本文選題：高噴階梯型變截面插芯組合樁　切入點(diǎn)：承載特性　出處：《湖南工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文在總結(jié)高噴插芯組合樁研究成果的基礎(chǔ)上,提出了高噴階梯型變截面插芯組合樁及復(fù)合地基新技術(shù)。通過大比例室內(nèi)模型試驗(yàn)及數(shù)值仿真分析等手段,對(duì)比研究了豎向荷載作用下等截面樁、階梯型變截面樁及高噴階梯型變截面插芯組合樁承載性狀。主要研究內(nèi)容有:1、在豎向荷載作用下,進(jìn)行了高噴階梯型變截面插芯組合樁室內(nèi)大比例模型試驗(yàn)。對(duì)比研究了豎向荷載作用下等截面樁、階梯型變截面樁及高噴階梯型變截面插芯組合樁荷載-沉降、樁側(cè)摩阻力分布規(guī)律。研究結(jié)果表明:高噴階梯型變截面插芯組合樁承載能力階梯型變截面樁等截面樁。2、利用3DFLAC,建立了階梯型變截面樁、高噴階梯型變截面插芯組合樁及等截面樁的數(shù)值模型。對(duì)比研究了豎向荷載作用下等截面樁、階梯型變截面樁及高噴階梯型變截面插芯組合樁的工作性狀。討論了變徑位置、不同水泥土厚度、水泥土強(qiáng)度、土體粘聚力、土體內(nèi)摩擦角對(duì)高噴階梯型變截面插芯組合樁承載特性的影響。數(shù)值模擬結(jié)果表明:高噴階梯型變截面插芯組合樁承載能力階梯型變截面樁等截面樁;變徑位置、水泥土厚度、水泥土強(qiáng)度、土體粘聚力、土體內(nèi)摩擦角對(duì)提高單樁承載能力,降低樁身沉降有一定影響。
[Abstract]:On the basis of summing up the research results of high shotcrete core-inserted composite pile, this paper puts forward a new technology of high spray ladder-type core-inserted pile with variable cross-section and composite foundation. By means of large scale indoor model test and numerical simulation analysis, etc. In this paper, the load-bearing behavior of equal section pile, stepped variable cross section pile and high jet stepped variable cross section inserted core pile under vertical load is studied comparatively. The main research contents are: 1, under vertical load, In this paper, a large scale model test is carried out for high spray stepped variable cross section composite pile with variable cross section. The load-settlement of equal section pile, step type variable section pile and high jet step variable cross section composite pile under vertical load are compared. The research results show that the stair variable cross section pile with variable cross section is constructed by using 3DFLAC, and the load bearing capacity of the pile with variable cross section is equal to that of variable cross section pile with variable cross section. In this paper, the numerical models of variable cross section composite pile and equal section pile with variable cross section of high jet are compared. The working characteristics of pile with equal section, variable section pile of step type and high jet type pile with variable cross section under vertical load are compared, and the position of variable diameter is discussed. Different thickness of cement-soil, strength of cement-soil, cohesive force of soil, The influence of internal friction angle of soil on the bearing characteristics of high jet stepped variable cross section composite pile with variable cross section. The numerical simulation results show that the bearing capacity of high jet step variable cross section composite pile with variable cross section is equal to that of step variable cross section pile, the variable diameter position, the thickness of cement soil, and so on. The strength of cement soil, the cohesive force of soil and the angle of internal friction of soil have certain influence on increasing the bearing capacity of single pile and reducing the settlement of pile body.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU473.1

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