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当用砾石堆筑土坝时,可籍试坑在现场上测定土壤的紧密度,这是检查填土质量的基本方法之一。这个方法,已有十分详细的记载,此处仅简略地叙述于下: 为了测定砾石的么重,在工地上应预先整理出一块平坦地面,它的大小为40×40公分,在它的中心掘一试坑,坑的直径为25～30公分,深度为20～25公分,并取出坑中的土壤。用已知久重的均匀砂土,完全填满试坑,根据用砂的数量,可以测定试坑的休积,将体积除以取出的土重,则可得土壤的么重。
When using earth and gravel piles, the test pit can be used to determine the tightness of the soil in the field, which is one of the basic methods of checking the quality of fill. This method, which has been described in great detail, is briefly described here: In order to determine the weight of the gravel, a flat surface should be prefabricated on the worksite, measuring 40 x 40 cm in its center Dig a pit, the pit diameter of 25 to 30 cm, the depth of 20 to 25 cm, and remove the soil in the pit. With known long-lasting uniform sand, completely fill the pit, according to the amount of sand, test pits can be determined by the volume divided by the removal of soil weight, you can get the weight of the soil.