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用地質雷達探測巷道圍岩松動圈

发布日期：2025-07-28 11:07:14 作者：揚塵檢測儀來源：揚塵監測系統浏覽量：463

在地下工程施工中，巷道圍岩的穩定性關系到施工安全與工程壽命。巷道開挖後，原岩應力平衡被打破，圍岩內部會形成一定範圍的松動區域，即圍岩松動圈。這一區域的岩體結構破碎、強度降低，易引發塌方、片幫等地質災害，因此需要施工方准確探測松動圈的範圍和特征。

地質雷達探測技術基于電磁波傳播原理實現對松動圈的探測。核心原理是利用高頻電磁波在不同介質中的傳播速度、反射強度差異，判斷岩體結構變化。當電磁波從發射天線傳入圍岩後，遇到松動圈與完整岩體的界面時，會發生反射，接收天線捕捉反射信號後，經數據處理形成雷達圖像。

松動圈內的岩體因破碎程度高、裂隙發育，介電常數與完整岩體存在明顯差異，導致電磁波在該區域傳播時出現速度變化和能量衰減，這些特征會在雷達圖像中形成特定的反射波形。通過分析這些波形特征，結合地質資料，可確定松動圈的邊界位置和範圍。反射波能量強、波形紊亂的區域通常對應松動圈範圍，而完整岩體區域的反射信號則相對穩定、連續。

地質雷達探測技術具有非破壞性、高效率、分辨率高等優勢，已成爲巷道圍岩松動圈探測的主要手段之一，爲地下工程的安全施工提供了可靠的技術支持。

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