【作者】 杜俊； 侯克鹏； 梁维； 彭国诚；

【Author】 DU Jun,HOU Ke-peng,LIANG Wei,PENG Guo-cheng (Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China)

【机构】 昆明理工大学国土资源工程学院；

【摘要】 对多个级配不同含水率的粗粒土进行击实试验,研究粗粒土的压实特性和颗粒破碎分形特征。结果表明,粗粒土最大干密度随级配中粗粒含量的增大而增大,当粗粒含量P₅=70%时,最大干密度出现最大值;当P₅>70%时,最大干密度又随粗粒含量的增大而减小,粗粒土击实破碎后的粒径分布具有良好的分形特性,破碎分形维数为2.2790～2.8922,均大于击实前粗粒土粒度分形维数;相同级配条件下,粗粒土破碎分形维数随含水率的增大而增大,且粗粒含量P₅>50%时,增幅显著;粗粒土破碎分形维数D与破碎率B_g存在良好的线性关系,且击实前后粗粒土粒度分形维数差值能客观表征颗粒破碎的程度;粗粒含量和含水率是影响颗粒破碎率的两个重要因素,但相对于含水率而言,粗粒含量对破碎率的影响更加显著。更多还原

【Abstract】 Based on compaction test of different gradations and different moisture contents of coarse-grained soils,the compaction characteristics and fractal feature of coarse-grained soils are studied.The results show that the maximum dry density of coarse-grained soils would increase with the increase of coarse grained content in gradation.The maximum dry density reach the maximum value as the coarse grained content is 70%;while it would decrease with the increase of coarse grained content in gradation as the content is more than 70%.The particle size distribution of crushing granular has a good fractal feature.The crushing fractal dimensions are between 2.279 0—2.892 2;higher than that before test.Under the same gradation condition,the crushing fractal dimension of coarse-grained soils increased with moisture content.The increase amplitude is obvious when P₅ is larger than 50%.A good linear regression relation exists between crushing fractal dimensions D and broken rate B_g.Difference value of the granularity fractal dimension before and after compaction can show the crushing degree of coarse-grained soils objectively.Coarse grained content and moisture content are two key factors affected on particle breakage;but the influence of coarse grained content is more obvious.更多还原