昆明银杏金川花园深基坑支护技术

Strut Technology of Deep Foundatipn Pit for the Kunming Yinxing Jinchuan Huayuan Project

昆明银杏金川花园基坑周边条件较复杂,开挖深度在12.9-14.6 m,需支护长度496.5 m。施工中因地制宜采取了不同支护方案,以土钉支护、冠梁、腰梁、钻孔桩加锚索支护及锚喷网和深层搅拌桩、旋喷桩、及摆喷桩等形成止水帷幕进行综合支护。监测结果表明：地表沉降最大实测值为24.67 mm,桩顶及土体水平位移15 mm,均小于允许值。

The environmental conditions of the foundation pit of Kunming Yinxing Jinchuan Huayuan project are quite complicated.When their underground foundation being excavated down to 12.9-14.6 m depth,then must have a strut protection length 0f 496.5 m.During construction a variety of strut has been applied such as soil nailing,top beam,girdle beam,bored piles combined with prestressed anchor cable and water-repellent purdah formed by spurting anchorage network deep mixing piles,jet grouting piles and swing jet grouting piles,different struts are adopted in different specific conditions.Investingalions and surveys have clearly shown that the maximnm ground settlement is 24.67 mm.and the horizontal displacement of pile-top and soil-body is 15 mm.All of the are both smaller than the allowable value.