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针对海阳#1核电站吊装点位置施工荷载大且周期长、地质复杂、紧靠边坡边缘的特点,吊装设备对吊装点地基变形要求很高,基于变形控制和复合桩基的设计理念采用二次压浆微型桩满足了吊装点地基对强度和变形的双重要求。同时,吊装点位置微型桩桩顶与上部钢筋混凝土承台连接在一起对边坡的稳定起到很大作用。由于承台底部受到下部微型桩的完全约束,相当于在顶部设置了一排长而密的锚杆,对约束边坡上部变形提高边坡的整体稳定性也起到很大作用。本工程的相关研究理论和实施方法不仅适用于海阳6座核电站,而且对世界上所有工程的大型吊装区域的地基处理起到借鉴作用。
In view of the large load, long period and complicated geological conditions at the hoisting point of Haiyang # 1 nuclear power plant, close to the edge of the slope, the hoisting equipment has high requirements on the foundation deformation of the hoisting point. Based on the design concept of deformation control and composite pile foundation, Secondary grouting micro-piles to meet the lifting point of the foundation on the strength and deformation of the dual requirements. In the meantime, the connection between the top of mini-pile and the upper reinforced concrete cap at the lifting point plays an important role in the stability of the slope. Because the bottom of the cap is completely restrained by the lower mini-piles, it is equivalent to having a row of long and dense bolts at the top, which also plays a great role in the stability of the upper part of the confined slope to improve the overall stability of the slope. The relevant research theory and implementation methods of this project not only apply to 6 nuclear power plants in Haiyang, but also serve as a reference for the foundation treatment of large-scale hoisting areas in all the projects in the world.