大直径嵌岩桩侧阻强化桩土界面影响因素研究

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摘要嵌岩桩的荷载传递受许多因素影响。不少资料表明，桩端支承较强时，嵌岩桩的侧阻沿桩长分布呈顶、底部较大的特点，且常表现出硬化趋势。通过对某工程试桩端阻、侧阻发挥过程的分析，指出桩土界面上的正应力、桩与土相对运动速度以及桩周土层接触关系等都构成影响侧阻发挥的重要条件。尝试通过直剪试验验证影响侧阻发挥影响因素，结果表明：(1) 桩周土强度较低时，桩下沉速度较快，桩土相互作用常沿“界面层”进行，侧阻出现软化特征；(2) 桩周土强度较高时，桩土界面相互作用充分，侧阻以硬化特征为主，覆压越大，侧阻硬化特征越明显；(3) 土层接触关系对桩周土强度发挥与上覆土压力有关，上覆压力大，桩周土的强度可以产生叠加效应，发挥出超过单一土层抗剪强度的侧阻力。

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关键词 ：桩基础, 嵌岩桩, 桩侧阻力, 桩土界面, 侧阻强化

Abstract：It is well known there are many factors influencing the shaft resistance of rock-socketed pile. Statistics indicate that the shaft resistance of rock-socketed pile has a tendency to increase when the bearing capacity of the layer under the pile is high. This paper tries to calibrate the factors influencing the shaft resistance of the pile by direct shear test. In the test，the shear rate is controlled to simulate the settlement velocity of piles；and also soil contact relationship is considered. Main results are shown as follows：(1) Subsidence velocity of pile is manly affected by the strength of the layer under the pile. Settlement rate of the pile is greater when the layer is soft，then interaction between soil and pile will spread along interface layer. (2) The shaft resistance along the pile shows characteristics of hardening when the bearing layer is hard. The greater thickness of soil layer around the pile (which will produce greater lateral earth pressure)，the more significance of hardening will show. (3) The contact relationship of the strata around the pile will play importance role in the shaft resistance. Under larger lateral pressure around the pile，the side resistance may produce a superimposed effect，and thus is greater than that calculated by shear strength according to the theoretical formula.

Key words： pile foundations rock-socketed pile side resistance pile-soil interfaceside resistance strengthens

收稿日期: 2013-08-13

引用本文:

蔡江东1，2，夏红春3. 大直径嵌岩桩侧阻强化桩土界面影响因素研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3062-3067.
CAI Jiangdong1，2，XIA Hongchun3. INFLUENTIAL FACTORS OF PILE-SOIL INTERFACE OF LARGE-DIAMETER ROCK-SOCKETED PILE AS ITS SIDE RESISTANCE STRENGTHENS. , 2014, 33(sl): 3062-3067.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3062

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