【作者】 傅华； 韩华强； 凌华；

【Author】 FU Hua;HAN Hua-qiang;LING Hua;Nanjing Hydraulic Research Institute;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering;Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques,Ministry of Water Resources;

【机构】 南京水利科学研究院； 水文水资源与水利工程科学国家重点实验室； 水利部土石坝破坏机理与防控技术重点实验室；

【摘要】 母岩的性质是影响粗颗粒材料动力特性的重要因素。母岩强度越高,对应的动弹性模量值越大,动永久变形量越小;棱角明显的堆石料在动荷载的作用下较浑圆度较好砂砾石料易产生颗粒破碎,使得其动弹性模量值产生一定的降低,而动永久变形量则产生相应的增加;母岩强度和形状的变化对其动力特性的影响随着围压的提高会变得越来越明显,因此对于高土石坝选用母岩强度高、颗粒浑圆度较好的粗颗粒料作为坝体填筑材料是控制坝体在地震荷载作用下变形、提高坝体整体抗震能力的一种简便易行的方法。更多还原

【Abstract】 The rock property is the important factor to influence the dynamic behaviors of coarse aggregates.The higher the rock strength is,the larger the corresponding dynamic elastic modulus is and the smaller the dynamic permanent deformation is.The rockfill materials with obvious edges under dynamic loads more easily induce particle breakage than the sandy gravel ones with satisfactory roundness,resulting in that the dynamic elastic modulus has certain decrease,while the dynamic permanent deformation has certain increase.The influence of rock strength and shape variation on its dynamic behaviors becomes more and more evident with the increase of the confining pressure.Accordingly,for high earth-rock dams,it is a simple and practical way to control dam deformation and to raise seismic capacity under seismic loads to select the coarse aggregates with high rock strength and satisfactory roundness as dam materials.更多还原