h型抗滑桩受力性能模型试验研究

Model Tests on Mechanical Behavior of h-Type Anti-Slide Pile

针对h型抗滑桩在坡顶荷载作用下的受力特征,通过室内模型试验,分析h型抗滑桩的前桩与后桩的受力机理、桩身弯矩和桩前土压力分布特性。结果表明:在坡顶均布荷载作用下,后排桩的桩身弯矩随桩体埋深的增大呈先增大后减小的抛物线分布,弯矩峰值出现在预设滑面附近;前排桩的桩身弯矩随桩体埋深的增大而增大,弯矩峰值出现在桩顶连梁连接处;后排桩桩前土压力分布随着坡顶荷载的增大而增大,而上部两个测点相对变化幅度较小;在连梁以下部位,前排桩桩前土压力分布趋势与后排桩变化趋势基本一致,而连梁位置处偏小。

Aiming at the stress characteristics of h-type anti-slide piles under the load of the top of the slope,the mechanism of the front pile and the rear pile,the bending moment of the pile shaft and the distribution of the soil pressure in front of the pile are analyzed through scale model test in laboratory.The results show that under the load of the top of the slope,the bending moment of the pile shaft of the rear row pile is increased first and then decreased with the increase of the pile burial depth,and the peak moment appears near the preset slip surface.The bending moment of the front pile is increased with the depth of the pile,and the maximum value appears at the joint of the pile top and beam.The distribution of earth pressure in front of the rear pile is increased with the increase of the load at the top of the slope,while the relative change range of the two measuring points in the upper part is small.In the position below the link beam,the trend of earth pressure distribution in front of the front pile is basically the same as that of the rear pile,while the position of the link beam is small.