单轴压缩下高含石量胶凝堆石料的力学特性

通过高含石量(70%,80%,90%)的不同尺寸的胶凝堆石料重塑样的单轴压缩试验,研究了含石量和尺寸效应对破坏形态和力学特性的影响.并结合数值模拟解释了试验现象.结果表明:随着含石量的升高,压应力区与拉应力区相互交错分布,最终破坏时,受张拉破坏和剪切破坏共同作用.破坏形式从张拉劈裂破坏的一条曲折延伸的裂纹,逐渐转变为多条裂纹的剪切-张拉复合破坏模式,并伴随着局部区域颗粒的崩落.尺寸效应对重塑样的破坏形态影响不明显,而对力学性质有显著的影响,大尺寸试样的力学性质较差.

Mechanical Characteristics of Cemented Rockfill Materials with High Rock Block Proportions Under Uniaxial Compression

Artificial specimens of cemented rockfill materials with high rock block proportions (70%， 80%， 90%) were fabricated for uniaxial compression to understand the effects of rock block proportion and size effect on the failure modes and mechanical characteristics. The observed experimental phenomena were explained by numerical simulation. Results show that with the increase of rock block proportion， zones of both tensile stress and compressive stress develop as staggered distribution so that failure mode is dependent on the splitting failure and the shear failure. Increasing rock block proportion changes a tortuous failure surface contributed by splitting failure to multiple failure surfaces and detachment of rock particles along the periphery of specimens to form the compound failure mode combining splitting failure and shear failure. The size effect does not play any role in failure modes， but do play prominent role in mechanical characteristics. Mechanical properties of bigger samples are worse than those of smaller samples.