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通过现场真型试验,对灌注细石混凝土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。试验表明:在本次试验条件下,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;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;微型桩群桩抗拔极限承载力可以通过单桩抗拔极限承载力乘以桩数和群桩效应系数计算得到,本次试验条件下,微型桩抗拔群桩效应系数选取0.75进行计算。
Through the field true type test, the anti-pull bearing mechanism and the calculation method of anti-pull bearing capacity of perfusion fine aggregate concrete mini pile foundation were studied. The experimental results show that under the test conditions, the pull-out bearing capacity of the micro-pile can be composed of the self-weight of the pile and the frictional resistance of the pile circumference. Because of the redistribution of the uplift load, The maximum bearing capacity of corner piles, the next piles and the smallest piles. The ultimate bearing capacity of mini piles can be calculated by multiplying the ultimate bearing capacity of single piles by the pile number and group pile effect coefficient. Under this test condition , The effect of micro-pile pull-pull pile group selection of 0.75 to calculate.