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隧道衬砌与围岩之间及塌方区回填注浆体内部的空洞数量和范围受到严格限制,以求最大程度提高隧道整体承载力和密实性,确保工程优质安全。为此简要探讨了地质雷达无损探测空洞的机理,并在云南麻栗坡隧道应用LTD-2100地质雷达对衬砌和塌方区回填注浆体密实性进行检测。对比空洞填修前后的探测结果可知地质雷达探测法具有快速、精确定位空洞并随之有针对性实施钻孔注浆的巨大优势,从而为大型隧道工程开展高效无损检测以期大幅度提高其安全储备及质量等级提拱了强有力手段,同时拓展了地质雷达在地球物理勘探学科中的应用领域。
The number and scope of cavities within the tunnel lining and the surrounding rock and backfill grouting body in the landslide area are strictly limited in order to maximize the overall bearing capacity and compactness of the tunnel so as to ensure the project quality and safety. This paper briefly discusses the mechanism of non-destructive detection of geo-holes by GPR, and tests the compactness of backfill grouting in lining and landslide areas by using LTD-2100 geological radar in Malipo tunnel in Yunnan province. Comparing the detection results before and after the hole filling shows that the GPR detection method has the advantages of rapid and precise positioning and correspondingly great advantages of drilling grouting, so as to effectively and nondestructively test the large-scale tunnel engineering in order to improve its safety reserve And quality levels to mention a powerful means arch, while expanding the field of geophysical radar applications in geophysical exploration.