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《Journal of Safety and Environment》 2008-04
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On the working performance testing and analysis with the pre-stressed anchor rope in the soil in deep foundation pit

XIONG Zhi-biao1,WANG Qi-yun1,CHEN Zhen-fu1,OUYANG Zhong-yi2,LONG Zuo-ying3(1 Geotechnical Engineering Department,School of Urban Construction,University of South China,Hengyang 421001,Hunan,China;2 Hengyang Construction and Engineering Administer Bureau,Hengyang 421001,Hunan,China;3 Yuban Building Project Limited Liability Company of Hengyang,Hengyang 421001, Hunan,China)  
This paper is inclined to present the results of our study on the working performance investigation and analysis with the pre-stressed anchor rope in the soil in deep foundation pit.As is often the case for some engineering projects,deep-excavated pile combined anchor rope has been used to retain a system protected with a deep foundation pit,as is shown in our case study,the one in Hengyang,Hunan,in which a slope combined steel tube is locally used with a soil-strengthened wall and double-enhanced pile.In addition,the concrete-enhanced wall is also used as a curtain for preventing the ground water encroachment behind the structure.Besides,since the surrounding conditions around the pit are often complicated,it is necessary to check and monitor the pulling load of the rope in the earth.It is for the above reasons,we have carefully scrutinized the horizontal displacement of the top beam in accordance with the technical data and code required.Here,we have also forwarded the design and construction of the retaining structure for the pit,with the results of inspecting and monitoring for anchor rope and horizontal displacement listed in detail.With the results gained at hand,the working performance of the earth-pre-stressed anchor rope has been analyzed in detail with necessary beneficial conclusions gained,which indicate that the failure mode of pre-stressed anchor rope in the earth is actually caused by a shear force and the interface between the grounding and the earth layer,in turn,producing the breach taking place in a way of slow destruction. The interface movement proves to be of 80%-90% of accumulative total displacement of anchorage when the rope is tensioned.Secondary stretch helps to reduce significantly the pre-stressed loss to less than 10%.And,the pre-stressed anchor rope in the earth can also prevent the deformation effectively by monitoring the results.
【Fund】: 湖南省安全生产监督管理局2007年度安全生产科技发展计划项目(07-30);; 湖南省建设厅2007年度科技计划项目(4)
【CateGory Index】: TU753
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