基于外锚头段切向刚度的在役锚索预应力测试方法研究

doi:10.13722/j.cnki.jrme.2021.1265

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Abstract To investigate the prestress state of prestressed anchor cables in service，a new prestress test model was established. This model is based on tangential stiffness theory and considering the structural transfer effect of external anchor segment under working condition，and verified by static and dynamic loading tests. By simplifying the rough contact interface between the anchor and anchor base plate of the external head segment as an anchorage-contact model，and based on Hertz contact theory and GW statistical contact model，this test model transforms the measurement of cable?s prestress into the identification of the tangential contact stiffness of the contact surface，then obtains the quantitative tangential stiffness of the external anchor segment and the calculating formula of anchor cable prestress，from the measured tangential load and displacement. The static and dynamic loading tests indicat that，the average relative error between the experimental and theoretical values of tangential stiffness and prestress is 7.41%，while this error is within 10% by measuring through elastic wave. These results support the correctness of the anchorage-contact model at external anchor head segment，and the feasibility of the tangential stiffness test method. This test method provides a new effective and nondestructive measurement for the prestress of anchor cables in service.

Key words： geotechnical engineering anchor cable prestress test external anchor head segment tangential stiffness

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	CHEN Qiang1
	ZHOU Zhihong2
	ZHU Baolong3

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CHEN Qiang1,ZHOU Zhihong2,ZHU Baolong3. Study on prestress test on in-service anchor cables based on tangential stiffness of external anchor head segment[J]. , 2022, 41(8): 1595-1609.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1265 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I8/1595

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