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探地雷達：地下CT，地災滑坡的防治

发布日期：2025-07-14 13:17:42 作者：揚塵檢測儀來源：揚塵監測系統浏覽量：490

探地雷达的工作原理基于电磁波传播特性。它向地下发射高频电磁波，电磁波在地下介质传播时，一旦遇到不同介质的分界面，像土壤与岩石、空洞与密实土体的界面，由于介质电磁特性有差异，部分电磁波就会反射回来。探地雷达的接收天线捕获反射波后，经数据处理和分析，便能绘制出地下结构图像。这就像给地下部分做了 “CT”，清晰呈现出地下空洞、裂缝、软弱层等潜在地质灾害隐患的位置、大小和分布。在山区道路探测中，探地雷达可精准识别山体内部因岩石破碎、地下水侵蚀形成的空洞，评估山体滑坡风险。

傳統地質探測方法，像鑽探，不僅對地面有破壞，效率還低，難以全面探測大面積區域。探地雷達卻能在不破壞地面的情況下，快速完成大面積掃描。在對大面積山區進行滑坡隱患排查時，利用直升機搭載探地雷達，能快速獲取大範圍地下地質信息，高效找出潛在滑坡隱患區域。

利用探地雷達對滑坡體進行實時監測，能及時掌握其動態，爲防災減災爭取寶貴時間。探地雷達可通過定期監測，捕捉地質體隨時間的動態變化。在滑坡易發區域，受時間和外界因素影響，山體內部岩土體會逐漸位移、變形。探地雷達對比不同時期探測數據，若發現山體內部某些區域反射波特征異常改變，如反射波強度、相位明顯變化，就能判斷該區域岩土體結構可能改變，進而分析滑坡風險是否加劇，及時發出預警。在城市，地下水位升降、地下管線滲漏等因素會使路基土體密實度變化，探地雷達持續監測，能及時察覺這些變化，預防地面塌陷。

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