本研究以音訊監測儀器系統，監聽高壓噴射灌漿工法之水泥漿切削土壤時所產生之音訊，來間接地評估高壓噴射灌漿噴射流在土壤中之能量衰減情況。並分別於日本、東南亞、台灣、香港等地，進行現地足尺寸試驗，蒐集在不同地質和施工參數條件下，高壓噴射灌漿之切削音訊值，作為成型樁品質量化指標之依據。由於在定點處，測音管所收集到之高壓噴射灌漿切削波峰值，有呈現常態分佈曲線的現象。因此本研究以噴射流波峰之平均值和標準差作為指標，再藉由此兩參數隨距離增加之變化情況，分別使用噴射流聲訊波峰之平均值衰減速率和標準差斜率，判斷高壓灌漿之噴射流能量，隨距離的增加而衰減及擴散程度。此外，本研究再從施工參數(灌漿流量、鑽桿旋轉速度、及鑽桿提升速度)、土壤性質(黏土、粉土質砂、砂土)、排泥措施、和噴射材料等因子，判斷各因子對切削能量衰減之影響，並找出敏感度較大的因子。其中，在有效樁徑之內、外，噴射流音訊在黏土層之波峰平均值衰減速率有很大差異。因此可由波峰平均值隨距離衰減速率所回歸出之曲線，推估出有效樁徑，作為評估黏土層高壓灌漿樁有效樁徑的參考。

An acoustic monitoring instrument system was used in this study to monitor the sound generated during high-pressure grouting work, where the cement jet cut through the slurry and soil. On-site acoustic monitoring tests were carried out in Japan, Southeast Asia, Taiwan, and Hong Kong at various ground conditions. The monitor pipes installed at different distances around the jet nozzle collected the sound prints. It was found that the peaks of the sound prints produced by the grouting jet at a certain distance showed a normal distribution curve pattern. Therefore, the average values and standard deviation of the jet sound prints are used as indicators. The change of these two indicators with distance is used to judge the effectiveness of jet cutting through the average attenuation rate and the standard deviation slope of the acoustic peak generated by the grouting jet flow.
In this study, the construction parameters (e.g., grout flow rate, drill pipe rotation speed, and drill pipe lift-up rate), soil properties (clay, silty sand, sandy soil, etc.), mud drainage measures, and grout jet materials are used as the influencing factors of the attenuation of jet grouting energy. Their influences on the pattern of jet grouting energy attenuation were studied and the more sensitive factors were identified. Since the average attenuation rate of the acoustic peaks inside and outside the effective cutting limit is different in clayey soil, the regression curve can be used to estimate the effective pile diameter produced by jet grouting work.

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