基于几何相似法的超粒径碎石土击实特性

唐亮¹，季宏宇²，张晓飞¹，张欣¹，胡朋^2*，郑军涛¹，王树平³

1.山东省路桥集团有限公司，山东 济南  250014；2.山东交通学院交通土建工程学院，山东 济南  250357；

3.山东现代学院工学院，山东 济南  250104

摘要：为研究超粒径土石混合料的压实特性，采用几何相似法、等量替代法和剔除法对土石混合料的原始级配进行超粒径处理，确定该现场土石混合料的最佳超粒径处理方法；通过重型击实试验，分析击实次数和含石率对新级配土石混合料干密度的影响；采用加州承载比（California bearing ratio，CBR）试验评价现场土石混合料的承载能力。结果表明：综合考虑等效处理方法对土石混合料级配和最大干密度的影响，选择几何相似法为该现场土石混合料的最佳等效处理方法；超粒径土石混合料的干密度与总击实次数间存在指数函数关系，现场土石混合料的最佳击实次数为150，最佳含石率为70%，最大加州承载比为10.7%。

关键词：土石混合料；等效处理；击实试验；CBR；最佳含石率；几何相似法

Compaction characteristics of granular soil based on geometrical similarity

TANG Liang¹, JI Hongyu², ZHANG Xiaofei¹, ZHANG Xin¹, HU Peng^2*, ZHENG Juntao¹, WANG Shuping³

1.Shandong Luqiao Group Co., Ltd., Jinan 250014, China; 2.School of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China; 

3. College of Engineering, Shandong Xiandai University, Jinan 250104, China

Abstract: In order to study the compaction characteristics of supergranular soil and gravel mixtures, the geometricsimilarity method, the equivalent substitution method, and the rejection method are used to supergranularize the original gradation of soil and gravel mixtures, and to determine the optimal supergranularization method for soil and gravel mixtures at this site. The effects of the number of blows and stone content on the dry density of freshly graded soil and gravel mixtures are analyzed by means of heavy-duty compaction tests; and the bearing capacity of soil and gravel mixtures in the field is evaluated using the California bearing ratio (CBR). The results show that considering the effect of the equivalent treatment method on the gradation and maximum dry density of the soil and gravel mixture, the geometric similarity method is the best equivalent treatment method for the soil and gravel mixture at this site. There is an exponential function between the dry density of the supergranular soil and gravel mixture and the total number of blows. The optimum compaction times for the on-site soil-rock mixture is 150. The optimum rock content of the on-site soil and gravel mix is 70% with a CBR value of 10.7%.

Keywords: soil-rock mixture; equivalence treatment; compaction test; CBR; optimum rock content; geometric similarity method