就地固化技术在牛田洋快速通道项目中的应用

Application of In-situ Solidification Technology in the Niutianyang Expressway Project

针对汕头市牛田洋快速通道沿线软土深厚、周边环境敏感的特点,提出采用就地固化技术先对软土进行浅层处理,再结合排水固结法或复合地基法进行深层处理的联合处治方法,并给出固化土层质量检测标准。在大规模施工前选取局部路段对水泥掺量分别为3%、4%、5%的固化剂进行配合比试验,试验结果表明3种固化剂配合比均能满足设计强度和承载力要求,从统计结果看水泥掺量4%的固化剂表现最优。利用大规模施工过程中的质量检测数据作为样本进行相关性分析,得到固化土强度与龄期之间的关系,为同类项目就地固化设计时强度取值提供参考。

In response to the characteristics of deep soft soil and sensitive surrounding environment along the Niutianyang Expressway in Shantou City,a joint treatment method is proposed to use in-situ solidification technology to first treat the soft soil in shallow layers,and then combine drainage consolidation method or composite foundation method for deep treatment,and provide quality inspection standards for solidified soil layers.Before large-scale construction,local road sections were selected to conduct mix proportion tests on curing agents with cement content of 3%,4%and 5%,respectively.The test results showed that all three types of curing agent mix proportions can meet the design strength and bearing capacity requirements.From the statistical results,it can be seen that the curing agent with cement content of 4%performs the best.Using quality inspection data from large-scale construction processes as samples for correlation analysis,the relationship between the strength of solidified soil and its age was obtained,providing reference for the strength values of solidified soil at different ages in similar projects.