抗滑桩变形监测及位移确定研究

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Abstract Aiming at the problems in the deep deformation monitoring of anti-slide piles，the Brillouin optical time domain reflectometer(BOTDR) technology is proposed to monitor deep deformation of anti-slide piles. Based on the monitoring data，the displacement is determined. Through the analysis of relationships between displacement and other physical quantities of anti-slide pile and the strain characteristics by BOTDR technology，the quadratic integral function relation between displacement and strain is established；and the analytical process and boundary conditions are given based on the hypotheses. Taking the anti-slide pile project of the landslide No.1 at Hongyan Village of Zhu-Yong Expressway in Zhejiang Province as the background，the optical fiber sensor and inclinometer are installed at different locations and the displacements are calculated based on the monitoring data. Comparing the calculation displacements with inclinometer monitoring results，the rationality of model for determining anti-slide pile displacement based on BOTDR monitoring data is verified. The results show that：BOTDR technology applied to monitor deep deformation of anti-slide pile is feasible；the model for determining anti-slide pile displacement can meet the needs of engineering to some extent；through arranging optical fiber along the reinforcement，the calculation displacements based on the monitoring data are more accurate. Finally，the locations of installing optical fibers for determining displacement of anti-slide pile based on BOTDR technology are recommended. The study has reference value for the application of BOTDR monitoring technology in anti-slide pile and relational monitoring and data processing in pile foundation engineering.

Key words： pile foundations anti-slide pile monitoring Brillouin optical time domain reflectometer(BOTDR) displacement calculation model

Received: 28 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I10/2147

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