运用钻孔测斜仪监测滑坡抗滑桩变形受力状态研究

STUDY ON MONITORING OF DEFORMATION AND STREE STATE OF LANDSLIDE ANTI-SLIDE PILES USING BOREHOLE INCLINOMETER

通过在大截面钢筋混凝土和钢轨抗滑桩身埋设钻孔测斜管,监测得二类抗滑桩的水平侧向位移。对于大截面钢筋混凝土抗滑桩,视为埋于土内的弹性地基梁,求得其弹性曲线微分方程,进而得出桩身转角、弯矩、剪力、桩前抗力等;对于钢轨抗滑桩,把测斜仪所测横向变形当作钢轨桩的弯曲变形,然后再反算出钢轨桩的弯矩、正应力和抗滑力。最后,将该方法应用于某高速公路韩家垭、0509工点滑坡的抗滑桩变形受力监测,效果良好。

The horizontal lateral displacement of reinforced concrete or rail anti-slide piles is measured by setting up borehole incline-tube in pile. For reinforced concrete anti-slide piles, it is considered as beams on elastic foundation so as to obtain elastic curve differential equation, and the rotating-angle, bending moment, shear and resistance of soil or rock piles are deduced then. For rail anti-slide piles, the bending moment, normal stress and anti-slide force of rail anti-slide pile are calculated inversely based on flexure deformation measured by inclinometer. Finally, this method is applied to Hanjiaya and 0509 landslide with satisfying effects.