杂填场地高能级强夯处置停夯标准研究

Study on Standard of Stopping Tamping of High-Energy Dynamic Compaction in Miscellaneous Fill Field

依托离隰高速公路某杂填场地高能级强夯处治工程为研究对象,采用现场试验方法分别对3个高能级强夯的最后两击平均夯沉量限值进行了分析,提出了适用于该工程的停夯标准。研究结果表明:杂填场地由于物质成分复杂,场地均匀性差,宜采用最后两击平均夯沉量作为停夯主控指标。适用于该场地的12000 kN·m、16000 kN·m和25000 kN·m三个能级的最后两击平均夯沉量分别为25 cm、30 cm和35 cm。该次提出的停夯标准也为类似工程和强夯标准的修订提供依据。

In this paper,based on the high-energy dynamic compaction project in a miscellaneous fill field in Lixi Expressway,the limits of average compaction subsidence of the last two times of tamping of three high-energy dynamic compactions were analyzed by field tests,and the standard of stopping tamping fitting to this project was proposed.The results show that due to the complex composition and poor uniformity of the miscellaneous fill field,it is advisable to use the average compaction subsidence of the last two compactions as the main control index to stop tamping.In this case,the average compaction subsidence of three energy levels of 12000 kN·m,16000 kN·m,and 25000 kN·m were 25 cm,30 cm,and 35 cm,respectively.The standard of stopping tamping proposed in this paper can provide a basis for revising similar engineering and dynamic compaction standard.