Experimental Studies on the Salt Expansion Law of Gravel Sulfate Saline Soil under the Five Factors of Salt Expansion

摘要

In order to learn gravel sulfate saline soil can be used as roadbed filler, the salt expansion law of gravel sulfate saline soil was experimental studied. In high and low temperature testing device, large salt expansion tests were carried under the change of temperature, salt content, initial density, water and overlying load. The tests were based on the soluble salt content preparation method of screening method of 5mm. It was shown that the salt expansion volume increased with the cooling rate slowed down. The sensitive temperature range of gravel sulfate saline soil was during -5°C-10°C. The allowable salt content of gravel sulfate saline soil was around 2%, when the gravel sulfate saline soil was used as roadbed filling.