论文部分内容阅读
针对锚拉桩设计中土压力计算模式存在的问题,提出了三维土拱效应模型这种新的计算方法,通过有限元方法,对该模型的正确性进行了验证。在此基础上,讨论了锚头间距、土体粘聚力、内摩擦角及弹性模量对三维土拱效应的影响。结果表明:随着锚头间距增大,土拱效应减小;土体粘聚力和内摩擦角增大,土拱效应增强,但增大到一定值后,荷载分担比例变化较小,且粘聚力值变化对土拱效应的影响比内摩擦角更显著;土体弹性模量增大,荷载分担比例也增大,最大可达到100%,此时结构体系可采用点锚,三维土拱效应存在于整个锚索自由段。为进一步验证模型的正确性,进行了室内模拟试验,试验结果表明,挡板后水平及竖向均存在土拱效应。
Aiming at the existing problems of soil pressure calculation mode in the design of anchorage piles, a new calculation method of three-dimensional soil arching effect model is proposed. The correctness of the model is verified by the finite element method. On this basis, the effects of anchor spacing, soil cohesion, internal friction angle and elastic modulus on three-dimensional soil arching are discussed. The results show that with the increase of anchor head spacing, the soil arching effect decreases. The soil cohesion and internal friction angle increase and the soil arching effect increases. However, when the anchor head spacing increases, the load sharing ratio changes less The change of cohesion value has more significant influence on soil arching effect than the internal friction angle. The elastic modulus of soil increases and the proportion of load sharing also increases up to 100%. At this point, the system can use point anchor, The effect exists throughout the free section of the anchor. In order to further verify the correctness of the model, an indoor simulation test was carried out. The test results show that soil arching exists in the horizontal and vertical baffles.