黄土地层微型桩水平承载力研究

发布时间：2018-02-23 18:21

本文关键词： 微型桩水平承载力室内试验回归分析假设检验　出处：《西安建筑科技大学学报(自然科学版)》2015年05期 　论文类型：期刊论文

【摘要】：对于微型桩水平承载力,在目前的研究中尚未有统一的并被工程界普遍接受的表达式,本文就此问题进行了研究.首先选用西安地区黄土作为试验模型的滑坡介质,在假定干密度保持不变的前提下,选择土体饱和度、桩径和桩间距作为影响因素,每个因素选取三个试验水平,按照正交试验方案,对微型桩进行了室内试验,得到了不同影响因素和试验水平下的水平承载力大小关系,并借助MATLAB数据拟合功能,对水平承载力进行了一次线性和二次非线性函数的回归分析,对回归函数系数分别运用假设检验的相关原理进行了评价,最后将二次非线性回归函数应用于工程实例中和原设计方案进行了对比.试验结果表明微型桩的水平承载力与饱和度呈反比、与桩径呈正比关系,且三个因素对水平承载力影响大小的排列顺序依次为饱和度桩径桩间距;回归结果展示了二次非线性回归函数相比一次线性能较好地吻合试验结果,且具有较高的拟合精度;实例对比结果显示了二次非线性回归函数能够满足设计抗滑力的要求.
[Abstract]:For the horizontal bearing capacity of micro-pile, there is no unified expression in the present research and is generally accepted by the engineering circles. This paper studies this problem. First, the loess in Xi'an area is chosen as the landslide medium of the test model. Based on the assumption that dry density remains constant, soil saturation, pile diameter and pile spacing are selected as influencing factors, and three test levels are selected for each factor. The relationship of the horizontal bearing capacity under different influencing factors and experimental levels is obtained. With the help of MATLAB data fitting function, the linear and quadratic nonlinear functions of the horizontal bearing capacity are regressed. The coefficient of regression function is evaluated by the principle of hypothesis test. Finally, the quadratic nonlinear regression function is applied to the engineering example and the original design scheme is compared. The experimental results show that the horizontal bearing capacity of the miniature pile is inversely proportional to the saturation and is directly proportional to the diameter of the pile. The order of the influence of three factors on the horizontal bearing capacity is in the order of saturation pile diameter pile spacing, and the regression results show that the quadratic nonlinear regression function is in good agreement with the test results and has a higher fitting accuracy than the primary linear regression function. The results show that the quadratic nonlinear regression function can meet the requirements of the design anti-slip force.
【作者单位】：北京交通大学土木建筑工程学院;西安建筑科技大学土木工程学院;
【分类号】：TU473.1

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