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DEM simulation of the size effect on the wetting deformation of rockfill materials based on single-particle crushing tests
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.compgeo.2019.103429
Xiao-quan Shao , Shi-chun Chi , Yong Tao , Xiong-xiong Zhou

Abstract Rockfill materials undergo additional deformation when immersed in water under constant-stress conditions. This phenomenon caused by flooding is called wetting deformation. Researchers have investigated wetting deformation via many factors through laboratory tests on scaled materials. However, the size effect on wetting deformation has seldom been studied due to the limited size of test equipment. To investigate this topic, a set of single-particle crushing tests was conducted on Gushui rockfill materials under wet and dry conditions, and triaxial wetting tests of samples with different grain sizes under constant confining pressure and stress ratio conditions were simulated by discrete element method (DEM). The single-particle crushing tests showed that wetting significantly reduced particle strength and stiffness and that particle strength decreased with increasing particle size. The stress-strain curves obtained by the DEM simulations were in good agreement with the experimental results. The wetting deformation of the large-sized sample was larger than that of the small-sized sample, especially under a high stress ratio and confining pressure. The wetting volumetric and axial strains had a linear relationship during flooding, and their ratio was greatly affected by the stress ratio. The size effect on wetting behavior should not be ignored, especially for high-rockfill dams.

中文翻译:

基于单颗粒破碎试验的堆石料润湿变形尺寸效应的DEM模拟

摘要 堆石材料在恒应力条件下浸入水中时会发生附加变形。这种由浸水引起的现象称为润湿变形。研究人员通过对缩放材料的实验室测试,研究了多种因素导致的润湿变形。然而,由于测试设备的尺寸有限,很少研究尺寸对润湿变形的影响。为研究这一课题,对固水堆石料在干湿条件下进行了一组单颗粒破碎试验,并采用离散元法模拟了不同粒度样品在恒定围压和应力比条件下的三轴润湿试验( DEM)。单颗粒破碎试验表明,润湿显着降低了颗粒强度和刚度,颗粒强度随着颗粒尺寸的增加而降低。通过 DEM 模拟获得的应力-应变曲线与实验结果非常吻合。大尺寸试样的润湿变形大于小尺寸试样,尤其是在高应力比和围压下。浸水过程中润湿体积应变与轴向应变呈线性关系,其比值受应力比影响较大。不应忽视尺寸对润湿行为的影响,特别是对于高堆石坝。大尺寸试样的润湿变形大于小尺寸试样,尤其是在高应力比和围压下。浸水过程中润湿体积应变与轴向应变呈线性关系,其比值受应力比影响较大。不应忽视尺寸对润湿行为的影响,特别是对于高堆石坝。大尺寸试样的润湿变形大于小尺寸试样,尤其是在高应力比和围压下。浸水过程中润湿体积应变与轴向应变呈线性关系,其比值受应力比影响较大。不应忽视尺寸对润湿行为的影响,特别是对于高堆石坝。
更新日期:2020-07-01
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