基桩及地连墙质量缺陷地球物理探测现状及展望

Status and Prospect of Geophysical Exploration on Quality Defects of Piles and Diaphragm wall

对于基础性工程如基桩和地连墙,混凝土构件质量安全问题有着重大的意义。而传统检测方法多是有损的和定性的,已无法满足当前工程检测需求,需要开展较为全面和精确的质量缺陷检测。首先对传统检测方法的优缺点进行了详细讨论分析,指出传统检测方法可有效用于定性解释,但无法给出混凝土构件质量缺陷的定量推断。然后对应用于混凝土构件质量缺陷的反演成像检测技术进行探讨,明确了超声波层析成像及探地雷达反演成像技术的发展及其应用现状,表明了反演成像检测技术中快速而稳定收敛算法的重要性。最后,通过分析混凝土质量缺陷检测的需求,对比现有成像技术及应用局限性并结合超声波成像的技术优势,指出基桩及地连墙质量缺陷属性现场快速提取技术或将是未来应用于此领域发展的主要方向。

The quality and safety of concrete members are of great importance for the fundamental engineering such as foundation piles and diaphragm wall.Traditional detection methods,however,are mostly destructive and qualitative,and fail to meet the needs of the current engineering test.Therefore,it requires more comprehensive and accurate quality inspection.This paper discusses and analyzes the advantages and disadvantages of the traditional detection methods in detail,pointing out that they can be effectively used for qualitative interpretation,but can not give quantitative inference in the quality inspection of con-crete structures.Meanwhile,this paper emphasizes the application and exploration of quality defects in the inversion imaging detection technology of concrete structures,and specifies the development and application status of ultrasonic tomography and ground-penetrating radar inversion imaging technology and indicates the importance of a fast and stable convergent algorithm in inversion imaging detection technology.Finally,by analyzing the demand for concrete quality defect detection,comparing the limitations of existing imaging technical and combining the technical advantages of ultrasonic imaging,it points out that the rapid extraction technology of the properties of foundation piles and diaphragm wall quality defects may be the main direction for the future application in this field.