土石比对高填方碎石土地基强夯加固影响试验研究  

Experimental Study on the Influence of Soil-Rock Ratio on the Dynamic Compaction Reinforcement Effect of High Fill Gravel Soil Subgrade

作　　者：仇志龙 吴嘉栋 万鹏 梁宁慧[2] 赵奎 Qiu Zhilong;Wu Jiadong;Wan Peng;Liang Ninghui;Zhao Kui(The First Engineering Co.,Ltd of China Railway Seventh Group,Xianyang,Shaanxi 712099,P.R.China;School of Civil Engineering,Chongqing University,Chongqing 400045,P.R.China)

机构地区：[1]中铁一局集团第七工程有限公司,陕西咸阳712099 [2]重庆大学土木工程学院,重庆400045

出　　处：《地下空间与工程学报》2025年第1期123-130,共8页Chinese Journal of Underground Space and Engineering

摘　　要：为研究强夯对高填方碎石土地基承载力和沉降变形的影响,以重庆某高填方地基的碎石土填料作为主要研究对象,根据现场典型级配对填料进行尺寸缩尺,采用击实试验确定碎石土料的最优土石比。通过现场强夯试验研究3组不同土石比(4∶6;3∶7;6∶4)碎石土地基的沉降量及动力触探击数,探讨土石比对强夯加固效果的影响。结果表明:土石比是影响填料压实质量的关键因素,土石比4∶6的击实效果最佳;在3000 kN·m的夯击能作用下,不同土石比的最佳夯击次数均为7~8击,土石比4∶6的累积夯沉量最大,夯沉量离散程度高;强夯后深度2~4 m内碎石土地基的平均动力触探击数显著提高,其中土石比4∶6的有效加固深度最大;夯后各土石比加固效果提高幅度依次为土石比(4∶6)>土石比(3∶7)>土石比(6∶4)。To investigate the effect of dynamic consolidation on bearing capacity and settlement deformation of high-fill gravel soil foundation,the gravel soil filler of a high-fill roadbed in Chongqing is taken as the main research object.According to the typical gradation of the site,apply a scale reduction to the filler size.the optimal soil-rock ratio of gravel soil material was determined by compaction test.Through the field dynamic consolidation test,the settling volume of gravel soil foundation and blow count of dynamic sounding under three different soil-rock ratios(4∶6;3∶7;6∶4)were studied,and the influence of the soil-rock ratio on the reinforcement effect of dynamic consolidation was discussed.The test results show that the soil-rock ratio is the key factor affecting the compaction quality of the filler and the compaction effect of the soil-rock ratio of 4∶6 is the best;Under the application of tamping energy of 3000 kN·m,the optimal tamping times of different soil-rock ratios are 7~8,the cumulative tamping settlement of soil-rock ratio 4∶6 is the largest and the discrete degree of tamping settlement is large;After dynamic compaction,the average blow count of dynamic sounding of gravel soil foundation in the depth of 2~4 m is significantly increased,and the effective reinforcement depth of soil-rock ratio 4∶6 is the largest;After tamping,the increased range of reinforcement effect under different soil-rock ratios is in the order of soil-stone ratio(4∶6)>soil-stone ratio(3∶7)>soil-stone ratio(6∶4).

关 键 词：土石比 击实试验 碎石土地基 强夯 动力触探 

分 类 号：TU470[建筑科学—结构工程]