软硬交互地层中DX桩荷载传递特性模型试验研究

发布时间：2018-08-21 13:15

【摘要】：通过室内不同土层中DX模型桩加载试验,对DX桩在软硬交互土层中荷载传递规律及承载特性进行研究。试验表明:(1)与DX桩下部承力盘位于粉黏土等较软弱土层相比,当上部承力盘置于粉黏土等较软弱土层、下部承力盘位于砂土层时,上盘盘阻所占比例较小,主要由下盘盘阻和端阻承担,DX桩的承载力将提高20%,且按规程计算值偏小;其后期控制沉降较好,沉降曲线呈现明显的缓降段,沉降速率呈变小趋势;(2)DX桩下盘设置于粉黏土等较软弱土层时,将明显影响上、下两承力盘阻发挥效力,降低整个DX桩承载力;(3)摩阻力发挥规律表明,在荷载向下传递过程中,无论软硬土层顺序如何,承力盘位于砂土层时,其承力盘盘阻、侧摩阻发挥效力总是优于承力盘位于粉黏土等较软弱土层。
[Abstract]:Based on the loading test of DX model pile in different soil layers, the load transfer law and load bearing characteristics of DX pile in soft and hard interactive soil are studied. The results show that: (1) compared with the lower bearing plate of DX pile in the soft soil such as silt clay, when the upper bearing plate is placed in the silt clay and the lower bearing plate is in the sand layer, the proportion of the upper plate resistance is smaller. The bearing capacity of DX pile will be increased by 20%, and the calculated value will be small according to the rules, and the settlement will be controlled well in the later stage, and the settlement curve will be obviously slow down, and the bearing capacity of DX pile will increase by 20%, and the calculated value will be small according to the rules. (2) when the DX pile footwall is placed in the silt clay and other soft soil layers, it will obviously affect the effect of the next two bearing plate resistance and reduce the bearing capacity of the whole DX pile; (3) the law of exerting frictional resistance shows that, in the process of load transfer down, No matter the order of soft and hard soil layer, when the bearing plate is located in the sand layer, the load plate resistance and the side friction are always better than the bearing plate in the silt clay and other weaker soil layers.
【作者单位】：北京交通大学;
【基金】：国家自然科学基金面上项目资助(51478035) 北京交通大学大学生创新性试验计划项目资助(140130051)
【分类号】：TU473.1

【相似文献】