砂土中考虑冲刷的水平受荷桩等效应变楔方法

发布时间：2018-06-17 19:24

本文选题：冲刷效应 + 水平受荷桩　；参考：《岩土力学》2015年10期

【摘要】：冲刷引起桩周土体的损失,研究冲刷效应对桩基水平承载特性的影响非常必要。基于桩前土体楔形受力的应变楔方法可以推导桩侧p-y曲线,进而分析水平受荷桩的受力变形特性,但只适于地表水平的情况。基于冲刷坑坑底以上土体的自重荷载对楔形体的开展范围进行深度等效,建立了冲刷条件下砂土中水平受荷桩的等效应变楔方法。通过与文献对比,验证了该方法的可行性。研究结果表明:冲刷深度增加,冲刷坑底宽度增大及冲刷坡角减小均会降低桩基水平承载性能。与仅考虑冲刷引起的桩侧极限抗力削弱的简化方法相比,本研究得到的桩基最大弯矩偏小。将冲刷坑底以上土层全部剥蚀的做法,忽略了冲刷深度内的土层作用,计算结果会偏于保守。
[Abstract]:Erosion causes soil loss around piles, so it is necessary to study the effect of scour effect on horizontal bearing characteristics of pile foundation. The strain wedge method based on the wedge force of soil in front of the pile can deduce the p-y curve of the pile side, and then analyze the deformation characteristics of the horizontally loaded pile, but it is only suitable for the situation of the surface level. The equivalent strain wedge method for horizontal loaded piles in sand under scour conditions is established based on the depth equivalence of the development range of wedges under the self-weight loads of soil above the bottom of the scour pit. The feasibility of the method is verified by comparing with the literature. The results show that the increase of scour depth, the increase of scour bottom width and the decrease of scour slope angle will decrease the horizontal bearing capacity of pile foundation. Compared with the simplified method of reducing the ultimate resistance of pile side caused only by scouring, the maximum bending moment of pile foundation obtained in this paper is smaller. If the soil layer above the bottom of the scour is completely eroded, the effect of the soil layer within the scouring depth is neglected, and the calculation results will be conservative.
【作者单位】：同济大学土木工程学院地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;
【基金】：国家973计划课题(No.2013CB036304) 国家自然科学基金项目(No.51378392)
【分类号】：TU473.1

【共引文献】