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在开挖、降雨或地震等外部因素作用下,边坡土体很容易进入局部或瞬态大变形乃至失稳滑动,使抗滑桩产生附加位移及弯矩。基于两阶段分析方法,采用Winkler模型模拟抗滑单桩与土之间的相互作用,建立单桩水平位移控制方程组,根据内力与位移的连续条件得到考虑不同土体侧移模式下求解桩身响应的矩阵解析表达式,并采用现场监测数据及Poulos弹性理论进行验证,证明该方法是合理可行的,并通过参数分析土体侧移对抗滑桩水平承载性状的影响程度。分析结果表明,土体侧移模式包括最大侧移值、分布形状及重心、侧移势等,对抗滑桩的挠度和弯矩均有显著影响,在工程设计中应予以充分重视。
Under the action of external factors such as excavation, rainfall or earthquakes, the slope soil can easily enter the local or transient large deformation or even the instability sliding, so that the anti-slide pile generates additional displacement and bending moment. Based on the two-stage analysis method, the Winkler model is used to simulate the interaction between anti-slide single pile and soil, and the governing equations of horizontal displacement of single pile are established. According to the continuous condition of internal force and displacement, The matrix analytic expressions of the response of the pile are obtained and verified by on-site monitoring data and Poulos elasticity theory. The results show that the method is reasonable and feasible, and the degree of influence of lateral displacement of the soil on the horizontal bearing behavior of the anti-slide pile is analyzed. The analysis results show that the lateral displacement modes of soil include the maximum lateral displacement, distribution shape, center of gravity and lateral displacement, which have a significant influence on the deflection and bending moment of anti-slide piles. Therefore, sufficient attention should be paid in engineering design.