Forward simulation and engineering application of borehole ground penetrating radar for grouting effect detection

作者：Li Yao; Liu Bin^*; Li Shucai; Zhang Qingsong; Zhang Xiao; Yang Lei

来源：Electronic Journal of Geotechnical Engineering, 2016, 21(13): 4895-4909.

• Compaction grouting
• Forward simulation
• Fractured rock
• Fracturing grouting
• Ground Penetrating Radar
• Permeation grouting

Due to the concealment of grouting, the specific distribution of the grout injected into rock and soil can't be detected accurately, and this often leads to poor grouting effect. Ground Penetrating Radar (GPR) is a fast non-destructive detecting method with high resolution. In practical project, core drilling is often used to evaluate the grouting effect, so borehole GPR can be used to detect the grouting effect accurately by deep into the rock and soil with tens of meters. This paper classifies grouting by its principle and makes forward models of permeation grouting, compaction grouting, fracturing grouting and fractured rock grouting. We used finite-difference time-domain method to carry out forward simulation of borehole GPR detection and came up with the propagation law of electromagnetic waves, which provides theoretical basis for grouting effect evaluation. Eventually, we used borehole GPR to analyze the grouting effect in a practical project. Numerical examples and practical project show that borehole GPR can obtain information such as the diffusion range of grout, the shape and distribution of grouted vein and the existence of defects after grouting into fractured rock, which can be used to evaluate the grouting effect.

• 出版日期2016