颗粒破碎对堆石料静动力特性影响的试验研究

开展了堆石料的大型静力三轴试验和动力三轴试验,研究了级配与颗粒破碎对静力力学特性的影响,讨论了动静力力学特性的相似性。研究表明当细颗粒含量在30%以内时,堆石料的强度指标和弹性模量随细颗粒含量的明显增加而提高;颗粒破碎对堆石料的力学特性影响较大,堆石料的颗粒破碎程度随细颗粒含量的增加而减少,随应力的增大而增大。研究还表明,堆石料的动力力学特性与静力力学特性具有相似性,当细颗粒含量增加后,级配趋向优良,堆石料的最大动模量和抵御地震残余变形的能力得到了提高。

Experimental Study on Effects of Particle Breakage on Static and Dynamic Characteristics of Rock-fill Materials

The static and dynamic characteristics of rock-fill materials are experimentally studied by large-scale triaxial tests,and the effects of grain size composition and particle breakage on static characteristics are discussed and analyzed.The results show that when the content of fine-grained rock-fill materials is less than 30%,the strength indexes and elastic modulus of the materials increase with increasing of the content.The particle breakage decreases with increasing of fine-grained content,and increases with increasing of stress.It is also show that the static characteristics and dynamic characteristics of rock-fill materials have similar properties. The maximum dynamic modulus and the capacity against deformation are increased with increasing of the fine-grained content.