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为了分析切方边坡悬臂桩受力特征,运用二维颗粒流方法建立了相应的数值模型,研究了桩间土拱形成的过程及其破坏机制。依据桩后土体的荷载-位移曲线和变形特征,揭示了桩后土拱形成过程的3个阶段以及各阶段土体应力分布和变形的特征。研究结果表明:抗滑桩土拱的形成机制主要依赖于土体微元的荷载传递过程;土拱效应的形成过程受桩土相对位移的控制,且受桩间距的影响较大,而受土体参数的影响较小;抗滑桩土拱效应失效过程的数值模拟显示,土拱失效过程可分为3个阶段,且该过程受贴近桩体的土体的渐进破坏控制。土体强度和桩间距对桩后土体的荷载-位移曲线影响都较为显著。桩距相同时,随着土体强度的提高,桩后土体的极限荷载也越高,但对应的桩土相对位移量却较接近,同时软弱土体土拱效应的失效以“绕流”模式为主,而强度较高土体的土拱效应失效以“滑塌”模式为主;抗滑桩间距越小,桩后土体的峰值土压力越高,所对应的桩土相对位移越大。
In order to analyze the stress characteristics of the cantilever pile, a two-dimensional particle flow method was used to establish the corresponding numerical model and study the soil arching between piles and its failure mechanism. According to the load-displacement curve and deformation characteristics of the post-pile soil, the three stages of the soil arching process and the stress distribution and deformation characteristics of the soil are revealed. The results show that the formation mechanism of soil arching of anti-slide pile mainly depends on the load transfer process of soil micro-element. The formation process of soil arching is controlled by the relative displacement of pile-soil, The results show that the failure process of soil arching can be divided into three stages, and the process is controlled by the gradual failure of the soil close to the pile body. The effect of soil strength and pile spacing on the load-displacement curve of the post-pile soil is significant. When the pile spacing is the same, with the increase of soil strength, the ultimate load of post-pile soil is higher, but the relative displacement of pile-soil is close, meanwhile the failure of soil arching effect of soft soil is “ The soil arching effect of soil with higher strength is dominated by ”slump" mode. The smaller the spacing of anti-slide piles is, the higher the peak earth pressure of soil after piles is. The corresponding pile The greater the relative displacement of soil.