Coupling analysis between prestress loss of anchor cables and creep of rocks
YANG Wendong1, LIU Chuntian1, ZHANG Xiang1, CHEN Xiaopeng2, JING Wenjun1, ZHANG Lianzhen1, WANG Bingqi1, QIN Hao3
1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, Shandong, China; 2. POWERCHINA Chengdu Engineering Corporation Limited, Chengdu 610072, Sichuan, China; 3. Institute of Defense Engineering, AMS, PLA, Beijing 100850, China
Abstract: Based on rheological mechanics and viscoelastic mechanics, a theoretical model for the coupling of prestress loss of anchor and creep of rock was established. Considering the influence of prestress loss when the prestressed anchor was used to reinforce rock mass, the creep equations of stable creep rock and unstable creep rock were derived, and the formula for calculating prestress of anchor with time was obtained. The results showed that the anchor prestress loss was faster in the period of completion of anchor tension; then the rate of prestress loss was gradually reduced and finally stabilized, and the creep of rock also became stable. By comparing the calculated results with the experimental results in existing literature, the curves of the two were consistent, which verified the correctness of the model. The comparison between the variation of anchor cable prestress at Jinping Hydropower Station and the calculation results of the theoretical model proves the accuracy of this research model applied to engineering examples. The theoretical analysis results established in this paper considering the coupling of anchor cable prestress loss and rock mass creep have a wider application range than previous coupling models, which is not only applicable to stable creep rock, but also to unstable creep rock. The warning of abnormal changes in anchor cable anchoring force and the long-term safe operation of slope engineering have extensive engineering application value.
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2023, Vol. 5 
