土遗址裂隙注浆加固效果评价中的无损检测应用

Application of non-destructive testing to evaluate the grouting reinforcement effect of fissures in earthen sites

针对土遗址注浆加固效果的无损检测,以瓜州桥湾城遗址为例,对现场裂隙及试验墙进行探地雷达扫描,使用声波仪、红外线热成像仪对注浆后的裂隙进行持续检测.结果表明,现场裂隙注浆较为饱满,浆-土兼容性较高,但部分张开度大的裂隙注浆后出现空洞和收缩缝.通过对裂隙注浆前后的探地雷达扫描数据对比分析,整体反映浆液内部饱满度;对裂隙注浆处持续声波波速的检测反映了浆液强度的变化情况,对比无裂隙处波速可反映局部注浆饱满度;提取分析红外线热成像仪采集的温度数据,可反映细部浆-土兼容性和界面的黏结性.现场应用证明上述无损检测方法较准确地反映了缺陷特征,可以从整体、局部及兼容性等多角度评价裂隙注浆的加固质量.

Aiming at the non-destructive testing of grouting reinforcement effect of fissures in earthen sites,the Qiaowancheng ruins in Guazhou were taken as an example.Ground penetrating radar(GPR)was used to scan the site fissures and test walls.The fissures after grouting were continuously tested by an ultrasonic instrument and infrared thermal imager.The application results showed that the in-situ fissure grouting was full and the grout-soil compatibility high,but some of the fissures with a large opening appeared like voids and had contraction fissures.Through a comparison and analysis of GPR scanning data before and after grouting in fissures,the inner fullness of grout was reflected as a whole.The variation of grout strength could be reflected by a continuous testing of the ultrasonic wave velocity at the grouting site of fissures,and the fullness of partial grouting could be reflected by comparing the wave velocity between areas without fissures.The temperature data collected by the infrared thermal imager were contrasted and analyzed,which could reflect the compatibility of detail area grout-soil and the cohesion of interface.The field application showed that the above non-destructive testing method could accurately reflect the defect characteristics and be used to evaluate the quality of fissure grouting reinforcement from the aspects of overall,partial and compatibility.