文档介绍：DDC桩处理变电站厚层湿陷性黄土地基的研究
刘丽萍1 ,王胜利2
(,西安 710032;,西安 710054)
摘要:对于变电站厚层湿陷性黄土地基,采用常规处理方法遇到施工上的困难,且沉降控制指标难以保证。孔内深层强夯挤密桩(DDC桩)具有自身的特点和优势,对330kV变电站而言又是首次采用,通过现场三个试桩区的试验表明,孔内深层强夯法经合理设计各参数后,能消除厚层湿陷性黄土地基的湿陷性,同时又提高了地基的承载力,是一种经济有效的地基处理方法。
关键词: 孔内深层强夯;黄土;湿陷性;变电站
Study on Treating Thick-bedded Collapsible Loess of Converting Station by Down Hole paction
LIU Li-ping1 ,WANG Sheng-li2
(1. Department of Civil Engineering,Xi’an Technological University, Xi’an 710032,China;2. Civil Office, Shaanxi electric power design institute, Xi’an 710054)
Abstract:For thick-bedded collapsible loess of converting station,conventional treatment technique is difficult during construction,and settlement controlled index is not easy to achieve. Down hole paction(DDC pile)is dominant,and is used for 330kV converting station first time. The three test piles results indicate:after rational parameter design,down hole paction can eliminate collapsibility of thick-bedded collapsible loess,and increase ground load capacity at the same time. It is an economical and actual ground treatment technique.
Key words: down hole paction; loess; collapsibility; converting station
1 引言
现行规范规定对于湿陷性黄土场地,特别是严重湿陷性黄土场地的建构筑物,其地基处理通常采用灰土挤密桩,但因成孔施工工艺的限制,大于12米桩长的施工很困难。因此,对于厚层湿陷性黄土的处理,灰土挤密桩显得力不从心。变电站建构筑物对地基沉降甚为敏感,严格的工后沉降控制对厚层湿陷性黄土地基的处理提出了更高的要求,为了确保工程中建构筑物的安全,有效消除湿陷性及提高地基承载力,拟采用孔内深层强夯挤密桩(简称DDC桩)处理地基,其在建筑