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滑坡監測系統介紹

发布日期：2024-12-03 16:11:54 作者：揚塵檢測儀來源：揚塵監測系統浏覽量：1563

滑坡是一種常見的地質災害，是指山坡的土體或岩體在多種因素作用下，于重力影響下沿軟弱面或軟弱帶整體或分散順坡下滑的現象。

其形成受多种因素共同作用。比如地形地貌，坡度介于 10 度至 45 度且高差较大区域，以及由松散堆积层或风化破碎岩石构成的山体，因抗剪强度低，更易发生滑坡。

气象水文条件也极为关键，大量降雨不仅使岩土体含水量与重度增加，还会降低抗剪强度，持续性暴雨尤甚，同时河流对坡脚的冲刷会削弱支撑力，诱发滑坡。地震产生的地震波会破坏山体岩土体结构，改变应力状态，引发滑坡，如 2008 年汶川地震就导致众多山体滑坡。人类活动同样不容忽视，工程建设中不合理的开挖坡脚，像山区公路建设时的不当切坡，以及灌溉与排水系统不合理致使地下水位异常变化，都会破坏山体稳定性，增加滑坡风险。

滑坡监测系统基于全球导航卫星系统，如 GPS、北斗等，通过卫星发射信号，由固定于滑坡体及周边的 GNSS 接收机接收多颗卫星信号来确定位置。

在監測過程中，先在滑坡體不同部位及穩定區域合理布設監測點與基准點。接收機按設定時間間隔自動采集含三維坐標與時間信息的數據，存儲或傳輸至數據處理中心。數據處理時，先預處理去除噪聲等異常數據，再用差分技術提高定位精度，經分析得到監測點位移隨時間的變化情況，繪制位移時間曲線，還能綜合多監測點數據算出滑坡體變形速率、方向等參數。

當監測數據顯示滑坡位移超阈值，系統便自動預警，可通過短信、郵件或聲光報警裝置通知相關人員，以便及時采取疏散居民、封鎖道路等應急措施，有效防範滑坡災害帶來的風險與損失。

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