Practical calculation method for column radius by single fluid jet grout system(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年04期
- Page:
- 92-97
- Research Field:
- Publishing date:
Info
- Title:
- Practical calculation method for column radius by single fluid jet grout system
- Author(s):
- WANG Zhi-feng; XIANG Qing-ming; CHEN De-yun; XIE Yong-li
- 1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Key Laboratory for Highway Bridge and Tunnel Engineering of Shaanxi Province, Chang’an University, Xi’an 710064, Shaanxi, China; 3. Wenzhou Traffic Quality Supervision Bureau, Wenzhou 325000, Zhejiang, China; 4. Wenzhou Xinda Traffic Engineering Test and Detection Co., Ltd., Wenzhou 325105, Zhejiang, China
- Keywords:
- road engineering; soft ground; single fluid jet grout system; column radius; theoretical analysis
- PACS:
- U416
- DOI:
- -
- Abstract:
- In order to solve the problem that how to reasonably predict jet grout column radius when using single fluid system to reinforce soft ground, by theoretical analysis on the construction of single fluid system, taking the jet grout column with unit length as the research subject, a practical method for predicting jet grout column radius was proposed based on the consideration of the effect of jetting fluid property, jetting energy and resistance of soil to erosion. For the case of fine-grained soils and coarse-grained soils, the results of cone penetration tests qc and the results of standard penetration tests NSPT that frequently used in geotechnical investigation reports were chosen to represent the resistance of soil to erosion. The quantitative relationship among column radius, energy at the nozzle En, and the resistance of soil to erosion (the result of cone penetration test qc and the result of standard penetration test NSPT) was established in this method. Then the variation of column radius with energy at the nozzle En, the result of cone penetration test qc and the result of standard penetration test NSPT were analyzed. The calculation procedure of this method was summarized, and the analysis results of the calculated and measured data in field verified the applicability of this method. The results show that column radius rapidly decreases with the increase of the result of cone penetration test qc and the result of standard penetration test NSPT, namely, the higher the resistance of soil to erosion, the smaller the column radius. The higher the energy at the nozzle En, the larger the column radius. Column radius formed in coarse-grained soils is larger than that formed in fine-grained soils when the jetting parameters are identical.
Last Update: 2017-07-17