微型桩组合结构抗滑机理模型试验研究

发布时间：2018-10-21 10:42

【摘要】：针对框架梁连接的微型桩组合结构,采用模型试验与有限元分析相结合的方法,对微型桩桩后土压力和桩身水平位移进行测试和分析,研究微型桩组合结构抗滑机理。结果表明:采用框架梁连接的微型桩组合结构,其抗滑机理除了表现在微型桩组合结构增强了滑带的抗剪能力外,各排微型桩还承受较大的弯矩和土体抗力作用;依据模型试验结果,将碎石土受到的土压力采用矩形分布时,运用桩—土相互作用的有限元分析方法计算桩身弯矩和桩身水平位移是合适的,各排微型桩桩身水平位移的理论分析结果与实测结果较为吻合;在模型试验条件下,施加35.49kPa的滑坡推力时作用在第1—第3排桩上的剩余滑坡推力分别达到2.46,2.11和1.01kN·m-1,剩余滑坡推力比为2.44∶2.09∶1。
[Abstract]:Based on the combination of model test and finite element analysis, the soil pressure and horizontal displacement of micro-pile are tested and analyzed, and the anti-sliding mechanism of micro-pile composite structure is studied. The results show that the anti-sliding mechanism of micro-pile composite structure connected with frame beam is that the micro-pile composite structure increases the shear capacity of sliding zone, and each row of micro-pile is subjected to larger bending moment and soil resistance. According to the model test results, when the earth pressure of gravel soil is distributed by rectangle, it is appropriate to calculate the bending moment and horizontal displacement of pile body by using the finite element analysis method of pile-soil interaction. The theoretical analysis results of the horizontal displacement of each row of miniature pile body are in good agreement with the measured results, and under the condition of model test, The residual landslide thrust acting on the first and third row piles with 35.49kPa is 2.462.11 and 1.01kN m-1, respectively, and the residual landslide thrust ratio is 2.44: 2.09: 1.
【作者单位】：四川理工学院建筑工程学院;西南交通大学岩土工程系;杭州萧山城投集团;
【基金】：国家自然科学基金资助项目(51278430) 四川理工学院人才引进资助项目(2013RC11)
【分类号】：TU473.1

【参考文献】