摘要
在岩溶地区、软硬岩交互等复杂地质条件下,由于施工工艺的局限性,桩基成孔易不规则,这给低应变桩基检测带来不利影响。为了研究低应变法在复杂地质条件下基桩检测分析判定的准确性问题,以低应变基本原理为出发点,从理论层面分析了常见基桩缺陷的特征表现;通过对几种实测典型基桩低应变缺陷的分析,探究其产生的原因,并利用现场开挖、钻芯法对低应变检测结果进行对比,验证了低应变法在复杂地质条件下判定桩身质量的适用性和准确性。研究结果表明,低应变法在复杂地质条件下仍能有效地判定桩身缺陷,宜结合现场开挖、钻芯法和声波透射法综合判定。
Under complex geological conditions such as karst area and layers with hard and soft rock interbed, the pore-forming of foundation pile is easy to be irregular due to the limitation of construction technology, which brings an adverse effect on the low-strain detection of piles. In order to study the accuracy of low-strain method in pile detection and analysis in these cases,the characteristics of common pile defects are theoretically analyzed based on the principle of low strain. Through the analysis of several measured low-strain defect curves of typical piles,the causes are explored. Comparing with the results of field excavation and core drilling method,the applicability and accuracy of low-strain method in determining pile quality under complex geological conditions are verified. The results show that low-strain method is still effective in determining the defects of pile under complex geological conditions,and it is advisable to combine excavation,core drilling and acoustic wave transmission to determine the defect comprehensively.
作者
王乾龙
Wang Qianlong(China Railway Design Corporation,Tianjin 300251,China)
出处
《铁道勘察》
2019年第4期66-69,共4页
Railway Investigation and Surveying
关键词
低应变法
复杂地质
分析判定
工程质量
Low-strain method
Complex geology
Analysis and determination
Construction quality
