有覆土层的强风化岩锚桩结构模型的研究  

Study on Anchor-bolt Structural Model in Strong-weathered Rock Region with Earthed Layer

作　　者：刘福卿[1] 王茂成 蒋瑞金[1] 高晓东[1] 孟庆波 刘小萍 周建中 李强 

机构地区：[1]山东电力集团公司,济南市250001 [2]烟台电力设计院,山东省烟台市264002 [3]海南中海电力工程有限公司,海口市570000 [4]烟台供电公司,山东省烟台市264000

出　　处：《电力建设》2009年第8期42-46,共5页Electric Power Construction

基　　金：山东电力集团公司科技项目(2008A-14)

摘　　要：根据强风化岩地区锚桩基础的试验、研究和应用情况,结合烟台220kV新港输电工程中对强风化岩扩底锚桩直线塔基础的设计,认为:试验单锚桩应采用抗拉(屈服)强度高的锚杆和高标号混凝土(可固结锚杆减少弹性变形量);锚杆抗拉强度设计值大于试验拉应力最大值,破坏性的试验结果才能够正确反映单锚桩和直锚桩在弹性变形范围内岩体的极限抗剪承载力、锚桩与岩体间的极限粘结承载力;锚杆增加锚板和锚孔扩底等强锚固措施可改善锚杆上部内力集中的现象,增强锚桩基础的抗拔稳定性。According to present anchor foundation test report, research and application in internal strong-weathered rock region, and in combination with design experience for attempting enlarged base anchor foundation of suspension tower in Yantai 220 kV Xin-Gang transmission line project, we think that single-anchor bolt test should use high yield strength anchor-boh and high strength grade concrete （it can consolidates anchor-bolt to reduce elastic deformation）. When the tensile strength design value of anchor-bolt is bigger than the maximum test tension stress, the destructive test result can reflect correctly geotechnlcal ultimate sheafing bearing capacity of single and straight anchor-bolts within elastic deformation scope, and ultimate adhesive bearing capacity between anchor-bolt and strong-weathered rock. The enhanced anchorage measures, such as increasing anchor plate and enlarged base, may improve internal force concentration of upper anchor-bolt, enhance uplift stability of anchor foundation.

关 键 词：强风化岩 锚杆 抗拉强度 扩底 承台式直锚基础 

分 类 号：TU476.9[建筑科学—结构工程]