强夯法在湿陷性粉土路基中的应用研究  

Application of Dynamic Compaction in Collapsible Silt Subgrade

作　　者：连昕 LIAN Xin(Shanxi Highway Engineering Supervision Consulting Co.,Ltd.,Taiyuan,Shanxi 030006,China)

机构地区：[1]山西省公路工程监理技术咨询有限公司,山西太原030006

出　　处：《山西交通科技》2021年第4期19-21,共3页Shanxi Science & Technology of Transportation

摘　　要：为了研究强夯法在湿陷性粉土路基中的适用性,选取了4组相同夯击能下不同锤重与落距组合进行研究,对夯沉量与物理力学指标进行测试,并通过平板荷载试验与动力标贯检测对地基承载力进行检验,通过灌砂法检测了压实度。结果表明:随着锤重的增加与落距的减小,达到同样的夯沉量所需的锤击次数越来越少,重锤低落距的效率更高;经处置后,土体物理力学指标提升明显,可以减少弹簧土等病害。地基承载力特征值均大于设计要求,验证了在重锤低落距的组合下,沉降更小,地基承载力更高;压实度均高于处治前,符合规范要求,重锤低落距的组合更易于压实。从试夯试验结果与技术经济性的角度考虑,建议湿陷性粉土路基强夯法采用12 t重锤,落距取4 m。In order to study the applicability of the dynamic compaction in the collapsible silt subgrade,under the same tamping energy, selecting four different combinations of hammer weight and drop distance to test the settlement and physical and mechanical indexes. The bearing capacity of the foundation was tested by the plate loading test and the dynamic standard penetration test, and the compactness was tested by the sand-replacement method. The results showed that, with the increasing hammer weight and decreasing drop distance, less hammer times were need to achieve the same amount of settlement, and the efficiency of the combination of heavy hammer and low drop distance was higher. After the treatment, the physical and mechanical indexes of soil mass were improved significantly, and the disease such as spring soil could be reduced. Under the combination of heavy hammer and low drop distance, the settlement was less, the bearing capacity of the foundation was greater, and the compactness was higher. Considering the test results and technical economy, it is suggested that the combination of heavy hammer of 12 t and drop distance of 4 m should be used in the dynamic compaction for the collapsible silt subgrade.

关 键 词：粉土路基 强夯法 锤重 落距 地基承载力 

分 类 号：U416.16[交通运输工程—道路与铁道工程]