段伟1,韩云山1,耿少波1,董彦莉1，苏航州2，秦伟华1,董洁1

(1 中北大学土木工程系， 太原 030051; 2 长安大学公路学院， 西安 710064)

［摘要］为了研究强夯法的加固机理，加固效果以及强夯过程中的一些规律，基于相似原理，设计了4000 kN·m能级相似模型试验，分析了夯锤冲击过程的加速度、速度、位移动态变化规律，单点夯沉量与夯击次数变化关系以及有效加固深度影响因素，对夯击能量进行了耗散分析。试验结果表明：夯锤加速度曲线呈现单峰曲线，强夯荷载冲击过程是一次三角形的单一脉冲荷载行程，动应力时程曲线呈抛物线形衰减，单点夯沉量随着夯击次数的增加，初期单击夯沉量大，单击夯沉量快速减小，速率逐渐变缓；后期单击夯沉量比较小，其变化率趋于稳定，收敛于某一值。在试验条件下，给出了强夯施工的技术指标，在已有的有效加固深度计算公式上，建立了量纲统一的有效加固深度的计算公式。

［关键词］强夯； 模型试验； 夯击数； 动应力； 加固深度； 能量耗散

中图分类号： TU472.3+1    文献标识码： A    文章编号： 1002-848X(2015)S2-0265-06

Research on model experiment of dynamic compaction

Duan Wei1, Han Yunshan1, Geng Shaobo1, Dong Yanli1, Su Hangzhou2, Qin Weihua1, Dong Jie1

(1 Partment of Civil Engineering, North University of China, Taiyuan 030051, China;

2 College of Highway, Chang′an University, Xi′an 710064, China)

Abstract： In order to study the reinforcement mechanism of the dynamic compaction method, the reinforcement effect and some regularity in the process of dynamic compaction, based on the similarity principle, the design of indoor model test apparatus, through the device with different energy level dynamic compaction for the indoor model test research and the quantity analysis of the single-point tamping heavy tamping times the relationship between the law and the changing rule of the dynamic stress of soil, the changing rule of the rammer acceleration. According to the deformation of rock mass dissipation theory, analyzed the tamping energy dissipation test results show that the amount of single-point tamping sink gradually reduce with the increase of the number of passes, the cumulative amount of ram sink gradually increase with the increase of the number of passes, and increased with the increase of the depth of the attenuation of dynamic stress, with the improvement of degree of order and stability, tamping ordered degree can be used to maintain and improve the system itself and the stability of energy reduction, spread outward transfer energy increase.

Keywords: dynamic compaction; model test; number of passes; dynamic stress; reinforced depth; energy dissipation

*国家自然科学基金（51208473、51408558）,山西省科技攻关项目（20130313010-3）。

作者简介：段伟，硕士，Email:zbdxdw@163.com。