灌浆质量检测的声波CT法及其与综合检测效果的对比

Sound wave CT of the cement injection quality detection and comparison between its effect with that of the comprehensive detection

以灌浆质量检测为实例,简述了声波成像原理和三种反演算法,说明了ART算法、CGLS算法和LSQR算法的特点。通过对三种算法特点的比较,在实际工作中,利用直射线法建立初始模型、弯曲射线法成像,经过反复迭代,取得了更好的效果。将CT结果与声波单孔、跨孔测试结果、钻孔弹模结果对比,吻合程度相当好,同时也表明声波CT在灌浆质量检测等工程勘察工作中具有不可替代的优势。重要的是,声波CT和声波单孔、跨孔及弹性模量测试等方法综合评价灌浆效果,更加客观、准确。

The paper illustrates the principle of sound wave computer tomography and three inverse algorithms and explains the characteristics of ART, CGLS and LSQR with a typical case of the cement injection quality detection. Actually, by comparing the three algorithms, the authors make use of the straight ray method to built the preliminary model and bend ray tomography and get good effects by back and forth successive substitution. The contrast of the results of CT, single-borehole and crossborehole probing and hole elasticity modulus does not only show that they fit quite well, but also shows that CT is more visual, delicate and exact than the single-borehole and cross-borehole probing in the cement injection quality test and the other engineering exploring, and has an irreplaceable advantage.