千枚岩及灰岩路基填料击实特性试验研究  

Experimental Study on Compaction Characteristics of Subgrade Filling Materials for Phyllite and Greywacke

作　　者：罗佳 杨长卫[1] 徐贤青 包杰 马洪生 丁选明[4] LUO Jia;YANG Changwei;XU Xianqing;BAO Jie;MA Hongsheng;DING Xuanming(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Provincial Transportation Engineering Quality Supervision Station,Chengdu 610031,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu 610041,China;School of Civil Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]四川省交通工程质量监督站,成都610031 [3]四川省公路规划勘察设计研究院有限公司,成都610041 [4]重庆大学土木工程学院,重庆400044

出　　处：《铁道建筑》2024年第8期117-122,共6页Railway Engineering

基　　金：四川省交通运输科技项目(2023-A-03);四川省科技计划(2024YFHZ0121)。

摘　　要：针对我国西南地区以千枚岩和灰岩为主的路基填料难以直接使用的问题,通过正交试验的方法对千枚岩和灰岩开展室内击实试验并进行正交分析,探讨击实过程中填料压实度的主控影响因素并得到压实最优组合。结果表明:千枚岩的最优含水率在4%~6%,灰岩的最优含水率在6%~8%;击实试验中击实98次对土样的压实度改变率影响最大;与路基施工所用的强弱振碾压组合相结合,计算出能满足目标压实度的最优组合模式为强振8遍、弱振2遍。In response to the problem of difficulty in directly using subgrade fillers mainly composed of phyllite and greywacke in southwestern China,indoor compaction tests were conducted on phyllite and greywacke using orthogonal experimental methods.The orthogonal analysis was carried out to explore the main controlling factors of filler compaction during the compaction process and obtain the optimal compaction combination.The results show that the optimal moisture content of phyllite is at 4%~6%,and the optimal moisture content of greywacke is at 6%~8%.At the same time,it was found in the compaction test that the 98 times of compaction had the greatest impact on the change rate of soil compaction degree.Combined with the combination of strong and weak vibration compaction used in subgrade construction,the optimal combination mode that can meet the target compaction degree was calculated as 8 times of strong vibration and 2 times of weak vibration.

关 键 词：铁路路基 击实试验 千枚岩 最大干密度 最优含水率 强弱振碾压 

分 类 号：U213.1[交通运输工程—道路与铁道工程]