对湿陷性黄土在强夯作用下冲击应力的分析  

Analysis of the Impact Stress during Dynamic Compaction on Collapsible Loess

作　　者：水伟厚[1] 王铁宏[2] 王亚凌 

机构地区：[1]同济大学地下系,上海200092 [2]中国建筑科学研究院,北京100013 [3]中化岩土工程有限公司,北京102600

出　　处：《建筑科学》2003年第1期33-36,共4页Building Science

摘　　要：从动力平衡方程式出发,对土体的屈服滞后现象运用碰撞理论,并考虑参振土体对夯锤速度的影响进行了研究。提出了其边界条件中的初速度应为形变过程初速度,导出了强夯冲击应力时程关系的解析式,明确了恢复系数及速度效应在强夯冲击应力中的显著作用。并与某湿陷性黄土强夯加固工程的实测冲击应力结果对比,所得结论对强夯工程设计具有重要的参考价值。In this paper, based on the kinetic balanced equation , t he phenomenon of Delayed Yield on soil in dynamic compaction is studied by impac tion theory considering the influence of soil of vibration. It is presented that the initial speed of boundary condition should be the initial velocity of the c ourse of deformation. The solutions of the relation between impact stress and ti me have been presented and the key role of restitution coefficient and velocity effect in the impact stress has been defined. Moreover, comparing calculated val ue with experimental data proves the reliability of the proposal method, and the results in this paper would be a valuable reference to the geotechnical design in dynamic compaction.

关 键 词：强夯法 碰撞理论 冲击应力 恢复系数 

分 类 号：TU475.3[建筑科学—结构工程] TU472.31[建筑科学—土工工程]