- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | WANG Zhijia, HE Xu, LI Shengmin, LI Honglei, ZHANG Jianjing, LI Liangyong. Experimental Study on Bearing Capacity of Geosynthetic-Encased Recycled Concrete Aggregate Column[J]. Journal of Southwest Jiaotong University, 2023, 58(1): 244-252. doi: 10.3969/j.issn.0258-2724.20210109
|
Recycled concrete aggregates are used to replace the gravel core material of encased stone columns, forming a new foundation treatment method—recycled concrete aggregate encased column, to improve the problem that the gravel strength cannot be fully exerted when the encased stone column is used to treat liquefied and soft soil foundations. Laboratory model tests were performed to study the effect of encasement length, stiffness, and the ratio of column length to diameter on the bearing characteristics and aggregate fragmentation degree of the encased recycled concrete aggregate column. The results show that when the length of encasement is 1 to 6 times the column diameter, the bearing capacity of the column can be significantly increased by increasing the encasement length. When the length of encasement is less than 1 or more than 6 times the column diameter, the length change of encasement does not significantly influence the bearing capacity of the column. The critical stiffness of encasement is about 100 kN/m. When the stiffness of the encasement is less than the critical stiffness, increasing the encasement stiffness can prominently improve the bearing capacity of the column. However, when the stiffness of the encasement is greater than the critical stiffness value, increasing the encasement stiffness cannot significantly improve the bearing capacity of the column. When the length of the geosynthetic-encased recycled concrete aggregate column is fixed, columns with a length-to-diameter ratio greater than 10 have a lower bearing capacity, and mainly produce local bending to varying degrees within the depth range from 10 cm to 30 cm, while columns with a length-to-diameter ratio less than 7 have a relatively higher bearing capacity and mainly experience slight bulging deformation without local bending. Besides, there is a positive correlation between the fragmentation degree of the recycled concrete aggregate and the ultimate load that the column can withstand. Increasing the encasement length, stiffness and column diameter will increase the fragmentation degree of the core material. Therefore, when designing a single geosynthetic-encased recycled concrete aggregate column, full consideration should be given to the relationship between the encasement length, stiffness, the ratio of column length to diameter, and the fragmentation degree of the concrete aggregate, to obtain the optimal design scheme.
| [1] |
HE Q, SHI S Y, HU M M. Exploring a long-term mechanism of construction and demolition waste recycling: a case of Chongqing[C]//Proceedings of the 17th International Symposium on Advancement of Construction Management and Real Estate. Shenzhen: Springer Berlin Heidelberg, 2013: 109-1120.
|
| [2] |
ALKHORSHID N R, ARAUJO G L S, PALMEIRA E M, et al. Large-scale load capacity tests on a geosynthetic encased column[J]. Geotextiles and Geomembranes, 2019, 47(5): 632-641. doi: 10.1016/j.geotexmem.2019.103458
|
| [3] |
HUGHES J M O, WITHERS N J. Reinforcing of soft cohesive soils with stone columns[J]. Ground Engineering, 1974, 7(3): 42-49.
|
| [4] |
VAN IMPE W F. Soil improvement techniques and their evolution[J]. Animal Science Papers and Reports, 1989, 20(1): 169-178.
|
| [5] |
RAITHEL M, KEMPFERT H G, KIRCHNER A. Geotextile-encased columns (GEC)for foundation of a dike on very soft soils[C]//In: Proceedings of the Seventh International Conference on Geosynthetics. Nice: [s.n.], 2002: 1025-1028.
