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How to control the degree of compaction during subgrade filling.
1. Settlement observation method, that is, after a certain number of times of rolling by a vibratory roller, press the steel ball with a diameter of 10cm into the subgrade surface with a roller, then observe the elevation of the steel ball, then roll it, and then observe the steel ball to see the settlement value.

Second, the nuclear densitometer method

Third, according to the test section to determine the number of rolling times to control.