兰州地区深基坑支护技术探讨

分析兰州地区深基坑支护的设计和施工现状,探讨适合于兰州地区的深基坑支护技术.分别介绍土钉墙支护、土钉加预应力锚杆联合支护、框架预应力锚杆支护技术的作用机理,结合工程实例说明其在兰州地区的应用.实践证明,这3种支护技术适合于兰州地区.当基坑深度小于8.0 m时,采用土钉墙比较合适;当基坑深度在8.0~10.0 m之间时,可以考虑采用土钉加预应力锚杆的复合支护结构;当基坑深度大于10.0 m时,选择框架预应力锚杆支护结构更加合理.

Inquiry into supporting technique of deep excavation in Lanzhou region

The current situation of design and construction of supporting for deep excavation in Lanzhou region was analyzed and the supporting technique of deep excavation suitable for Lanzhou region was inquired.The working principles of supporting technique including soil nailed wall,supporting structure of soil nails with prestressed anchors,and supporting structure of framed prestressed anchors were introduced respectively.Combined with engineering projects,the application of these supporting techniques in Lanzhou region was illustrated.Engineering practices showed that the above three kinds of supporting structures were suitable for Lanzhou region.When the excavation depth was less than 8.0 m,the soil nailed wall should be adopted.When the excavation depth was between 8.0 m and 10.0 m,the supporting structure of soil nails and prestressed anchors could be considered.When the excavation depth was more than 10.0 m,the supporting structure of framed prestressed anchors was more reasonable.