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1.《规程》表9是以“甲_1”比重计与平均质地为根据而定的。以广厂比重计(太短,约为“甲_1”的70%左右)与《规程》表9来测白浆土,可以把质地定为砂壤土,这显然是错误的。各实验室应根据各自长短不同的比重计制定沉降时间表。 2.固定一比重计后,根据平均质地定沉降时间,测出结果是可以用的,但有误差。在初测之后,再根据实际读数定沉降时向再测一次,它的准确度与常用比重计法同,这是准确的速测法。 3.平均质地的确定,可以误差理论为根据,应在三角形的中心,即三种土粒百分数都为33.3%,如水分为4%,则三种土粒均为16克,则<0.02mm土粒读数为32,<0.002mm土粒读数为16。这样可使总的误差较少,对各种质地的土壤不致有倚轻倚重问题。 4.《规程》的修改意见将机械分析改回到按《土壤理化分析》做,问题的性质不变;即根据“甲_1”比重计而定的沉降时间表不是对各种长短不同的比重计都能适用的。
1. “Regulations” Table 9 is based on the “A _1” hydrometer with the average texture as the basis. It is obviously wrong to take the weight of the broad factory (too short, about 70% of “A _1”) and Table 9 of the “Procedure” to test the white earth so that the texture can be set as sandy loam. The laboratories shall, according to their different length of the hydrometer set the settlement schedule. 2. Fixed a specific gravity meter, according to the average settlement of settlement time, measured results can be used, but there are errors. After the initial test, and then based on the actual reading set when the settlement to re-test, its accuracy and commonly used hydrometer method, which is accurate speed test method. 3. The determination of the average texture, based on the error theory, should be in the center of the triangle, that is, the percentage of three types of soil particles are 33.3%, such as water is 4%, the three soil particles are 16 grams, then <0.02mm Soil particle reading 32, <0.002mm soil particle reading of 16. This will make the total error less, on a variety of texture of the soil will not rely on reliance on heavy problems. 4. Amendments to the “Procedures” To change the mechanical analysis back to “physical and chemical analysis of the soil”, the nature of the problem remains unchanged; that is, the settlement schedule based on the “A_1” hydrometer does not vary for different lengths Gravimeter can be applied.