›› 2014, Vol. 35 ›› Issue (S1): 347-352.

• Geotechnical Engineering • Previous Articles     Next Articles

Monitoring and analysis of variation of anchor prestress in saturated silty sand condition

LIU Bo1，ZHANG Gong1，ZHOU Hao-liang2，LI Dong-yang1，LOU Xue-qian1，HUANG Mian1，WANG Xue-qing1   

  1. 1. School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 2. Beijing Modern Jingyu Construction Co., Ltd., Beijing 100102, China
  • Received:2013-09-24 Online:2014-06-10 Published:2014-06-20

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Abstract: Prestress loss of anchor cable should not be neglected in engineering construction. The cause of prestress loss is usually related to engineering site condition. The saturated silty sand is more complicated and sensitive than other geological conditions, which is more likely to cause prestress loss. Through real-time monitoring of anchor prestress of a deep foundation pit in Langfang city, combining with the engineering environment, factors influencing on variation of anchor prestress are analyzed. The results show that the process of construction, tension and environmental factors affect the variation of prestress. The most obvious impact is the excavation process; and the maximum rate of variation of prestress value is 79.1%; instantaneous unloading causes values of prestress loss between 22.8% to 59.2%. The influence of construction process is most obvious. Experience for similar geological engineering construction is provided through the research and analysis of variation law of anchor prestress.

Key words: anchor cable, prestress loss, deep foundation pit, tension

CLC Number: 

  • TU 443
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