无缝桥引板微型桩-土共同作用试验研究

Study on micropile under approach slab and soil interaction in jointless bridge

利用MTS加载系统开展砂土中微型桩水平受荷室内足尺模型试验,对微型桩的桩身位移、桩身弯矩和桩周水平土抗力的分布进行研究,同时探讨了微型桩-土p-y曲线的特性.研究表明,桩身位移主要发生在桩顶下10倍桩径的范围,桩身弯矩主要集中在桩顶下15倍桩径的范围;采用双曲线模型拟合比抛物线模型拟合和双曲正切曲线模型拟合的p-y曲线精度更高.

The full scale test of micropile in sand under lateral load is carried out using the hydraulic servo testing system,and the lateral displacement,bending moment of the micropile and the soil-pile reaction at different depths are obtained. The test results show that,the displacement and bending moment of micropile mainly concentrated within the scope where the distance below the top of the pile is about 10 and 15 times diameter of micropile respectively、hyperbolic function of p-y curve is more accurate compared with parabola function and hyperbolic tangent function.