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通过现场真型试验,对微型桩基础抗拔承载机理及其抗拔承载力计算方法进行了研究。试验研究表明:微型桩单桩抗拔承载力可由桩身自重和桩周侧摩阻力相加组成;二次注浆有利于提升微型桩抗拔承载力,在进行微型桩抗拔承载力计算时应考虑二次注浆的提升作用;群桩基础中布置斜桩可采用10度倾角;由于承台对上拔荷载的重分配,在上拔荷载作用下,角桩承力最大,边桩次之,中桩最小;本次试验条件下,微型桩抗拔群桩效应系数可取0.7进行计算。
Through the field true type test, the anti-pull bearing mechanism of micro-pile foundation and its calculation method of anti-pull bearing capacity were studied. The experimental results show that the pull-up bearing capacity of the micro-pile can be composed of the self-weight of the pile and the frictional force of the pile circumference. The secondary grouting is beneficial to increase the anti-pull-out bearing capacity of the micro pile. The effect of secondary grouting should be considered. Inclined piles arranged in group pile foundation can be inclined by 10 degrees. Due to the redistribution of the uplift load by the caps, under the effect of uplift load, Of the pile in the smallest; under the conditions of this test, the effect of micro-pile pull-pull pile effect factor of 0.7 can be calculated.