| 联用筛析法与激光法进行粒度接序分析的界点选择 |
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| 引用本文： | 冷伟,范代读.联用筛析法与激光法进行粒度接序分析的界点选择[J].沉积学报,2014,32(3):478-484. |
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| 作者姓名： | 冷伟 范代读 |
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| 作者单位： | 同济大学海洋地质国家重点实验室; |
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| 基金项目： | 国家自然科学基金(批准号:41076016,41276045);中国地质调查局海洋地质保障工程专项(编号:GZH201100203);中央高校基本科研业务费专项联合资助 |
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| 摘 要： | 筛析法、激光法和图像法是三种常用的粒度分析方法，但由于测试原理的不同，三种测试方法有不同的适用性。筛析法和图像法能够精确测量砂质颗粒的粒径，但不适用于泥质细颗粒（<0.063 mm）的粒径测量；相反，激光法无法准确测量中粗砂粒级颗粒（2~0.21 mm），但能高精度测量较细沉积物粒径。分选较差的天然沉积物粒径分布范围较广，需要综合运用筛析法-激光法进行接序粒度测试。通常选用2 mm为界点开展接序粒度分析，但因激光法在测量中粗砂颗粒时误差较大，易导致接序粒度分析结果准确性不高。建议以0.21 mm为分界点开展接序粒度分析，分别避开筛析法和激光法测量精度不高的粒级区间，可使测试结果的准确性得到有效的提高。
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| 关 键 词： | 粒度分析 激光法 筛析法 图像法 接序粒度分析 |
| 收稿时间： | 2013-05-07 |
Selecting Nodal Size for the Application of Combined Using Sieving and Laser Methods in Grain-size Analysis |
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| Abstract: | Three common grain size analysis methods, including sieving, laser and image analysis, have their different applicability because of the varied measurement principles. Sieving and image analyses are accurate to measure size of sandy grains but not of muddy grains (<0.063 mm). In contrast, laser analysis can measure accurately the fine-grained size but not for coarse particles with size larger than 0.21 mm. It is therefore needed to combine using sieving and laser methods consecutively (SLMC) in order to measure poorly sorted natural sediment samples with wide size distribution. A nodal size of 2 mm is commonly selected to carry out SLMC size analysis, but the measurement precision is usually not good enough because of inaccurate probing of middle-coarse sand grains by laser method. It is recommended to choose 0.21 mm as the nodal size for SLMC size analysis, and the measurement accuracy can be effectively improved when poor probing size ranges of sieving and laser methods have been successfully avoided. |
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