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目前微型桩基础在锚定、抗拔方面的研究非常匮乏,为确定其作为戈壁滩光伏电站抗拔基础的效果,进行了现场单桩抗拔静载荷试验,并在试桩桩身布置钢筋应力计,桩头处测量上拔位移。研究结果表明:轴力和侧摩阻力沿桩身的变化规律不仅与桩周土层性质有关,还与桩顶荷载大小有关,且轴力和侧摩阻力均存在一有效桩长H。土体与桩体之间的阻力和钢筋与桩体之间的阻力大小决定了微型桩的破坏模式:当前者小于后者时,破坏形式为桩周土体隆起,并出现径向和环向的裂缝;当前者大于后者时,破坏模式为钢筋被拔出,桩体混凝土出现裂缝。在试验条件下,微型桩的极限抗拔承载力与极限抗压承载力之比取ζ’=0.58较合适,建议取ζ’=0.58作为本地区同类型微型桩的计算参数。
At present, the research on anchoring and anti-pulling of the micro-pile foundation is very scarce. In order to confirm the effect of the micro pile foundation as the anti-pull foundation of the Gobi Solar PV power plant, the static pile static load test is carried out. Meter, pile head at the pull-out displacement measurement. The results show that the variation of axial force and lateral friction along the pile body is not only related to the nature of the soil around the pile, but also to the load of the pile head. And there is an effective pile length H between the axial force and the side friction. The resistance between the soil and the pile and the resistance between the reinforcement and the pile determine the failure mode of the micro-pile: when the former is smaller than the latter, the failure form is that the soil around the pile is uplifted and the radial and circumferential directions Of the cracks; the former is greater than the latter, the failure mode is pulled out of steel, concrete cracks pile. Under the experimental conditions, the ratio ζ ’= 0.58 of ultimate tensile strength and ultimate compressive strength of micro-piles is appropriate, and ζ’ = 0.58 is recommended as the calculation parameter of the same type of micro-piles in this area.