首页|Study on damage-stress loss coupling model of rock and prestressed anchor cable in dry-wet environment

Study on damage-stress loss coupling model of rock and prestressed anchor cable in dry-wet environment

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The loss of anchoring force is one of the problems to be solved urgently.The anchorage loss is a key factor causing the failure of anchoring engineering,so it is crucial to study the time-dependent variation of anchoring force.Alternating dry and wet(D-W)conditions have a significant effect on deformation of rock.The anchoring system is composed of anchoring components and rock mass,and thus rock defor-mation has a significant impact on the loss of anchoring force.Quantifying rock deformation under the effects of D-W cycles is a prerequisite to understanding the factors that influence loss of anchoring force in anchor bolts.In this study,we designed an anchoring device that enabled real-time monitoring of the variation in strain during D-W periods and rock testing.Nuclear magnetic resonance(NMR)measure-ments showed that under D-W conditions,the increment in porosity was smaller for prestressed rock than unstressed rock.The trends of prestress loss and strain variation are consistent,which can be divided into three characteristic intervals:rapid attenuation stage,slow attenuation stage and relatively stable stage.At the same stress level,the rate of stress loss and strain for the soaking specimen was the highest,while that of the dried specimen was the lowest.In the same D-W cycling conditions,the greater the prestress,the smaller the strain loss rate of the rock,especially under soaking conditions.The char-acteristics of pore structure and physical mechanical parameters indicated that prestress could effec-tively suppress damage caused by erosion related to D-W cycles.The study reveals the fluctuation behavior of rock strain and prestress loss under D-W conditions,providing a reference for effectively con-trolling anchoring loss and ideas for inventing new anchoring components.

D-W cyclesAnchoring force lossCoupled modelPore structurePrestressed device

Yu Zhao、Huasu Wang、Jing Bi、Zhijun Wu、Chaolin Wang、Jiabao Ma

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College of Civil Engineering,Guizhou University,Guiyang 550025,China

School of Civil Engineering,Wuhan University,Wuhan 430072,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaScience and Technology Support Project of GuizhouScience and Technology Support Project of GuizhouScience and Technology Support Project of GuizhouCultivation Program of Guizhou UniversityTalents of Guizhou UniversitySpecial Research Funds of Guizhou UniversitySpecial Research Funds of Guizhou UniversitySpecial Research Funds of Guizhou University

521640015206400652004072[2020]4Y044[2021]N404[2021]N511[2020]1201901201903202011202012

2023

10.1016/j.ijmst.2023.11.004

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(12)
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