【摘要】：砂襯齒形樁是砂襯與帶齒的預(yù)應(yīng)力管樁相結(jié)合,形成一種復(fù)合承載的樁。以小孔擴(kuò)張理論為基礎(chǔ),研究樁側(cè)圓孔擴(kuò)張及樁端球孔擴(kuò)張作用的影響,分析砂襯齒形樁豎向及側(cè)向承載力的發(fā)揮機(jī)制。結(jié)果表明,樁側(cè)摩阻力增大是由樁-土間摩擦力和樁齒間重塑土體抗剪切力產(chǎn)生的。考慮壓樁過(guò)程對(duì)土體擾動(dòng)的影響,方程中加入土體擾動(dòng)修正系數(shù)進(jìn)行修正,并分析樁齒間剪切力在樁承載力中所占比例。用分析計(jì)算結(jié)果與國(guó)家規(guī)范、地方標(biāo)準(zhǔn)及現(xiàn)場(chǎng)靜載試驗(yàn)結(jié)果對(duì)比分析,驗(yàn)證了分析計(jì)算結(jié)果是正確可行的。此研究分析方法對(duì)砂襯齒形樁在生產(chǎn)實(shí)踐中的運(yùn)用及后續(xù)的改進(jìn)提供了理論分析基礎(chǔ),研究?jī)?nèi)容具有重要的現(xiàn)實(shí)意義。
[Abstract]:The sand-lined toothed pile is a kind of composite bearing pile which is combined with sand-lining and pre-stressed pipe pile with teeth. Based on the theory of small hole expansion, the influence of the expansion of circular hole on the side of the pile and the expansion of the spherical hole at the end of the pile is studied, and the mechanism of vertical and lateral bearing capacity of the sand-lined toothed pile is analyzed. The results show that the increase of frictional resistance is caused by the friction between pile and soil and the shear resistance of remolded soil between piles and teeth. Considering the influence of pressure pile process on soil disturbance, the correction coefficient of soil disturbance is added to the equation, and the proportion of shear force between teeth of pile to pile bearing capacity is analyzed. The results of analysis and calculation are compared with those of national code, local standard and field static load test, and the results are proved to be correct and feasible. This research and analysis method provides a theoretical analysis basis for the application of sand-lined toothed pile in production practice and further improvement, and the research content has important practical significance.
【作者單位】： 昆明理工大學(xué)建筑工程學(xué)院;云南省普洱市思茅區(qū)鴻程檐展工程咨詢(xún)有限公司;云南省設(shè)計(jì)院集團(tuán)勘察分院;十四冶建設(shè)云南勘察設(shè)計(jì)有限公司;
【基金】：國(guó)家自然科學(xué)基金聯(lián)合基金(No.U1502232)~~
【分類(lèi)號(hào)】：TU473.1

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