高裂隙卵石地质条件深基坑工程顺逆结合施工技术

Construction Technology of Combination of Down-top and Top-down Method for Deep Foundation Pit Under the Geological Condition of High-cranny Pebble Geology

针对临江高裂隙卵石地质条件下预应力锚索无法施工,且基坑紧邻市政交通要道、不具备放坡条件的贵州都匀福安国际广场深基坑工程,传统的“支护桩+预应力锚索”支护方案已经不可行。在此情况下,经工程参建各方共同研究,总结并应用了“预留反压土+顺逆结合施工”的深基坑工程施工技术,有效解决了高裂隙卵石地质中锚索无法施工不能给支护桩提供锚固作用的问题,确保了基坑的安全,在本工程实践中取得了良好的效果,可为类似条件下深基坑工程施工提供参考和借鉴。

In view of the fact that the anchor cable can not be constructed under the geological conditions of the high-cranny pebble close to riverside,and that the foundation pit of Fu’an International Plaza in Duyun County,Guizhou Province is close to the main road of the municipal traffic,which does not have the conditions for slope setting-up,so the traditional"supporting pile+prestressed anchor cable" support scheme is no longer feasible.In this case,the construction technology of "reserved back pressure of soil+combination of down-top and top-down" for deep foundation pit is summarized and applied through the research of all parties concerned,and good results are obtained in the practice of this project,which can provide reference for similar projects.