Interface identification in weathered granite strata based on a instrumented drilling system
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摘要: 針對香港風化花崗巖場址勘探,在液壓旋轉鉆機上安裝鉆孔過程監測系統(drilling process monitoring,DPM),對有效軸壓力、鉆具轉速、沖洗壓力、鉆頭位移及穿孔速率進行了實時監測.采用變斜率作為顯著性指數,對地層中的主、次界面進行了識別.t檢驗表明,DPM系統對巖土界面識別的置信度為99%.此外,對穿孔參數在界面處的變化分析表明,這些參數隨孔深的變化曲線在界面處存在不同漲落,軸壓力和穿孔速率對界面上巖石強度變化的響應度為81.82%.Abstract: A hydraulic rotary drill instrumented with a drilling process monitoring system (DPM) was used for site investigation in Hong Kong weathered granite foundation engineering. The penetrating parameters such as effective thrust force, rotational speed, flushing pressure, penetrating rate and displacement of the bit were monitored in real time. A varied slope was defined as a significant index for identification of dominative and subsidiary interfaces in the granite site. The result from t-test shows that the confidence of the DPM in identification of the geotechnical interfaces is 99%. Besides, the analysis of variation of the penetrating parameters at the interfaces indicates that there are different fluctuations at the interfaces in the curves of the parameters with borehole depth. The response degree of effective thrust force and penetrating rate to the variation of rock strength at the interfaces is 81.82% alone.
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