Experimental study on load transfer characteristics of fully bonded anchors in granite residual soil layer

FU Wenguang; QIANG Xiaojun; LANG Xiangwei; XIAO Liping

doi:10.11779/CJGE20230860

Volume 46 Issue 12

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Chinese Journal of Geotechnical Engineering > 2024 > 46(12): 2548-2558. > DOI: 10.11779/CJGE20230860

FU Wenguang, QIANG Xiaojun, LANG Xiangwei, XIAO Liping. Experimental study on load transfer characteristics of fully bonded anchors in granite residual soil layer[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2548-2558. DOI: 10.11779/CJGE20230860

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Experimental study on load transfer characteristics of fully bonded anchors in granite residual soil layer

FU Wenguang^{1, 2, 3,},
QIANG Xiaojun⁴,
LANG Xiangwei⁴,
XIAO Liping^{2, 3, 5}

1.
School of Civil Engineering, Tianjin University, Tianjin 300350, China
2.
Shenzhen Geological Environment Research Institute Co., Ltd., Shenzhen 518063, China
3.
Guangdong Engineering and Technology Research Center for Geotechnique and Underground Space, Shenzhen, 518063, China
4.
Railway Science (Shenzhen) Research and Design Institute Co. LTD, 518063, China
5.
Shenzhen GongKan Geotechnical Group Co., LTD, Shenzhen 518063, China

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Received Date: September 05, 2023
Available Online: March 24, 2024

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Abstract

Abstract

There are abundant research results on the load transfer characteristics of the grout/ground interface of the ground anchors in the industry, but the problems in the cohesive soil layer are still confused such as interface bond stress concentration, stress peak transfer, critical fixed length and anchoring efficiency, etc. For these purpose, according to the normal construction level, 23 full-length fully bonded anchors are constructed in the granite residual clay within the Shenping Anchor tests, and some anchors are embedded with distributed optical fiber. The results of load tests with new type jack and distributed optical fiber tests show that: (1) The ultimate pullout resistance of fully bonded anchor increases approximately linearly with the length in the whole 18 m fixed length, and the anchoring efficiency gradually decreases over 18 m. (2) The bond stress of the front part of anchor will be transferred to the latter part before the bond strength is reached. The stress will be transferred to the anchor end for a short length and then increase to the bond strength in the nearly whole length, while for a long length, the stress of the front part reaches the bond strength first, then passes back to the end, the latter part approaches or almost reaches the bond strength lastly. (3) The axial distribution curve of grout tensile stress can be divided into four sections such as rapid increase, deceleration increase, slow decrease and return to zero. (4) The composite stiffness of anchor body is mainly reflected on the stiffness of tendon, and the composite modulus of fixed length should not be calculated according to the elastic modulus of grout body.
- Shenping anchor test,
- distributed optical fiber,
- grout/ground interface,
- critical fixed length,
- stress concentration

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References

[1]	岩土锚杆与喷射混凝土支护工程技术规范: GB 50086—2015[S]. 北京: 中国计划出版社, 2015. Technical Code for Engineering of Ground Anchoring and Shotcrete Support: GB 50086—2015[S]. Beijing: China Planning Press, 2015. (in Chinese)
[2]	付文光. 浅议预应力锚杆结构的构成与划分[J]. 地震工程学报, 2015, 37(增刊2): 201-206. FU Wenguang. On the composition and division of prestressed anchor structure[J]. China Earthquake Engineering Journal, 2015, 37(S2): 201-206. (in Chinese)
[3]	李强, 付文光, 李波. 拉力型黏性土层锚杆抗拔力现场试验[J]. 现代隧道技术, 2020, 57(5): 210-217. LI Qiang, FU Wenguang, LI Bo. Field test of pull-out resistance of the tension anchor in cohesive soils[J]. Modern Tunnelling Technology, 2020, 57(5): 210-217. (in Chinese)
[4]	基桩分布式光纤测试规程: T/CECS 622—2019[S]. 北京: 中国建筑工业出版社, 2019. Technical Specification for Pile Distributed Fiber Optic Testing: T/CECS 622—2019[S]. Beijing: China Architecture & Building Press, 2019. (in Chinese)
[5]	锚杆试验技术标准: SJG 132—2023[S]. 北京: 中国建筑工业出版社, 2023. Standard for Testing of Ground Anchor: SJG 132—2023[S]. Beijing: China Architecture & Building Press, 2023. (in Chinese)
[6]	隋海波, 施斌, 张丹, 等. 基于BOTDR的锚杆拉拔试验研究[J]. 岩土工程学报, 2008, 30(5): 755-759. doi: 10.3321/j.issn:1000-4548.2008.05.022 SUI Haibo, SHI Bin, ZHANG Dan, et al. BOTDR-based pull-out tests on anchor bolts[J]. Chinese Journal of Geotechnical Engineering, 2008, 30(5): 755-759. (in Chinese) doi: 10.3321/j.issn:1000-4548.2008.05.022
[7]	混凝土结构设计规范: GB 50010—2010[S]. 北京: 中国建筑工业出版社, 2010. Code for Design of Concrete Structures: GB50010—2010[S]. Beijing: China Architecture & Building Press, 2010. (in Chinese)
[8]	汉纳. 锚固技术在岩土工程中的应用[M]. 北京: 中国建筑工业出版社, 1987. HANNA T H. Foundations in Tension --Ground Anchors[M]. Beijing: China Architecture & Building Press, 1987. (in Chinese)
[9]	MÜLLER H. Erfahrungen mit Verankerungen System BBRV in Fels und Lockergesteinen[J]. Schweizerische Bauzeitung, 1966, 84(4): 77-82.
[10]	OSTERMAYER H, SCHEELE F. Research on ground anchors in non-cohesive soils[C]// Speciality Session No. 4, 9th International Conference on Soil Mechanics and Foundation Engineering, Tokyo, 1977.
[11]	HANNA T H. The mechanics of load mobilization in friction piles[J]. Journal of Materials, 1969, 4(4): 924-937.
[12]	BARLEY A D. Theory and practice of the single bore multiple anchor system[C]// International Symposium on "Anchors in Theory and Practice", Salzburg, 1995.
[13]	BARLEY A D. The single bore multiple anchor system[M]// Ground Anchorages and Anchored Structures. London: Thomas Telford, 1997.
[14]	OSTERMAYER H. Construction, carrying behaviour and creep characteristics of ground anchors[C]// Proceedings, Diaphragm Walls and Anchorages Conference, London, 1974: 141-152.
[15]	COATES D F, YU Y S. Three dimensional stress distribution around a cylindrical hole and anchor[C]// Proceedings, 2nd International Conference on Rock Mechanics, Belgrade, 1970: 175-182.
[16]	FUJITA K, UEDA K, KUSABUKA M. A method to predict the load-displacement relationship of ground anchors[J]. Revue Française De Géotechnique, 1978(3): 58-62.