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Volume 41 Issue 1
Feb.  2022
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Article Navigation >  CARSOLOGICA SINICA  > 2022  >  41(1): 59-66
LIU Menghan,FAN Qiuyan,LI Tianyu,et al.Experimental study on the effect of the elliptical karst cave in front of the pile on the stability of the fixed end of the sliding pile[J].Carsologica Sinica,2022,41(01):59-66. doi: 10.11932/karst2021y12
Citation: LIU Menghan,FAN Qiuyan,LI Tianyu,et al.Experimental study on the effect of the elliptical karst cave in front of the pile on the stability of the fixed end of the sliding pile[J].Carsologica Sinica,2022,41(01):59-66. doi: 10.11932/karst2021y12
shu

Experimental study on the effect of the elliptical karst cave in front of the pile on the stability of the fixed end of the sliding pile

doi: 10.11932/karst2021y12
  • 1.

    School of Resources， Environment and Materials， Guangxi University， Nanning， Guangxi 530004， China

  • 2.

    Research Center of Geotechnical and Structural Engineering， Shandong University， Jinan， Shandong 250061， China

  • 3.

    Guangxi Electric Power Design Institute Co. Ltd.， China Energy Engineering Group，Nanning， Guangxi 530007， China

  • 4.

    Guangdong Xiubang Agent Construction Engineering Management Limited， Huizhou，Guangdong 516000， China

Funds:

 41162012

 2010GXNSFA013005

  • Received Date: 2020-09-09
  • Publish Date: 2022-02-25
    Abstract
  • With the vigorous advancement of China's infrastructure construction and increasing attention to the prevention and control of geological disasters， a large number of horizontal load-bearing anti-slide piles have been set up in karst areas. Due to the existence of karst phenomena such as karst caves， the load-bearing properties of such anti-slide piles have their particularity. Studies on these properties are rarely carried out at home and abroad， which leaves many technical problems to be solved urgently in the arrangement of anti-slide piles in karst areas. When there is a karst cave in front of the anti-slide pile， the karst cave may be deformed under horizontal load， causing the embedded end of the anti-slide pile to lose stability. Based on the indoor similar model test and theoretical research， this paper establishes two different shapes of caves （horizontal in the longitudinal direction and vertical in the longitudinal direction） in front of the rock-socketed section of the anti-slide pile. Using horizontal loading tests， the influence of the karst cave in front of the elliptical pile on the stability of the anti-sliding pile with embedded end was examined. Results show that the deformation of the rock-socketed body of the test model with the vertical longitudinal direction of the karst cave can be divided into three stages， elastic deformation， steady crack expansion and accelerated crack expansion. When loaded to the failure limit， the roof of the cave will be uplifted and destroyed， and the fracture section of the finally formed roof will be about 45° from the horizontal. In the test model with the long axis of the cave in front of the pile， when the failure load of the vertical model increases one degree of load， the embedded end remains stable as a whole. Compared with the horizontal and long axis karst caves， the existence of the longitudinal axis karst caves significantly reduces the bearing capacity of the embedded end of the anti-slide pile.In addition，the smaller the thickness of the cave roof is，the greater the impact on the bearing capacity of the anchored end of the anti-slide pile becomes， and the failure form is the collapse of the cave roof under compression.Under the condition that there is a karst cave in front of the pile，the calculation method of the ultimate bearing capacity of the anti-sliding pile in the embedded-solid section of the anti-sliding pile is verified based on the rigid limit equilibrium theory，which can be used as a reference for the design of anti-sliding piles in karst areas.

     

    • LIU Menghan,FAN Qiuyan,LI Tianyu,et al.Experimental study on the effect of the elliptical karst cave in front of the pile on the stability of the fixed end of the sliding pile[J].Carsologica Sinica,2022,41(01):59-66.
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