沉埋桩加固滑坡体模型试验的机制分析

为研究沉埋桩加固滑坡体的作用机制,采用土压力盒和壁面式压力盒等多种测试手段,完成一系列室内大型模型试验.在外界施加的滑坡推力作用下,测试桩后推力和桩前抗力,分析桩后和桩顶坡体受力状态的变化.根据监测数据的动态变化,判断坡体出现滑裂面的时间和滑裂面的位置,并分析桩抗滑段长度变化时滑坡体的破坏形式与变化规律,同时计算桩顶以上坡体承担的滑坡推力;判断桩身截面的物理状态,计算坡体出现滑裂面时桩身所受的滑坡推力,分析沉埋桩加固滑坡体的机制、桩长变化桩身所受的滑坡推力及其分布规律与桩顶滑体所承担推力之间的关系,为沉埋桩设计提供科学依据.

MECHANISM ANALYSIS OF SLOPE REINFORCEMENT WITH DEEPLY BURIED PILES WITH MODEL TEST

To study the mechanism of deeply buried piles stabilizing the slope,a series of large-scale model tests are carried out.Several testing tools including rigid load cells are employed to measure the anti-sliding forces initiated by the piles and the sliding force exerted by the piles,especially the earth pressure cells are used to measure the variation of stress condition at the rear of the back of piles and upward to the top of piles as the sliding force impelled by the system of force output.On the basis of the variation process of measured data,the time and the location of slide surface in the slope are identified;and the maximal anti-sliding forces upward to the top of piles are calculated.Then,the failure modes and transformation were analyzed as the anti-sliding length of the piles changed.Physical conditions of the pile cross-section are determined;and the sliding force subjected to the piles was estimated.The mechanism of deeply buried piles for the slope reinforcement and the relationship between the sliding forces subjected to the piles and that supplied by the slope upward to the top of piles are analyzed to supply scientific basis for the design method of the deeply buried piles.