边坡–锚固结构受力特性与预应力损失研究

doi:10.13722/j.cnki.jrme.2021.0649

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Abstract Prestressed anchor cable is the most common support method in slope reinforcement，and revealing its prestressing time-history change law is of great significance to the long-term stability study of reinforced slopes. Firstly，based on the shear lag model，the force characteristics and load transfer mechanism of the prestressed anchor cable anchoring structure's three elements(anchor bars，mortar and surrounding rock) are studied ，and the calculation formulas for the shear stress at the interface of the anchoring structure and the axial stress distribution of the anchor bars are obtained. Furthermore，according to whether the shear stress at the anchor bar-mortar interface exceeds the bond strength of the two contact interfaces，a prestress coupling model and a prestress decoupling model are proposed；among them，the prestress decoupling model is established based on the shear lag model，which can calculate the final stable value of the anchor cable prestress. Finally，taking Maya High Slope Anchorage Project of the Shuibuya Hydropower as an example，the time-history variation law of the prestress is explored and the prediction formula is put forward. The research results show that the shear stress distribution and the axial stress distribution are characterized by negative exponential attenuation；The fitting result of actual monitoring data proves the rationality of the prediction formula；The maximum error between the calculated stationary value and the actual pre-stress stationary value is only 2.17%，which verifies the accuracy of the prestress decoupling model.

Key words： slope engineering shear lag model load transfer anchor structure stress prestress loss

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	Articles by authors
	SONG Minggang1
	XIANG Xin2
	ZHANG Guangcheng1
	YANG Xinzhi1
	WEN Lian1

Cite this article:

SONG Minggang1,XIANG Xin2,ZHANG Guangcheng1, et al. Study on the mechanical characteristics and prestress loss of slope-anchored structure[J]. , 2022, 41(S1): 2791-2800.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0649 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2791

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