This paper expounds the conditions and features of plastic deformation of the rediairolling ring, anaiyses the instantaneous maximum of the screwdown and derives the calculatingformulas for the rolling time and the feeding speed.

On the fill compaction standard of the expressway;

Based on a series of compression tests under different compactness and stress conditions on five representative soil samples from Lalin River-Changchun expressway, the authors have found the settlement characteristics of compacted fill of road foundation.

This article firstly analyzes the connotation of the maximum dry density got from the standard compaction test of the compacted fill,deduces the formula of the absolute maximum dry density in theory ;at the same time,had an anatomy of the application of two kinds of maximum dry density;finally,discussed how to use the absolute maximum dry density to test and inspect the corretness of the data.

Analysis of earth pressure on top of culverts;