Research and application on effective pavement contact width of doubledrum vibratory roller(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年02期
- Page:
- 120-126
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Research and application on effective pavement contact width of doubledrum vibratory roller
- Author(s):
- JIAO Shengjie; XU Qinggang; LIU Qiubao; ZHANG Cuihong
- （1． Highway Maintenance Equipment National Engineering Laboratory， Changan University， Xian 710064，Shaanxi， China； 2． Sany Heavy Industry Co., Ltd., Changsha 410100， Hunan， China）
- Keywords:
- mechanical engineering; doubledrum vibratory roller; effective contact width; degree of overlap; compaction velocity; vibration frequency
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to improve the compaction quality and compaction efficiency of doubledrum vibratory roller on pavement, the good matching relationship between compaction velocity and vibration frequency was determined. From the analysis on contact section between doubledrum vibratory roller and pavement, and on the basis of halfpower point, the concept of effective contact width of doubledrum vibratory roller was put forward and its mathematical model was presented. Based on the existing impact spacing theory, the degree of overlap was introduced to redefine the corresponding relation of compaction velocity and vibration frequency. And the model of effective contact width and index of overlap degree were used in the compaction test of asphalt mixture to verify it. The results show that the conceptual model of effective contact width can be used as the theoretical basis for selecting the process parameters combination of doubledrum vibratory roller. It can be pointed out that with increasing rolling times in the compaction process, material is changed from plastic to elastic and correction coefficient of effective contact width gradually changes from 0.5 to 1.0. By controlling the size of degree of overlap, materials after the same compaction times will have different degree of uniformity. When the selected degree of overlap obtains good uniformity, the corresponding compaction velocity and vibration frequency has good matching relationship. The compaction test results of AC13 asphalt mixture are in good agreement with the theoretical results. When the variation coefficient is 0.4%, compaction uniformity and compaction efficiency can be guaranteed. Then the compaction velocity of roller in every compaction time under high frequency vibration is also obtained. The pavement compactness and smoothness are in accordance with the acceptance standard of asphalt mixture highway. The parameter combination of compaction velocity and vibration frequency determined by the model of effective contact width and the concept of overlap degree provides a theoretical guarantee for improving the quality of pavement compaction. 2 tabs, 10 figs, 25 refs.
Last Update: 2018-04-03