砂砾石固结灌浆后的三轴蠕变试验研究  

Triaxial creep test for gravel strengthened by consolidation grouting

作　　者：左永振[1] 赵娜[1] 张婷[1] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《人民长江》2013年第24期49-53,共5页Yangtze River

基　　金：水利部公益性行业科研专项经费项目(201201039);国家自然科学青年基金(51309024)

摘　　要：为降低深厚覆盖层上坝基的工后变形,常需要对大坝基础进行固结灌浆处理。采用大型三轴蠕变试验仪,对固结灌浆前后的砂砾石试样进行三轴蠕变试验,通过计算蠕变量和相关蠕变参数对固结灌浆效果进行分析。研究结果表明,固结灌浆后的砂砾石蠕变量与时间呈幂函数关系,符合九参数模型;固结灌浆后的轴向蠕变量和体积蠕变量较固结灌浆前均有大幅度的降低。试验成果表明,固结灌浆对降低大坝原地基的后期蠕变变形等有较好的效果。Consolidation grouting for dam foundation is often carried out for reducing foundation settlement after construction, especially for the dams that are constructed on deep overburden layers. We carried out a large - type triaxial creep test for gravel samples consolidated by grouting, and the grouting effect is assessed through calculating creep values and relative creep parame- ters. The research results show that the relation of creep and time after consolidation can expressed by power function, complying with the nine - parameter model; the creep value and volume creep value reduced significantly after consolidation grouting. The experiment demonstrates that consolidation grouting has perfect performance in decreasing subsequent creep deformation of dam foundation.

关 键 词：固结灌浆 坝基处理 深厚覆盖层 三轴蠕变试验 砂砾石 

分 类 号：TV42[水利工程—水工结构工程]