挤密砂桩在公路软基处理中的应用——以韩江平原地区为例

Application of compaction sand piles in soft ground improvement of highway --Taking Hanjiang River plain region as an example

以韩江平原地区为例 ,介绍了大头型活瓣桩尖振动挤密砂桩施工方法 ,该方法具有桩体密度大、充盈系数高、加固效果显著以及工期短的特点 .通过振冲加固 ,土层地震液化现象得以消除 ,对地基土起置换作用、竖向排水作用和挤密作用 ,使地基强度得到提高 ,改善地基的整体稳定性 ,并且均匀化 ,变形较小 ,能满足公路通车荷载的要求 ,节约投资 .

In this paper, taking Hanjiang River plain region as an example, the construction of vibration compaction sand piles with movable pile shoes is introduced, which can be opened automatically. The piles are characterized of high density, great fullness coefficient, distinct ground improvement effect, and short construction period. Through the effect of replacement, vertical drainage and compaction with vibroflotation method, the earthquake liquefaction of the ground soil is eliminated, the strength, global stability and uniformity of the ground soil are improved, the ground deformation is attenuated to satisfy the requirement of the vehicle loading, and the investment of the highway is saved.