Standard penetration test soil density
Pros and Cons
The standard penetration test (SPT) is an in-situ dynamic penetration test designed to provide The main purpose of the test is to provide an indication of the relative density of granular deposits, such as sands The usefulness of SPT results depends on the soil type, with fine-grained sands giving the most useful results.
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Description:This test is still used because of it's simplicity and low cost. It can provide useful information in very specific types of soil conditions, but is not as accurate as a Cone Penetration Test. Here's more information about this basic soil testing procedure. For this test, a sample tube, which is thick walled to endure the test environment is placed at the bottom of a borehole. A heavy slide hammer lbs is dropped repeatedly 30 inches onto the top of the sample tube, driving it into the soil being tested.