基于低应变动测法的双向粉喷桩桩身质量评价

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摘要低应变动测法桩基检测技术,具有检测速度快、反应直观、适应性强等特点,目前该方法在桩基（钻孔灌注桩和预应力管桩）工程检测中得到广泛应用,但在粉喷桩的桩身完整性和桩长检测过程还存在大量的问题还有待进一步进行探索。文中探讨了双向粉喷桩单桩检测方法的适用程度及具体标准,提出用低应变动测法评价双向粉喷桩的桩身强度、桩长等特性以及对检测效果的影响因素分析,并通过现场取芯检测进行对比分析,验证了该法在双向粉喷桩检测的适用性,并在连云港至临沂高速公路（江苏段） LL-8 标双向粉喷桩处理的工程中使用,取得较好的检测效果。

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	谢胜华
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	季鹏

关键词 ：桩身完整性, 低应变动测法, 双向粉喷桩, 有效桩长

Abstract：The low-strain reflection wave method for the pile foundation is an inspection technology. It has advantages such as rapid detection speed, intuitive reaction, strong adaptability. At present this method has been widely used in pile foundation (cast-in-situ bored piles and prestressed pipe piles). Nevertheless problems still exist in terms of monitoring of pile shaft completeness and pile length for DJM piles. In this study, the applicability and specific standards of inspection methods for bidirectional DJM piles are discussed. The low-strain dynamic test method is proposed to detect the strength the pile length and characteristics of bidirectional DJM pile body. Through the in-situ core tests, this method is verified in term of bi-directional DJM pile tests, and applied in Lianyungang-Linyi highway (Jiangsu province) LL-8 section bidirectional DJM pile project, and convinced results are achieved.

Key words： pile integrity low strain integrity testing bidirectional dry jet mixing column critical length of column

收稿日期: 2011-08-03

TU473

基金资助:国家自然科学基金项目( 50879011)；江苏省交通科技项目

作者简介: 谢胜华 (1977 – ) ,男,安徽怀宁人,博士研究生,讲师,主要从事土力学、高速公路软弱地基处理等方面的研究与教学工作。

引用本文:

谢胜华, 刘松玉, 杜广印, 季鹏. 基于低应变动测法的双向粉喷桩桩身质量评价[J]. 岩土工程学报, 2011, 33(sup2): 64-68. XIE Sheng-hua, LIU Song-yu, DU Guang-yin, JI Peng. Quality evaluation of pile integrity by bidirectional dry jet mixing method based on low-strain integrity tests. Chinese J. Geot. Eng., 2011, 33(sup2): 64-68.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2011/V33/Isup2/64

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