Field tests on bearing capacities of CFG pile and root pile

WANG Nian-xiang; ZHOU Chun-er; WU Jia-wu; REN Guo-feng

doi:10.11779/CJGE2022S2042

Volume 44 Issue S2

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Chinese Journal of Geotechnical Engineering > 2022 > 44(S2): 194-197. > DOI: 10.11779/CJGE2022S2042

WANG Nian-xiang, ZHOU Chun-er, WU Jia-wu, REN Guo-feng. Field tests on bearing capacities of CFG pile and root pile[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(S2): 194-197. DOI: 10.11779/CJGE2022S2042

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Field tests on bearing capacities of CFG pile and root pile

1.
Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China
2.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, China
3.
Guangdong Province Planning and Design Institute for Water Transpotation Co. LTD, Guangzhou 510050, China

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Received Date: December 07, 2022
Available Online: March 26, 2023

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Abstract

Abstract

For the soft soil foundation slipped in the storage yard of a wharf, the composite foundations with CFG pile and root pile net are used for reinforcement in different zones. The field static load tests are carried out to study the bearing behavior of the CFG pile and root pile. The test results of their vertical ultimate bearing capacities of single pile are compared. The bearing deformation difference between the CFG pile and the root pile is analyzed. The results show that there are obvious inflection points in the Q-s curves of the static load tests on the CFG pile and root pile. The values of the vertical ultimate bearing capacity of the root pile are larger than those of the CFG pile. The stiffness of single pile of the root pile is significantly larger than that of the CFG pile under the ultimate bearing capacity, and its maximum settlement at pile top is obviously smaller than that of the CFG pile under the maximum loads.
- CFG pile,
- root pile,
- bearing behavior,
- deformation difference,
- field static load test

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[1]	刘汉龙, 赵明华. 地基处理研究进展[J]. 土木工程学报, 2016, 49(1): 96–115. https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC201601013.htm LIU Han-long, ZHAO Ming-hua. Review of ground improvement technical and its application in China[J]. China Civil Engineering Journal, 2016, 49(1): 96–115. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-TMGC201601013.htm
[2]	何宁, 娄炎, 娄斌. CFG桩复合地基加固桥头深厚软基[J]. 水利水运工程学报, 2010(4): 89–94. https://www.cnki.com.cn/Article/CJFDTOTAL-SLSY201004018.htm HE Ning, LOU Yan, LOU Bin. Improvement of deep and thick soft foundation at the end of a bridge by using CFG pile composite foundation[J]. Hydro-Science and Engineering, 2010(4): 89–94. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SLSY201004018.htm
[3]	李继才, 郦能惠, 丛建, 等. 大型储罐CFG桩复合地基变形性状和变刚度调平设计[J]. 岩土工程学报, 2018, 40(6): 1111–1116. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201806020.htm LI Ji-cai, LI Neng-hui, CONG Jian, et al. Deformation behaviors and variable rigidity design with equilibrium settlement for CFG pile composite foundation of large storage tanks[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(6): 1111–1116. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201806020.htm
[4]	孙少锐, 吴继敏, 魏继红, 等. 树根桩加固边坡的稳定性分析与评价[J]. 岩土力学, 2003, 24(5): 776–780. doi: 10.3969/j.issn.1000-7598.2003.05.022 SUN Shao-rui, WU Ji-min, WEI Ji-hong, et al. Stability analysis and evaluation of slope reinforced with root piles[J]. Rock and Soil Mechanics, 2003, 24(5): 776–780. (in Chinese) doi: 10.3969/j.issn.1000-7598.2003.05.022
[5]	王辉, 陈剑平, 阙金声. 树根桩在基础加固中的设计与应用研究[J]. 岩土力学, 2006, 27(增刊2): 1290–1294. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2006S2117.htm WANG Hui, CHEN Jian-ping, QUE Jin-sheng. Research on design and application of root piles to Strengthening foundations[J]. Rock and Soil Mechanics, 2006, 27(S2): 1290–1294. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2006S2117.htm
[6]	邱发波, 刘志强, 严松宏. 树根桩加固隧道软基的数值分析[J]. 武汉理工大学学报(交通科学与工程版), 2010, 34(2): 270–272. https://www.cnki.com.cn/Article/CJFDTOTAL-JTKJ201002016.htm QIU Fa-bo, LIU Zhi-qiang, YAN Song-hong. Numerical analysis of root pile in reinforcement tunnel basis[J]. Journal of Wuhan University of Technology (Transportation Science & Engineering), 2010, 34(2): 270–272. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-JTKJ201002016.htm
[7]	左宏亮, 金宁政, 许成云. 黏性土地区螺杆灌注桩竖向承载力静载试验[J]. 沈阳建筑大学学报(自然科学版), 2016, 32(2): 225–231. https://www.cnki.com.cn/Article/CJFDTOTAL-SYJZ201602005.htm ZUO Hong-liang, JIN Ning-zheng, XU Cheng-yun. Experiment on vertical bearing capacity of screw grout pile in cohesive area[J]. Journal of Shenyang Jianzhu University (Natural Science), 2016, 32(2): 225–231. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-SYJZ201602005.htm
[8]	马天忠, 朱彦鹏, 任永忠, 等. 黄土地区长短组合桩的承载力及变形特性试验研究[J]. 岩土工程学报, 2018, 40(增刊1): 259–265, 92. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2018S1043.htm MA Tian-zhong, ZHU Yan-peng, REN Yong-zhong, et al. Bearing capacity and displacement characteristics of long-short composite piles in loess areas[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(S1): 259–265, 92. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2018S1043.htm
[9]	郅彬, 李戈, 王永鑫, 等. CFG桩复合地基承载性状试验研究[J]. 建筑结构, 2017, 47(23): 100–102, 71. https://www.cnki.com.cn/Article/CJFDTOTAL-JCJG201723020.htm ZHI Bin, LI Ge, WANG Yong-xin, et al. Experimental research on load-bearing property of CFG pile composite foundation[J]. Building Structure, 2017, 47(23): 100–102, 71. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-JCJG201723020.htm
[10]	复合地基技术规范: GB/T 50783—2012[S]. 北京: 中国计划出版社, 2012. Technical Code for Composite Foundation: GB/T 50783—2012[S]. Beijing: China Planning Press, 2012. (in Chinese)
[11]	建筑基桩检测技术规范: JGJ 106—2014[S]. 北京: 中国建筑工业出版社, 2014. Technical Code for Testing of Building Foundation Piles: JGJ 106—2014[S]. Beijing: China Architecture & Building Press, 2014. (in Chinese)

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