破碎性堆石料单剪试验研究

介绍了自行研制的叠环式大型单剪试验仪。对两种不同岩性的堆石料进行了不同竖向应力条件下大变形的单剪试验,分别研究了竖向应力施加过程(压缩过程)及单剪过程中颗粒破碎的变化。试验结果表明:颗粒破碎与颗粒抗压强度及施加的竖向应力有关,颗粒抗压强度小及施加的竖向应力大,压缩过程与剪切过程中颗粒破碎率大;无论是压缩过程还是剪切过程,颗粒破碎均存在一个临界值;颗粒破碎主要发生在压缩或剪缩过程中。

Simple shear tests on breakable rockfill materials

A large-scale simple shear test device with staged shearing rings is developed. A series of simple shear tests are conducted on two different rockfill materials with different particle compressive strengths under different vertical stresses and large shear deformations. Changes of particle breakage during compression and simple shearing are investigated. The results show that the particle breakage relates with the compressive strengths of particles and the applied vertical stresses. The lower the particle compressive strength is and the higher the vertical stresses are, the larger the particle breakage takes place during the compression and the simple shearing process. The particle breakage may tend to a critical value either during the compression or the shearing process. The particle breakage mainly occurs in the process of the confined or shearing compression.