挤密桩夯填过程的塑性分析

挤密桩夯填过程中,土体的塑性变形分析多采用Mohr-Coulomb强度准则,未考虑中间主应力的影响。为了全面考虑土体的三向应力状态,采用统一强度理论和厚壁圆筒理论,对挤密桩夯填施工阶段的受力状态进行了分析,得出了土体夯填塑性影响比例半径计算公式的统一解,散体模型和理想弹塑性模型公式为其特例。该公式适用于不同土体材料夯实塑性影响区的计算,可以用于分析夯实土体所需能量,从而确定重锤的质量、落距以及夯击次数。

Plastic analysis of closely compacted pile in tamping processes

In dynamic compaction and filling processes of compaction pile,plastic analysis of soil often uses the Mohr-Coulomb criterion,which doesn't consider the middle principal stress.For considering triaxial stress condition,based on Yu's unified strength theory and cylinder with thick wall theory,this paper anlayzes the stress state of compacted pile in tamping process to get the unified solution of proportion radius of closely compacted pile under tamping process.Bulk model and elsto-perfectly plastic model are special cases of the unified solution indices.The new formula can be used to predict soil plastic zone during tamping process.So the energy,weight,vertical distance of temper and tamping times can be confirmed.4 figs,10 refs.