cycles is performed,and the relationship between mesospheric parameters and peak stress and cycle times is obtained.The results show that the mesoscopic parameters of the model decrease with the increase of the number of dry-wet cycles,and the total deterioration degree increases gradually.The deterioration effect of wet and dry cycles on limestone decreases with the increase of cycles.Solution pH value the lower the pH value,the faster the peak stress change rate.