ZHANG Lei, SHI Bin, ZHANG Dan, HAN Heming, WEI Guangqing. 2019: EVALUATION AND ANALYSIS OF WORKING STATE OF ANTI-SLIDE PILE WITH BOTDR TECHNOLOGY. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1464-1472. DOI: 10.13544/j.cnki.jeg.2018-266
    Citation: ZHANG Lei, SHI Bin, ZHANG Dan, HAN Heming, WEI Guangqing. 2019: EVALUATION AND ANALYSIS OF WORKING STATE OF ANTI-SLIDE PILE WITH BOTDR TECHNOLOGY. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1464-1472. DOI: 10.13544/j.cnki.jeg.2018-266

    EVALUATION AND ANALYSIS OF WORKING STATE OF ANTI-SLIDE PILE WITH BOTDR TECHNOLOGY

    • Considering the problems of traditional sensing technology, this paper conducts the long-term monitoring and analysis of deep deformation of the anti-slide pile of Majiagou landslide with Brillouin Optical Time Domain Reflectometry(BOTDR) technology. The deflection and internal forces of the anti-slide piles are estimated through the monitored strain data and comparison between the estimated and designed internal forces are made. Taking the hydrological factors into consideration, the working state of anti-slide piles is analyzed and evaluated from the internal and external perspectives. It is shown that there are two sliding surfaces in the Majiagou landslide at the depth of 19 m and 27 m, respectively. Before March 2015, the overall deformation of Majiagou landslide is small, signifying it is in a relative stable state. Then the piles gradually exerts its anti-sliding function. In addition, the shear force of the anti-slide pile is close to the designed value for the present. That is, the anti-slide pile is in an unstable state and needs to be strengthened. The deformation of the anti-slide pile is mainly controlled by the reservoir water level, while the precipitation has a minor effect. Seasonally, the anti-slide pile has an obvious pattern with large deformation when the reservoir water level decreases. Then there is a rapid transition to constant deformation as the reservoir level rises. BOTDR monitoring technology provides a very advanced monitoring means for long-term and meticulous evaluation of the stability state of anti-slide piles.
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