黄土冲沟斜坡桥梁桩基竖向承载特性模型试验研究

发布时间：2018-05-23 09:47

本文选题：岩土工程 + 黄土冲沟　；参考：《岩土工程学报》2015年12期

【摘要】：为了探明黄土冲沟地形条件对桥梁桩基础承载力的影响,首次基于自主研发的能充分反映黄土冲沟区域桩基础特点与工作性能的模型试验平台,分析不同冲沟坡度、不同桩长桩基的竖向承载力,桩身轴力及桩侧摩阻力的变化规律,并结合试验结果提出相关的工程技术建议。研究结果表明:1随着坡度的增大,相同桩长的桩基承载力呈降低趋势,承载力影响度逐渐增大,变化范围在7%~35%之间;2在一定范围内,桩基承载力随桩长增加增幅越大,桩长增加到一定程度时,承载力增幅逐渐变缓;3随着坡度增加,相同入土深度下的有效桩长逐渐减小;4黄土冲沟斜坡区域桥梁桩基设计应充分考虑防止桩周土体流失的工程技术。
[Abstract]:In order to find out the influence of loess gully topographic condition on the bearing capacity of bridge pile foundation, a model test platform which can fully reflect the characteristics and working performance of pile foundation in loess gully region is developed by ourselves for the first time, and different gully slopes are analyzed. The variation law of vertical bearing capacity, axial force of pile body and frictional resistance of pile side of pile foundation with different pile lengths are discussed, and relevant engineering technical suggestions are put forward based on the test results. The results show that with the increase of slope, the bearing capacity of pile foundation with the same pile length tends to decrease, and the influence degree of bearing capacity increases gradually. The range of variation is between 75% and 35%, and the increase of bearing capacity of pile foundation increases with the increase of pile length. When the length of pile increases to a certain extent, the increase of bearing capacity gradually slows down with the increase of slope. The effective pile length at the same depth should be reduced gradually and the engineering technology of preventing soil loss around the pile should be fully considered in the design of bridge pile foundation in the slope region of loess gully.
【作者单位】：长安大学公路学院;陕西省高速公路建设集团公司;陕西省西安市中交通力建设股份有限公司;中国电建集团西北勘测设计研究院有限公司;中国科学院地球环境研究所;
【基金】：陕西省科技攻关项目(09-04) 陕西省自然科学基础研究计划项目(2013JM7016)
【分类号】：U443.15

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