石膏颗粒接触试验研究

Experimental Study on Contact of Gypsum Particles

摘要:

利用岩石双轴流变试验仪，研究了石膏试件在单轴压缩和颗粒接触条件下的力学特性和破坏模式.结果表明：圆柱单轴压缩试件破坏模式为均匀受力下的一次性剪切破坏，球形颗粒接触试件破坏模式为应力集中下的颗粒破碎多次破坏；在利用离散元模型进行模拟时，同种材料单轴压缩试验的细观参数与颗粒接触试验的细观参数相差较大，不同的受力情况需要分别进行标定.

Abstract:

Uniaxial compressive tests and particle contact tests were conducted to investigate mechanical properties and failure modes of gypsum test specimens using rock rheological testing system. Results show that cylinder specimens under the uniaxial compression tests fail directly in condition of uniform stress, while spherical specimens under the contact tests fail repeatedly with particle breakage in condition of stress concentration. In addition, even for the same kind of material, microscopic calculation parameters vary greatly with discrete element model. The microscopic calculation parameters of the specimens under different kinds of stress situation need to be calibrated separately.