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Long-term Hardening Characteristics of prestressed anchorage Grout

Journal of Mountain Science 2012年第6期9卷 752-759页

作者： WANG Sheng CHEN Liyi HUANG Runqiu JIANG Zhaoqun WANG Yanshu State Key Laboratory of Geohazard Prevention&Geoenvionment Protection Chengdu University of TechnologyChengdu 610059China The Insititute of Exploration Technology of CAGS Chengdu 611734China

Grout plays an important role in the transmission and maintenance of anchoring force,and in the protection of anchorage materials against ***,the hardening characteristics of grout directly affect the anchoring effectivity and long-term *** have excavated a prestressed anchorage which has been in service for 20 years,and have tested the grout which has worked for that long period under complicated geological conditions through strength tests and have analyzed its mineral composition using scanning electron microscopy(SEM) and X-ray diffraction(XRD).The results show that the mineral composition of the 12.5 m segment differs from other segments,and corresponds with poor coagulation characteristics of the 12.5 m segment *** shows that unhydrated tricalcium silicate may be the reason for the localized poor coagulation.

关键词： prestressed anchorage Grout Longterm hardening characteristics Scanning electron microscopy(SEM) X-ray diffraction(XRD)

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Model test of the stability degradation of a prestressed anchored rock slope system in a corrosive environment

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Journal of Mountain Science 2020年第10期17卷 2548-2561页

作者： LI Cong ZHANG Rong-tang ZHU Jie-bing LIU Zhi-jun LU Bo WANG Bin JIANG Yu-zhou LIU Jie-sheng ZENG Ping School of Civil Engineering and Architecture Wuhan Polytechnic UniversityWuhan430023China Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources Changjiang River Scientific Research InstituteWuhan430010China Guangzhou Baiyun International Airport Co. Ltd.Guangzhou510406China

The long-term stability of a prestressed anchored slope might be influenced by the durability of the anchorage *** understand long-term stability of anchored rock slopes,the research presented herein evaluated the performance evolution of a prestressed anchored bedding slope system in a corrosive environment by model *** corrosion process in a prestressed anchor bar was monitored in terms of its open-circuit potential(OCP),corrosion current density(CCD),and electrochemical impedance spectroscopy(EIS).The stability of the prestressed anchored slope was evaluated by monitoring changes in anchorage force and *** experimental results show that prestress and oxygen could reduce the corrosion resistance of the anchor bar,and anchor bars in a chloride-rich environment are very susceptible to *** tendons in a corrosive environment suffer a loss of anchorage force,the prestress decreases rapidly after locking,and the rate thereof decreases until stabilising;in the later stage,corrosion leads to the reduction of the cross-sectional area of the steel bar which may cause the reduction in anchorage force *** force controls the deformation and stability of the anchored slope,the prestress loss caused by later corrosion may lead to an increased rate of displacement and stability degradation of the prestressed anchored rock slope.

关键词： Model test Bedding slope prestressed anchorage Corrosion Electrochemical measurement

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