人工挖孔桩低应变反射波法完整性检测的局限性研究

doi:10.3969/j.issn.1001-5485.2014.02.013

长江科学院院报 ›› 2014, Vol. 31 ›› Issue (2): 62-67.DOI: 10.3969/j.issn.1001-5485.2014.02.013

人工挖孔桩低应变反射波法完整性检测的局限性研究

郭庆清^{1a, 1b, 2}, 陈维文^{1a, 1b}, 张绍和^{1a, 1b}

(1.中南大学 a.有色金属成矿预测教育部重点实验室;b.地球科学与信息物理学院,长沙 410083;2.中国人民武装警察部队水电第七支队,江西鹰潭 335000)

收稿日期:2014-01-27 修回日期:2013-03-07 出版日期:2014-01-26 发布日期:2014-01-27
通讯作者: 陈维文(1986- ),男,湖南邵阳人,硕士研究生,主要从事地质工程、岩土工程等研究工作,(电话)15773157929(电子信箱)344718459@qq.com
作者简介:郭庆清(1967- ),男,江西泰和人,高级工程师,硕士,主要从事水电基础工程、岩土工程方面的设计与施工,(电话)18679408866(电子信箱)CSUCWW@126.com
基金资助:
湖南省自然科学基金(07JJ6089)

Research on the Limitations of Wave Reflection Method in Low Strain Integrity Testing for Hand-dug Pile

GUO Qing-qing^1,2,3,CHEN Wei-wen^1,2,ZHANG Shao-he^1,2

1.Key Laboratory of Metallogenic Prediction of Nonferrous Metals under Ministry of Education,Central South University, Changsha 410083, China; 2. School of Geosciences and Info-physics,Central South University, Changsha 410083, China; 3. Hydropower Seventh Detachment ofChinese People’s Armed Police Forces, Yingtan 335000, China

Received:2014-01-27 Revised:2013-03-07 Published:2014-01-26 Online:2014-01-27

摘要/Abstract

摘要： 目前国内外对低应变完整性检测的局限性所做的研究主要集中于尺寸效应,而对于在自身成桩工艺及周边地层的综合影响下的人工挖孔桩低应变反射波法完整性检测的局限性少有涉及。介绍了低应变反射波完整性检测原理,结合湖南某电厂工地进行了大量的现场检测,采集测试曲线进行分析,利用钻芯法对若干检测时程曲线异常的基桩进行验证,作出正确判断,并在人工挖孔桩低应变反射波法完整性检测的局限性这个问题上进行了深入研究。最终得出相应结论桩周地层、桩端持力层的性质及桩长会影响桩端反射,护壁、桩周地层变化、阻抗变化界面处的二次反射都将对低应变检测产生干扰,桩土相互作用下可能会使低应变检测失效。

关键词: 低应变反射波完整性检测, 人工挖孔桩, 钻芯法, 局限性

Abstract: Previous researches on the limitations of low strain integrity testing with wave reflection method were focused on the size effect of stress wave propagation. The limitations of integrity testing for hand-dug pile in consideration of the pile-forming process and the pile’s surrounding strata were rarely researched. With the construction site of a powerplant in Hunan province as an example, we carried out a large number of field low-strain tests on hand-dug piles, and analyzed the collected time-history curves. Through core-drilling method, we checked the foundation piles with abnormal time-history curves, and estimated their integrity. We conclude that the pile tip reflection is affected by surrounding strata, properties of the bearing layer of pile tip, and pile length. The low strain testing with wave reflection method is interfered by hole-protection wall, variation of pile surrounding strata, and secondary reflection at the interface with different impedances. It will probably fail to detect under the influence of interaction between pile and soil.

Key words: low-strain integrity testing with wave reflection method, hand-dug pile, core-drilling method, limitation

中图分类号:

TU473.16

郭庆清, 陈维文, 张绍和. 人工挖孔桩低应变反射波法完整性检测的局限性研究[J]. 长江科学院院报, 2014, 31(2): 62-67.

GUO Qing-qing,CHEN Wei-wen,ZHANG Shao-he. Research on the Limitations of Wave Reflection Method in Low Strain Integrity Testing for Hand-dug Pile[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2014, 31(2): 62-67.

人工挖孔桩低应变反射波法完整性检测的局限性研究

Research on the Limitations of Wave Reflection Method in Low Strain Integrity Testing for Hand-dug Pile

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