土石混填高路堤快速施工试验研究

Research on Rapid Construction of High Embankment Filled with Earth-Rock Mixtures

文中研究以某快速路项目为依托,设置两个试验段,在边坡坡面向内2m区域分别松铺4.5m、8m土石混合填料,填筑后进行强夯加固,以探讨研究土石混填高路堤的快速施工技术和方法。对强夯后的路基反开挖,并进行了压实度和承载力检测。通过试验段检测数据分析可知,松铺4.5m试验段的压实度和承载力基本可以达到设计要求,部分压实度稍不理想。在后续施工中,可采用将上下两层夯点错开设置的方法有效避免夯棱压实度欠缺影响,达到土石混填高路堤的快速施工和经济安全的目的;但在路基一级边坡即路面以下8m范围内建议采取分层填筑、分层碾压的施工工法。而松铺8m试验段的压实度和承载力不能满足设计要求。

Based on an Expressway Project,two test sections are set up in this study,the earth-rock mixtures are loosely filled within 2mof the inner side of the slope,with filling thickness of 4.5mand 8m respectively.The dynamic consolidation is carried out after filling to study the rapid construction technology and method of high embankment filled with earth rock mixture.After dynamic compaction,t he subgrade is back excavated to check the compactness and bearing capacity.According to the analysis of the test data,the compactness and foundation bearing capacity of the loose paving 4.5 mtest section can basically meet the design requirements,and local compactness is not ideal.In the follow-up construction,the method of staggering the compaction points of the upper and lower layers can effectively avoid the problem of insufficient compaction of the edge of the ramming pits,so as to achieve the purpose of rapid construction,economy,and safety of the high embankment filled with the earth-rock mixture.However,the construction method of layered filling and layered rolling is recommended for the first-grade slope of subgrade,i.e.8mbelow the pavement.And the compactness and bearing capacity of the loose paving 8m test section can not meet the design requirements.