一种静钻根植竹节桩非线性简化沉降计算方法（英文）

发布时间：2018-01-04 21:22

本文关键词：一种静钻根植竹节桩非线性简化沉降计算方法（英文）　出处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2017年11期 　论文类型：期刊论文

【摘要】：目的:静钻根植竹节桩是一种由预制桩和水泥土组成的组合桩基,其桩身具有预制桩-水泥土和水泥土-桩周土体两个接触面。本文以桩土接触面剪切试验、模型试验和现场试验数据为基础,提出一种静钻根植竹节桩简化沉降计算方法,为静钻根植竹节桩的沉降计算提供依据;并通过所提出的简化计算方法对静钻根植竹节桩桩端水泥土扩大头以及桩周水泥土直径对静钻根植竹节桩承载性能的影响进行研究。创新点:1.通过剪切试验对预制桩-水泥土接触面的剪切性能进行研究,得到接触面侧摩阻力与相对位移的关系;2.建立同时考虑预制桩-水泥土接触面和水泥土-桩周土体接触面作用的静钻根植竹节桩简化沉降计算方法。方法:1.通过桩土接触面剪切试验,得到预制桩-水泥土接触面摩擦模型;2.通过对模型试验结果的分析,得到水泥土-桩周土体接触面摩擦模型;3.根据试验结果编写静钻根植竹节桩沉降计算程序,通过与试验结果的比较验证所提计算方法的可靠性;4.通过提出的静钻根植竹节桩简化计算方法对静钻根植竹节桩承载力影响因素进行分析与研究。结论:1.预制桩-水泥土接触面摩擦性能远优于水泥土-桩周土体接触面摩擦性能;2.由于水泥浆的渗透作用,水泥土-桩周土体接触面的初始剪切刚度有所提高;3.所提出的计算方法能够有效地计算出静钻根植竹节桩单桩在成层土体中的荷载位移关系曲线;4.桩端水泥土扩大头能够有效地提高静钻根植竹节桩桩端承载性能,并且增加桩周水泥土直径能够提高静钻根植竹节桩承载性能。
[Abstract]:Objective: static drill root planting bamboo section pile is a kind of composite pile foundation composed of prefabricated pile and cement soil. The pile body has two contact surfaces: precast pile-cement soil and cement-soil-soil around the pile. In this paper, the shear test of pile-soil contact surface is carried out. Based on the data of model test and field test, a simplified settlement calculation method for static drilling root planting bamboo section pile is proposed, which provides the basis for settlement calculation of static drilling root planting bamboo section pile. Through the proposed simplified calculation method, the influence of the expanded head of cement soil and the diameter of cement soil around the pile on the bearing capacity of static drilling and planting bamboo segment pile is studied. 1. The shear behavior of prefabricated pile-cement soil interface was studied by shear test. The relation between side friction and relative displacement of contact surface is obtained. 2. To establish a simplified settlement calculation method for static drilling-rooted bamboo slub pile considering the interaction of precast pile-cement-soil interface and cement-soil-soil interface. Method: 1. The shear test of pile-soil interface is carried out. The friction model of prefabricated pile-cement soil interface is obtained. 2. Through the analysis of the results of the model test, the friction model of the interface between cement soil and soil around the pile is obtained. 3.According to the test result, the program of settlement calculation of static drill root planting bamboo section pile is compiled, and the reliability of the proposed calculation method is verified by comparing with the test result. 4. Through the simplified calculation method of static drilling root planting bamboo section pile, the factors influencing the bearing capacity of static drilling root planting bamboo section pile are analyzed and studied. 1. The friction performance of prefabricated pile-cement-soil interface is much better than that of cement-soil-soil interface. 2. The initial shear stiffness of the interface between the cement soil and the soil around the pile is improved due to the permeation of the cement slurry. 3. The proposed method can effectively calculate the load-displacement relation curve of single pile with static drilling and planting bamboo section in layered soil. 4. The pile end cement-soil expansion head can effectively improve the bearing capacity of the static drilling root planting bamboo section pile end, and increase the pile surrounding cement soil diameter can improve the static drilling root planting bamboo section pile bearing capacity.
【作者单位】： Research
【基金】：Project supported by the National Natural Science Foundation of China(Nos.51578498 and 51579217) the Science and Technology Plan Program of Ningbo,China(No.2013B81003) the China Postdoctoral Science Foundation(No.2017M611995) the Open Funding of the Key Laboratory of Geotechnical and Underground Engineering,Ministry of Education,China(No.KLE-TJGE-B1501)
【分类号】：TU473.1
【正文快照】： 1 IntroductionA number of studies have been conducted toinvestigate the behavior of single piles and pilegroups under compression.Randolph and Wroth (1978;1979)proposed a simplified analytical methodto describe the vertical deformation of single piles a

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