Study On Engineering Characteristics Of Weathered Sandstone Subgrade

With the mountain highway construction transfer to re-Hill District, how to use the wide range of weathered rock embankment to filling the local distribution and compensate for the mountain lack of quality stone is a urgent solution.The paper in summing up at home and abroad related literature .Then Analysis of weathered rock that filling the engineering properties of roadbed. Research weathered sandstone for different degrees in material properties in Actual situation and give different degree of weathering the weathered sandstone broken compaction of test methods and evaluation methods.The paper give degree of weathering the weathered sandstone material performance test methods on water, temperature, load and other factors .There are Texpansion of material, broken collapse, the loss of quality, long-term performance and capacity changes on performance in the methods.Test analysis showed that the standard evaluation method sandstone compaction of the broken roadbed construction consided the process of compaction work under the weathered sandstone compaction broken.So the actual works in sandstone to reflect the effective fragmentation. In order to simulate the roadbed after which natural conditions, the pilot used the water temperature cycle tests on sand particles and the collapse of changes in the quality of the test. Weathering index is to evaluate the degree of weathering weathered sandstone quantitative indicators. Through the sand particles of less than 0.075 mm, and weathered clay mineral content of the product of two parameters associated with the material properties of research, this evaluation index weathered sandstone weathering degree of quantitative indicators for the safety of weathered sandstone used in roadbed filling Provide an accurate basis.