级配对堆石料颗粒破碎及力学特性的影响

Effect of Grain Size Composition on Particle Breakage and Mechanical Properties of Rock-fill Materials

级配是影响堆石料颗粒破碎和力学特性的重要因素。为研究级配对堆石料强度和变形特性的影响,开展了3种堆石料的大型三轴排水剪切试验;同时为分析不同级配堆石料的颗粒破碎特性,对试验前后试样进行了颗分试验。试验结果表明,颗粒破碎率随应力的增大而增大,在同一围压情况下,相比于细颗粒含量高的堆石料,细颗粒含量少的产生的颗粒破碎率要大。随细颗粒含量的增加,强度指标变大,抵御变形能力增强,剪切过程中产生的体积变形小,剪胀更为明显。

The grain size composition is the important factor for the particle breakage and mechanical properties of rock-fill materials.In order to study its effects on the strength and deformation characteristics of grain size composition,the large-scale triaxal tests for three groups of rock-fill materials are conducted;simultaneously,in order to analyze the particle breakage characteristics in different grain size compositions,the grading tests on the specimens before and after the triaxial test are done also.The results show that the particle breakage ratio is increased with stress,and the particle breakage ratio is increased with the decreasing of the fine-grained contents under the same of confining pressure.The strength indexes and elastic modulus are increased with the increasing of fine-grained contents,and the bulk strain is increased with the increasing of particle breakage.