本文選題：沉樁　切入點(diǎn)：球孔擴(kuò)張　出處：《巖土工程學(xué)報(bào)》2016年09期

【摘要】：利用邊坡穩(wěn)定性計(jì)算方法,基于球孔彈塑性擴(kuò)張理論,研究了沉樁力、樁端塑性區(qū)以及樁體抗滑作用對(duì)沉樁過(guò)程中滑動(dòng)面安全系數(shù)的影響。通過(guò)算例,對(duì)沉樁全過(guò)程中滑動(dòng)面安全系數(shù)變化進(jìn)行了研究,并對(duì)樁徑,邊坡角度以及沉樁距邊坡頂點(diǎn)距離對(duì)沉樁過(guò)程中邊坡滑動(dòng)面安全系數(shù)變化的影響進(jìn)行了分析。結(jié)果表明:沉樁力及樁端塑性區(qū)對(duì)滑動(dòng)面穩(wěn)定性產(chǎn)生不利影響,使安全系數(shù)降低;當(dāng)樁體穿過(guò)滑動(dòng)面之后,樁體起到抗滑作用,顯著提高滑動(dòng)面安全系數(shù)。樁徑越大,沉樁前期安全系數(shù)下降速度越快,但樁端穿過(guò)滑動(dòng)面后安全系數(shù)提升也更加顯著;邊坡角度越大,沉樁后邊坡安全系數(shù)越小;沉樁離邊坡頂點(diǎn)越遠(yuǎn),在沉樁前期由于沉樁力導(dǎo)致的安全系數(shù)下降速度越慢,塑性區(qū)對(duì)安全系數(shù)的影響也逐漸減緩,當(dāng)沉樁遠(yuǎn)離邊坡頂點(diǎn)距離達(dá)到一定值后,沉樁將不再對(duì)滑動(dòng)面穩(wěn)定性產(chǎn)生影響。分析結(jié)果對(duì)鄰近邊坡沉樁的設(shè)計(jì)和施工具有一定的實(shí)用價(jià)值。
[Abstract]:Based on the elastic-plastic expansion theory of spherical holes, the influence of pile driving force, pile tip plastic zone and pile body anti-sliding on the safety factor of sliding surface in the process of piling is studied by using the slope stability calculation method. The variation of safety factor of sliding surface in the whole process of piling is studied, and the diameter of pile is also studied. The influence of slope angle and distance from the pile to the top of the slope on the safety factor of the slope sliding surface is analyzed. The results show that the piling force and the plastic zone at the end of the pile have a negative effect on the stability of the sliding surface, which reduces the safety factor. When the pile body passes through the sliding surface, the pile body plays a role of anti-sliding, and the safety factor of the sliding surface is improved significantly. The larger the diameter of the pile, the faster the safety factor of the pile sinking is decreased, but the more significant the safety factor is after the pile end passes through the sliding surface. The bigger the slope angle is, the smaller the slope safety factor is after piling, and the farther the piling is from the top of the slope, the slower the safety factor decreases due to piling force in the early period of piling, and the influence of plastic zone on safety factor is gradually reduced. When the piling distance from the top of the slope reaches a certain value, the stability of the sliding surface will no longer be affected by the piling. The results of the analysis have certain practical value for the design and construction of the pile driving on the adjacent slope.
【作者單位】： 上海理工大學(xué)土木工程系;
【基金】：國(guó)家自然科學(xué)基金青年基金項(xiàng)目(51208301)
【分類號(hào)】：TU473.1

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