广州中旅商业城深基坑支护技术

STRUT TECHNOLOGY OF DEEP FOUNDATION PIT FOR THE GUANGZHOU ZHONGL COMMERCIAL CITY PROJECT

广州中旅商业城基坑周边条件较复杂，开挖深度１６～１８ｍ，需支护段长２４０ｍ。施工中因地制宜采取了不同的支护方案，以钢管桩、普通锚杆、预应力锚杆及锚喷网和已有的止水帷幕组成综合支护。监测结果表明：地表沉降实测最大值为２７．８８ｍｍ，桩顶及土体水平位移１９．００ｍｍ，均小于允许值。

The environmental conditions of the foundation pit of Guangzhou Zhongl Commercial City project are quite complicated.When their underground foundation being excavated down to 16～18 m depth,there must have a strut protection length of 240 m.During construction,a variety of strut-plans have been adopted to cope with the site' s surroundings,such as struts of steel tube piles,common anchorages,prestressed anchor bars,spurting anchorage network and dewatering curtain comprehensive struts.Investigations and surveys have clearly shown that the maximum ground settlement is 27.88 mm,and the horizontal displacement of pile-top and soil-body is 19.00 mm.All of them are both smaller than the allowable value.