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地铁深基坑工程在轨排井等特殊位置或基坑宽度较大地段适宜采用锚索,而在软弱土层中锚索抗拔力难以保证,采取扩大头锚索能大幅度提高锚索抗拔力。本文介绍广州市地铁五号线三鱼区间轨排井段锚索设计施工情况,在软弱土层中采取扩大头锚索成功经验和失败教训,为进一步推广应用扩大头锚索提供有益参考。
In the deep excavation project of the subway, the anchorage cable is suitable for the special position such as in-orbit well or a large section of the foundation pit, but it is difficult to guarantee the pull-out force of the anchorage cable in the soft soil layer. Expanding the head cable can greatly improve the anchorage resistance Pull force. This paper introduces the design and construction of cable anchors in the three-fish section of Guangzhou Metro Line No.5, adopts the successful experiences and failures of expanding the anchors in the soft soil layer, and provides a useful reference for further popularization and application of the anchors.