Time-Domain Analysis of Tamper Displacement during Dynamic Compaction Based on Automatic Control
Time-Domain Analysis of Tamper Displacement during Dynamic Compaction Based on Automatic Control
复制标题
基于自动控制的强夯过程中夯锤位移时域分析
DOI：
10.3390/coatings11091092
复制
发表时间：
2021-09-01
期刊：
影响因子：
3.4
通讯作者：
Cai, Jun
中科院分区：
文献类型：
--
作者：
Li, Xi;Yang, Hui;Cai, Jun
夯坑深度在强夯法（DC）中是一个关键问题，因为它是强夯法中的一个控制参数以及土壤特性的一个表征指标。本文提出了一个描述夯锤位移时域过程的连续数学模型。该模型简单且所涉及的参数易于获取。研究发现，随着多次夯击，累计夯坑深度增加，但其增量减小。进行了三组10000kN·m的大型强夯试验以评估所提模型的性能。结果表明，所提模型捕捉到了单次和多次夯击时夯锤位移的典型趋势。此外，基于所提模型提出了夯坑深度比的概念，并利用该概念评估强夯效率以及预测强夯的最佳夯击次数。
Crater depth is a vital issue in dynamic compaction (DC) because it is a controlling parameter in DC and a characterization index of soil properties. A continuous mathematical model capturing the time-domain process of tamper displacement is presented in this paper. The model is simple and the parameters involved are easy to obtain. It was found that the accumulated crater depth increases but its increment in the crater depth decreases with multiple impacts. Three groups of large-scale DC tests with 10,000 kN center dot m were conducted to evaluate the performance of the proposed model. The results showed that the proposed model captures the typical trends in the tamper displacement of single and multiple impacts. In addition, a concept of the crater depth ratio is proposed based on the proposed model, and the concept is used to evaluate the efficiency of DC and to predict the optimum tamping number of DCs.