黄土斜坡桩基竖向荷载传递规律现场试验研究
发布时间：2018-07-28 17:37
【摘要】：结合某黄土斜坡桥梁桩基工程,对同一坡度相近位置的两根桩基开展现场试验,研究其在不同竖向荷载工况下的桩身上、下坡面两侧的轴力、桩侧摩阻力及桩侧土压力的传递规律与分布特征。试验表明:桩基荷载传递具有明显的区域性,第1区域是从桩顶至约3倍桩径深度处,此区域上坡面桩侧轴力较下坡面相应位置小,且其轴力随深度递减幅度及侧摩阻力发挥程度均较下坡面桩侧大;第2区域是从约3倍桩径至10倍桩径深度处,桩身上坡面一侧竖向受力减小幅度小于桩基下坡面一侧,但此时下坡面桩侧摩阻力发挥幅度大于桩基上坡面一侧;第3区域是从约10倍桩径直至桩端,该区桩身两侧轴力差异不大,摩阻力发挥幅度相近,荷载平衡协调且向下传递稳定。针对斜坡桥梁桩基上、下坡面两侧所受土压力的不均匀性,对设计桩基竖向承载力进行了一定程度地折减,并对计算公式作了相应修正,研究结论可供类似工程参考、借鉴。
[Abstract]:Combined with a loess slope bridge pile foundation engineering, field tests were carried out on two piles with the same slope, and the axial forces on both sides of the slope were studied under different vertical load conditions. The transfer law and distribution characteristics of pile side friction resistance and pile side earth pressure. The test results show that the load transfer of pile foundation is obviously regional, the first area is from the top of pile to about 3 times the depth of pile diameter, and the lateral axial force of pile on the slope is smaller than that on the lower slope. The axial force decreases with depth and the exertion degree of side friction is larger than that of downhill pile side, the second area is from about 3 times pile diameter to 10 times pile diameter depth, the vertical force of one side of pile body is smaller than that of pile foundation slope side. But at this time, the range of friction on the side of the downhill pile is greater than that on the slope of the pile foundation, and the third area is from about 10 times the pile to the end of the pile, the axial force on both sides of the pile body in this area is not different, and the range of friction is similar. The load balance is balanced and the transfer down is stable. In view of the uneven earth pressure on both sides of the slope bridge pile foundation, the vertical bearing capacity of the designed pile foundation is reduced to a certain extent, and the calculation formula is revised accordingly. The research conclusions can be used for reference in similar projects.
【作者单位】： 同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;厦门大学土木工程系;
【基金】：交通部西部交通建设科技项目(No.2009318812004) 国家自然科学基金项目(No.51209180,No.40872179) 中国博士后科学基金(No.2012M510137)
【分类号】：U443.15
，
本文编号：2151090
[Abstract]:Combined with a loess slope bridge pile foundation engineering, field tests were carried out on two piles with the same slope, and the axial forces on both sides of the slope were studied under different vertical load conditions. The transfer law and distribution characteristics of pile side friction resistance and pile side earth pressure. The test results show that the load transfer of pile foundation is obviously regional, the first area is from the top of pile to about 3 times the depth of pile diameter, and the lateral axial force of pile on the slope is smaller than that on the lower slope. The axial force decreases with depth and the exertion degree of side friction is larger than that of downhill pile side, the second area is from about 3 times pile diameter to 10 times pile diameter depth, the vertical force of one side of pile body is smaller than that of pile foundation slope side. But at this time, the range of friction on the side of the downhill pile is greater than that on the slope of the pile foundation, and the third area is from about 10 times the pile to the end of the pile, the axial force on both sides of the pile body in this area is not different, and the range of friction is similar. The load balance is balanced and the transfer down is stable. In view of the uneven earth pressure on both sides of the slope bridge pile foundation, the vertical bearing capacity of the designed pile foundation is reduced to a certain extent, and the calculation formula is revised accordingly. The research conclusions can be used for reference in similar projects.
【作者单位】： 同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;厦门大学土木工程系;
【基金】：交通部西部交通建设科技项目(No.2009318812004) 国家自然科学基金项目(No.51209180,No.40872179) 中国博士后科学基金(No.2012M510137)
【分类号】：U443.15
，
本文编号：2151090
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