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https://hdl.handle.net/11681/27727| Title: | Penetration resistance of soils. Report 1, Tests with circular footings on air-dry sands |
| Authors: | Green, A. J. (Andrew J.) |
| Keywords: | Soil penetration test Soil mechanics Sand Concrete footings |
| Publisher: | Mobility and Environmental Systems Laboratory (U.S.) U.S. Army Engineer Waterways Experiment Station. |
| Series/Report no.: | Technical Report (U.S. Army Engineer Waterways Experiment Station) ; M-70-14 rept.1 |
| Abstract: | The study reported herein is an analysis of the penetration of circular plates and smooth-walled and rough-walled cylinders in two sands, each prepared at three strength levels. The penetration elements ranged from 2.5 to 61 cm in diameter, and the speed of penetration in all tests was 2.5 mm/sec. No basic differences were found in the shape of the penetration resistance curves for plates and cylinders, and the forces on the base of the cylinders were only slightly higher than those on the plates. The forces due to friction on the sidewalls of the cylinders were greater for the rough-walled cylinders than for the smooth, as could be. expected, but they did not vary systematically with sand density in either. case. Collapse of the data into a single function for sand was achieved by plotting a dimensionless pressure parameter P/γd versus a penetration parameter z/d. This gave evidence that pressure-sinkage relations, and thus bearing capacity, of large footings can be predicted from model tests. Dimensionless scaling relations and theoretical equations that include a friction angle term were also found to predict bearing capacity, but the problems in measuring a true friction angle make the use of these relations questionable for this purpose. The tests were deemed successful and eliminated irregularities encountered in the results of routine tests. The data should also be of great value in investigations of depth factors for bearing capacity of sand. This report will be supplemented by a report on similar tests in clay. |
| Description: | Technical Report |
| Gov't Doc #: | Technical Report M-70-14 Rept.1 |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | http://hdl.handle.net/11681/27727 |
| Size: | 83 pages/5.463 Mb |
| Types of Materials: | PDF/A |
| Appears in Collections: | Technical Report |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| TR M-70-14 Report 1.pdf | 5.59 MB | Adobe PDF |  View/Open |