含砾黏土的重复击实特性研究

Repeated Compaction Characteristics of Gravel Clay

利用不同风化程度、不同颗粒级配的碎石配置含砾黏土,并对其进行轻型击实试验,以探讨其在重复击实条件下的击实特性和颗粒破碎规律。结果表明,软弱颗粒含量高的含砾黏土在重复击实作用下,含砾黏土最大干密度增加,最优含水率减小,说明包含软弱颗粒的含砾黏土更易被击实;在5 mm以上粗颗粒均为软弱颗粒条件下,当粗颗粒含量较低时,重复击实对土样最大干密度影响较小,随着粗颗粒含量增加,重复击实条件下含砾黏土最大干密度随之增加。

Gravel clay samples are prepared with crushed rocks under different weathering degrees and particle gradations,and the light compaction tests are carried out to explore its compaction characteristics and particle breakage laws under repeated compaction condition.The research results show that,(a)under the action of repeated compaction,the maximum dry density of the gravel clay with high content of soft particles increases and the optimum moisture content decreases,indicating that the gravel clay containing soft particles is more likely to be compacted;(b)under the condition of the coarse particles with the diameter larger than 5 mm are all soft particles,the repeated compaction has limited effect on the maximum dry density for a low content level of coarse particles,however,as the content of coarse particles increases,the maximum dry density of gravel clay starts to increase under repeated compaction.