光纤测温技术用于夹泥灌注桩完整性检测的试验研究

Detecting the integrity of bored piles with mud intercalated based on optical fiber temperature measurement in laboratory

提出基于光纤测温技术的夹泥灌注桩完整性检测方法,详细介绍该方法的主要仪器设备及检测过程。在分析光纤与灌注桩传热过程的基础上,阐述基于光纤测温技术的夹泥灌注桩完整性检测方法的基本原理。开展完整桩模型试验,研究不同加热功率下桩体中光纤温升规律,发现桩体中光纤温升与加热功率之间具有良好的线性关系,比较桩内与空气中光纤温升差异。开展含泥量分别为33.3%,50%,66.7%与100%的夹泥缺陷桩模型试验,研究不同夹泥桩中光纤温升与加热功率的关系,发现含泥量与光纤温升之间存在确定性关系。通过以上研究,验证基于光纤测温技术的夹泥灌注桩完整性检测方法的可行性。

A method to detect the integrity of bored piles with mud intercalated based on the temperature measurement technology with optical fiber was proposed. The measurement apparatus and process were introduced in detail. The basic principle of this method was described by the heat-transfer process between the optical fiber and bored pile. Integrity pile model tests were carried out. The linear relationships between the temperature rise and heating power were obtained. The differences of temperature rise of optical fiber in bored pile and in air were compared. The tests about piles with mud intercalated were carried out containing four different kinds of clay contents,33.3%,50%,66.7%,and 100% respectively. The relationships between the heating power and the optical fiber temperature rise were analyzed and a good linear relationship was discovered. The results indicate that the method is feasible for integrity detection of bored pile with mud intercalated.