750kV输电线路戈壁碎石土地基直柱掏挖基础试验  

Testing Study on Excavated Column Foundation for Towers of 750 kV Transmission Line in Northwest Gobi Gravel Area

作　　者：李永祥 张西 周吉安[2] 

机构地区：[1]甘肃省电力设计院,兰州市730050 [2]甘肃省电力公司,兰州市730050

出　　处：《电力建设》2010年第9期22-25,共4页Electric Power Construction

基　　金：国家电网公司科技项目(SGK〔J2008〕1360)

摘　　要：戈壁碎石土地基是我国西北750kV输电线路建设中的典型地质条件。为了减少开挖回填基础的工程应用,充分利用戈壁碎石土地基的良好胶结性能和抗剪强度,减少工程材料消耗量,提出了戈壁碎石土地基直柱掏挖基础型式。选择3个典型地质条件完成了12个直柱掏挖基础的现场施工和静载荷试验,给出了相应的设计方法和计算参数。结果表明:戈壁碎石土地基中应用的直柱掏挖基础具有良好的抗拔承载性能,其施工安全性高,经济环保,能够满足750kV输电线路杆塔基础荷载要求,可以在该地区750kV输电线路铁塔基础中使用。Gobi gavel soil is the typical ground for the towers of 750 kV transmission lines in the northwest China.In order to utilize the good engineering property of the undisturbed Gobi gavel soil,and to reduce the consumption of construction material,the excavated column foundation is proposed for Gobi gavel ground.Static loading tests were performed on 12 excavated vertical column foundations on three different typical grounds,and corresponding design methods and computation parameters were obtained.It is indicated that the excavated vertical pile foundation,being good in uplift bearing capacity,safe in construction and good in economy and environmental protection,can be used as tower foundations for 750 kV transmission lines in Gobi gavel soil.

关 键 词：750KV输电线路 戈壁碎石土 直柱式掏挖基础 试验研究 抗拔承载力 侧摩阻 

分 类 号：TM75[电气工程—电力系统及自动化] TU41[建筑科学—岩土工程]