三排微型桩加固碎石土滑坡物理模型试验研究

A study of the physical model test of debris landslide reinforcement with three row micro-piles

通过3组不同桩间距下三排微型桩加固碎石土滑坡室内模型试验,研究微型桩受力变形特性和滑坡推力传递规律。试验结果表明:滑坡推力和桩身弯矩沿桩埋深方向呈自上而下逐渐增大趋势;桩间距为5d时,微型桩群与桩间土体协同作用效果最理想,桩顶位移最小,滑坡推力在排桩间分布最合理,其传递系数α,β分别在(0.54,0.71)和(0.27,0.49)间取值,桩群能承受的滑坡推力最大,抗滑效果越好。

The stress deformation characteristics of micropile and the transmission law of a landslide are studied through three groups of experiments of different piles spacing under three rows of a micropile reinforcement debris landslide. The test results show that the landslide thrust and pile bending moment gradually increases from top to bottom in the direction of the buried depth of the pile. When the spacing between piles is 5 d,the interaction effect between pile and soil is the best,the displacement of the top of the pile is minimum,and the thrust of the landslide is the most reasonable. When the landslide thrust transfer coefficients α and β are in（ 0. 54,0. 71） and（ 0. 27,0. 49）,respectively,the micro pile can withstand landslide thrust the greatest and skid is better.