低应变动测桩及锚杆中波的传播规律差异研究  

Research on transmit rules of stress wave with low strain in dynamic test pile and anchorage bolt

作　　者：孙冰[1,2] 曾晟[1] 丁德馨[1,2] 綦春明[1] 喻清[1] 

机构地区：[1]南华大学核资源与核燃料工程学院,湖南衡阳421001 [2]中南大学资源与安全工程学院,长沙410083

出　　处：《岩土力学》2011年第4期1143-1148,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.50274043);湖南省教育厅项目(No.09C854;No.08C758);湖南省建设厅项目(No.[2007]425-29);湖南省安全生产项目(No.HN09-25);省重点学科建设项目资助

摘　　要：应力波法是检测桩基与锚杆质量的一种快速、有效的无损检测方法,运用该法对桩基与锚杆进行质量检测时均基于一维杆件的波动理论,波速是进行二者质量判断的最基本参数,部分研究和工程技术人员易将两种应力波速混淆,可能会造成实际检测中的误判。为此,以自由锚杆和不同龄期下标准混凝土试块中的应力波速为参考,采用低应变反射波法对桩基和锚杆中的应力波速进行了对比研究。研究表明,桩基中的应力波速与锚杆中的应力波速存在较大的差别,前者略大于标准规格混凝土试件中的波速,而后者小于自由锚杆中的应力波速大于桩基和标准混凝土试块中的波速;桩基和混凝土试块中的应力波速与龄期和强度近似服从上升指数关系,而锚杆中的应力波速与龄期和强度近似服从下降的指数关系。Nondestructive testing with stress wave in piles and anchorage bolts is a kind of quick and effective detection method based on the one-dimensional wave theory; stress wave velocity is the basic parameter for quality assessment; the researchers and engineers often confuse the wave velocities in piles and anchorage bolts, hence incorrect assessment in practical detection. Therefore, by using wave velocities in free bolt and standard concrete sample under different curing ages as references, comparative study of stress wave velocities in a pile and an anchorage bolt is made based on low strain wave reflection method. The results indicate that the wave velocity in the pile is larger than that in the standard concrete sample; the wave velocity in the anchorage bolt is smaller than that in the free bolt but larger than that in the pile and the standard concrete sample; the wave velocities in the pile and standard concrete sample vs. curing age and strength are nearly ascending exponential relationship; while the wave velocity in anchorage bolt vs. curing age and strength is nearly descending exponential relationship.

关 键 词：岩土工程 低应变 动测 锚杆 桩基 波速 

分 类 号：TU473.16[建筑科学—结构工程]