堆石的力学性质  

The Mechanical Properties of Rockfill

作　　者：柏树田[1] 崔亦昊[1] 

机构地区：[1]中国水利水电科学研究院

出　　处：《水力发电学报》1997年第3期21-30,共10页Journal of Hydroelectric Engineering

摘　　要：本文根据部分堆石坝工程的室内堆石试验资料，分析了堆石的力学性质。（１）堆石的压缩变形主要取决于颗粒间抵抗位移的摩擦阻力和岩块的破碎量，岩石坚硬、级配好、孔隙率小，颗粒间摩擦阻力就大，压缩变形就小；（２）堆石的抗剪强度指标（内摩擦角）与其母岩类型、颗粒级配、孔隙率及侧压力等多种因素有关，类似文中提到的几种岩性堆石的抗剪强度指标φｄ可以用φｄ＝５４．４°－１０．４°ｌｏｇ（σ３／Ｐａ）这一关系式近似表达；（３）堆石在平面应变条件下的强度比三轴压缩强度高２°～６°；（４）堆石的应力～应变关系，在平面应变条件下呈应变软化型，在三轴压缩条件下近似弹性应变软化型，而体应变均呈剪胀变形特性。Based on the laboratory experiments of rockfill from several rockfill dams, the mechanical propertis of rockfill are analyzed. (1)The compressive deformation of rockfill is determined by the intergranular friction and the broken amount of rock. Hard well graded rockfill with low porosity can get high intergranular friction and small compressive deformation. (2)The internal friction angle of rockfill is affected by the rock type, its gradation and porosity, and has a nonlinear relation with the confining pressure. For several kinds of rockfill described in this paper, the relation can be expressed as:φ d=54.4°-10.4°log(σ 3/ρ a). (3)The internal friction angles in plain strain conditions are 2°～6° higher than those in triaxial conditions. (4) The stress strain relation curves approximately indicate that these kinds of rockfill have elastic strainsoftening property. Their volumetric strain exhibits dilatency behavior.

关 键 词：堆石材料 压缩变形 抗剪强度 应力应变 堆石坝 

分 类 号：TV641.4[水利工程—水利水电工程] TV41