黏性粗粒土压实特性试验研究

Experimental Study on the Compaction Property of Sticky Coarse Grained Soil

为研究黏性粗粒土压实特性的影响因素,采用自制大型击实仪对不同级配的黏性粗粒土进行不同击实功的击实试验。结果表明：粒径大于5 mm的砾石含量P5是影响黏性粗粒土最大干容重的重要因素,当P5的含量为40%~65%时能获得最佳压实效果;黏性粗粒土最优含水率与P5含量呈良好的线性相关关系,粗粒颗粒级配越差,颗粒越均匀,其表现的线性规律越明显;击实过程中,黏性粗粒土破碎率为30%~45%时,土样能获得最大干容重,而且土样级配越好,获得最大干容重所要求的粗粒含量降低率越小。

In order to study the influencing factors of viscous coarse grained soil compaction characteristics, it adopted self-made large-scale compaction apparatus to do compaction test of different compaction power on sticky coarse grained soil with different grades of different coarse- grained soil contents. The results show that the coarse grained soil content is the direct reason that affects the maximum dry density of sticky coarse grained soil and from 40% to 65% of the coarse aggregate particle size greater than 5 mm of gravel（P5 ） content can reach the best compaction effect; optimum moisture content of sticky coarse grained soil and P5 content have good linear relationship, coarse grain size dis- tribution, particle, the more homogeneous, the linear relationship more obvious; on the compaction process, soil samples can get the maxi- mum dry density when the sticky coarse grained soil broken rate is from 30% to 45%, and the better the grain composition will be, the com- paction property of sticky coarse grained soil is better.