1. State Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining & Technology,Xuzhou　 221116,China;2. School of Mechanics & Civil Engineering,China University of Mining & Technology,Xuzhou　 221116,China

为研究满足连续级配的饱和破碎岩石压实特性及压实前后岩石粒径的分布规律,利用MTS816.03岩石力学试验系统及自制装置对满足Talbol分布的饱和破碎岩石进行压实试验研究。分析了Talbol指数对割线模量、切线模量、孔隙率、碎胀系数和压实度的影响,讨论了分布系数r随Talbol指数和轴向应力的变化规律,建立了一种反映颗粒粒径分布变化的破碎岩石应力-应变关系。研究表明:破碎岩样在承载过程中,割线模量、切线模量、孔隙率、碎胀系数、压实度与Talbol指数n呈负相关关系。分布系数r随轴向应力的增大而减小;且在轴向应力小于单轴抗压强度的50%时,分布系数r随n呈增大趋势;当轴向应力大于单轴抗压强度的50%时,破碎岩样分布系数r与n的关系出现波动;当轴向应力达到单轴抗压强度的90%后,不同n的破碎岩样分布系数r趋于一致。

In order to study the compaction characteristics and particles size distribution of saturated broken rock of continuous gradation,an experimental study was conducted on saturated broken rock which satisfies the Talbol distri- bution by using self-made equipment and MTS816. 03 rock mechanics test system. The influences of n on the secant modulus,the tangent modulus,the porosity,the bulking factor and the compactness were analyzed. The variation laws of distribution coefficient r with Talbol index and axial stress were investigated. The stress-strain relationship of broken rocks was established,which can reflect the variation of particle size distribution. The results show that the secant mod- ulus,the tangent modulus,the porosity,the bulking factor and the compactness of rock samples were negatively related with the Talbol index n in the bearing process of broken rock samples. The distribution coefficient r decreased when axial stress increased. And the distribution coefficient r tended to increase with n,when the axial stress was less than 50% of the uniaxial compressive strength. When the axial stress was more than 50% of the uniaxial compressive strength,the relationship between distribution coefficient r of broken rock samples and n fluctuated. The distribution coefficient r of different n tended to be uniform with the axial stress exceeded 90% of the uniaxial compressive strength.

国家自然科学基金资助项目(51404266,11502229)；国家重点基础研究发展计划(973)资助项目(2013CB227900)；

Feng Meimei,Wu Jiangyu,Chen Zhanqing,et al. Experimental study on the compaction of saturated broken rock of continuous gradation [J]. Journal of China Coal Society,2016,41(9):2195-2202.