嵌岩桩抗滑特性的物理模型试验研究

发布时间：2018-09-07 08:36

【摘要】：进行嵌岩桩与滑坡体相互作用的框架式滑坡物理模型试验,根据微型土压力盒和电阻应变计的监测数据,分别研究滑坡推力作用下模型桩的受力特征、桩身弯矩分布规律及模型变形破坏模式。试验结果表明,嵌岩桩加固后的滑坡,桩后推力随深度的增加呈抛物线型分布形式,合力作用点约在滑动面以上模型桩自由段的1/2处;嵌岩模型桩有明显的抗滑特性,承担了大部分桩后推力,传递至桩前土压力值较小且稳定;模型桩的桩身弯矩分布形式不同于普通抗滑桩弯矩分布形式,自由段埋深0~15 cm范围内为主要弯矩承受区域,最大弯矩截面位于滑面上模型桩自由段1/3处,滑动面处桩身弯矩绝对值较小;滑坡模型在沿滑面推力加载作用下发生桩后滑体越桩滑动破坏。该试验成果为嵌岩桩的抗滑特性研究提供了科学依据,可为该类型抗滑桩设计提供一定的指导性建议。
[Abstract]:Based on the monitoring data of the micro earth pressure box and the resistance strain gauge, the mechanical characteristics of the model pile under the action of the landslide thrust are studied by the physical model test of the interaction between the rock-socketed pile and the landslide body, according to the monitoring data of the micro-earth pressure box and the resistance strain gauge. Distribution law of pile bending moment and model deformation and failure mode. The test results show that the thrust of the rock socketed pile is parabola distribution with the increase of depth, and the joint force is about 1 / 2 of the free section of the model pile above the sliding surface, and the rock-socketed pile has obvious anti-slide property. The model pile is different from the ordinary anti-slide pile in the distribution form of bending moment, and the main bending moment bearing area is within 0 ~ 15 cm of the buried depth of the free section, and the distribution of the bending moment of the model pile is different from that of the ordinary anti-slide pile, and the distribution of the bending moment of the model pile is different from that of the common anti-slide pile. The maximum bending moment section is located at 1 / 3 of the free section of the model pile on the sliding surface, and the absolute value of the bending moment of the pile body at the sliding surface is smaller, while the sliding failure of the landslide model occurs under the action of thrust loading along the sliding surface. The experimental results provide a scientific basis for the study of the anti-slide characteristics of rock-socketed piles and provide some guiding suggestions for the design of this type of anti-slide piles.
【作者单位】：中国地质大学(武汉)工程学院;
【基金】：国家重点基础研究发展计划“973”项目资助(No.2011CB710600) 国家自然科学基金资助(No.41272305)
【分类号】：TU473.1

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