In roadbed construction, excessive soil is used to fill subgrade because of weather and construction schedule constraints and other reasons.
在公路路基施工中，天气及施工工期的限制等原因，会经常遇到采用过湿土填筑路基的情况。
2
When the sea soil layer is, softer, the greatest stress for elastic constraints is larger than that for fixed one. The difference in critical length of hanging segment is not much.
当地层较软时，弹性约束时管道中的最大应力比固定端约束的要大，而临界悬空长度相差不多。
3
Aluminum is one of the major constraints limiting rice productivity in acidic soil, which inhibits growth and minerals absorption of rice root.