|
| [6] |
欧阳芳,张建经,付晓,等. 包裹碎石桩承载特性试验研究[J]. 岩土力学,2016,37(7): 1929-1936. doi: 10.16285/j.rsm.2016.07.013
OUYANG Fang, ZHANG Jianjing, FU Xiao, et al. Experimental analysis of bearing behavior of geosynthetic encased stone columns[J]. Rock and Soil Mechanics, 2016, 37(7): 1929-1936. doi: 10.16285/j.rsm.2016.07.013
|
| [7] |
TANDEL Y K, SOLANKI C H, DESAI A K. Field behaviour geotextile reinforced sand column[J]. Geomechanics and Engineering, 2014, 6(2): 195-211. doi: 10.12989/gae.2014.6.2.195
|
| [8] |
MURUGESAN S, RAJAGOPAL K. Geosynthetic-encased stone columns: numerical evaluation[J]. Geotextiles and Geomembranes, 2006, 24(6): 349-358. doi: 10.1016/j.geotexmem.2006.05.001
|
| [9] |
MALARVIZHI S N, ILAMPARUTHI K. Comparative study on the behavior of encased stone column and conventional stone column[J]. Soils and Foundations, 2007, 47(5): 873-885. doi: 10.3208/sandf.47.873
|
| [10] |
NAZARI AFSHAR J, GHAZAVI M. Experimental studies on bearing capacity of geosynthetic reinforced stone columns[J]. Arabian Journal for Science and Engineering, 2014, 39(3): 1559-1571. doi: 10.1007/s13369-013-0709-8
|
| [11] |
MURUGESAN S, RAJAGOPAL K. Studies on the behavior of single and group of geosynthetic encased stone columns[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2010, 136(1): 129-139. doi: 10.1061/(ASCE)GT.1943-5606.0000187
|
| [12] |
浙江省住房与城乡建设厅. 复合地基技术规范: GB/T 50783—2012[S]. 北京: 中国计划出版社, 2012
|
| [13] |
BUCKINGHAM E. On physically similar systems: illustrations of the use of dimensional equations[J]. Physical Review Journals Archive, 1914, 4(4): 345-376. doi: 10.1103/PhysRev.4.345
|
| [14] |
GHAZAVI M, NAZARI AFSHAR J. Bearing capacity of geosynthetic encased stone columns[J]. Geotextiles and Geomembranes, 2013, 38: 26-36. doi: 10.1016/j.geotexmem.2013.04.003
|
| [15] |
ASTM D 4595. Standard test method for tensile properties of geotextiles by the wide-width strip method[S]．West Conshohocken: American Society for Testing and Materials, 2005
|
| [16] |
CASTRO J. Numerical modelling of stone columns beneath a rigid footing[J]. Computers and Geotechnics, 2014, 60: 77-87. doi: 10.1016/j.compgeo.2014.03.016
|
| [17] |
FARAH R E, NALBANTOGLU Z. Behavior of geotextile-encased single stone column in soft soils[J]. Arabian Journal for Science and Engineering, 2020, 45(5): 3877-3890. doi: 10.1007/s13369-019-04299-3
|
| [18] |
赵明华,顾美湘,张玲,等. 竖向土工加筋体对碎石桩承载变形影响的模型试验研究[J]. 岩土工程学报,2014,36(9): 1587-1593. doi: 10.11779/CJGE201409003
ZHAO Minghua, GU Meixiang, ZHANG Ling, et al. Model tests on influence of vertical geosynthetic-encasement on performance of stone columns[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1587-1593. doi: 10.11779/CJGE201409003
|
| [19] |
DEBNATH P, DEY A K. Bearing capacity of geogrid reinforced sand over encased stone columns in soft clay[J]. Geotextiles and Geomembranes, 2017, 45(6): 653-664. doi: 10.1016/j.geotexmem.2017.08.006
|
| [20] |
HATAF N, NABIPOUR N, SADR A. Experimental and numerical study on the bearing capacity of encased stone columns[J]. International Journal of Geo-Engineering, 2020, 11(1): 1-19. doi: 10.1186/s40703-020-0108-4
|
| [21] |
HARDIN, B O. Crushing of soil particles[J]. Journal of Geotechnical Engineering, 1985, 111: 1177-1192. doi: 10.1061/(ASCE)0733-9410(1985)111:10(1177)
|
Figures(12) / Tables(8)
DownLoad:
