In soil mechanics what is sand cone method?

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2009-09-08 09:30:30

The Sand Cone Method is a sand replacement method for

determining the field unit weight or the in-situ density of natural

or compacted soil. There are three standard procedures used for

determining this weight, including the Sand Cone Method, Rubber

Balloon Method and the Nuclear Method. In the Sand Cone Method, as

done in this lab, a hole is excavated in the area where the soil

has been compacted and the dry weight of the soil can be obtained

by determining the weight of the moist soil and the moisture

content. The volume for the hole excavated is calculated by

reintroducing the sand into the hole and then the dry unit weight

of compaction is calculated by dividing the dry weight of the soil

by the volume of the hole. This test method is applicable for soils

without appreciable amounts of rock or coarse materials in excess

of 1 1/2 in. (38 mm) in diameter. The main application of this test

is the cases like embankment and pavement construction, this is

basically a quality control test where a certain degree of

compaction is required. This test is also used in stability

analysis of embankments and slopes, for the calculation of pressure

in underlying strata for settlement problems and also design of

underground structures.

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