基于示踪法的土石坝裂缝发育深度检测及成因分析

根据探地雷达的检测原理，引入与土体介电常数差异较大、具有强烈反射性的示踪剂，结合探地雷达技术来检测某黏心墙土石坝裂缝的发育深度。通过对灌入示踪剂前后探地雷达检测剖面图像裂缝深度的对比分析，发现裂缝深度检测值提高了20%~50%。通过对坝体监测资料中坝体变形、库水位和裂缝开度进行相关性分析，发现土石坝正常运行情况下，坝体前后变形、水平竖向变形的不一致会引起坝体的开裂，库水位的变化是导致土石坝坝体开裂的主因。通过对坝体的裂缝发育深度的检测以及裂缝成因分析，为土石坝工程的管理和维修加固提供了科学的决策依据。

Detection and crack cause analysis of earth-rock dam crack development depth based on tracer method

Combined with ground penetrating radar technology, we introduces a highly reflective tracer, which has a large difference in dielectric constant compared with soils, to detect the development depth of earth-rock dam cracks. Through the comparative analysis on the crack depth of GPR detection profile image before and after filling the tracer, the crack depth detection value is increased by 20% ~ 50% after the filling. Through analysis of the correlation between dam body deformation, water level and cracks opening degree of dam body monitoring data, it is found that the inconsistent deformation between front and back of the dam as well as between horizontal and vertical orientation, and the variation of water level are the cracking causes of the dam. Through detection of the crack development depth of the dam body and the cause analysis of the cracks, the crack development and causes of the earth-rock dam are grasped in time, which provides a scientific decision-making basis for the management, maintenance and reinforcement of the earth-rock dam project.