Field test on soil arching in pile-supported reinforced embankment(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年04期
- Page:
- 41-47
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Field test on soil arching in pile-supported reinforced embankment
- Author(s):
- CHEN Geng; CHEN Yong-hui; XU Kai; QI Chang-guang; CAI Rui
- (1.Key Laboratory of Geotechnics and Embankment Engineering of Ministry of Education, Hohai University, Nanjing 210098, Jiangsu, China; 2. Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, Jiangsu, China; 3. Nanjing Hydraulic Research Institute, Nanjing 210029, Jiangsu, China; 4. Cities and Towns Construction Co. Ltd., Nantong Coastal Development Group, Nantong 226006, Jiangsu, China)
- Keywords:
- road engineering; pile-supported embankment; soil arching effect; field test; height of equal settlement plane; pile-soil stress ratio
- PACS:
- U416.1
- DOI:
- -
- Abstract:
- In order to research the vertical stress distribution in filling and critical height of soil arch effect, the stress of pile cap, soil between piles and fill at different height were monitored and recorded, on the basis of field test on plastic tube cast-in-place concrete pile (TC pile)-supported embankment, the load transfer during the periods of embankment filling and preloading was analyzed. Meanwhile, vertical stress distribution in filling and critical height of soil arch effect was studied, assumptions about the soil arch was compared with the test results. Based on the experimental results, parameters of embankment soil arch were also discussed. The results show that the pile-soil stress ratio is more than 1 and the measured values of earth pressures on pile cap is bigger than the embankment load when the filling height of embankment approaches to 0.5 times of pile spacing, which indicates that embankment load begins to transfer from soils to piles and soil arching is initially formed. When height of the embankment is close to 0.9 times of pile spacing, the corresponding earth pressures in soils change little, which reveals that the complete and stable soil arching has been produced, the change range of soil arching root be carried as the reason. The measured height of equal settlement plane is between the calculated values of EBGEO and BS 8006. The monitoring of earth pressures in embankment demonstrates that soil arching is in a shape of semicircular. However, the measured values of earth pressures on pile cap and cushion are 50% and 30% of the calculated results from semicircular soil arching theory. Pile-soil stress ratio with the value of earth pressure on pile is suggested to judge the formation of soil arch in pile-supported reinforced embankment.
Last Update: 2016-07-28