DEADMAN ANCHORAGES IN VARIOUS SOIL MEDIUMS
Final technical rept. Sep 1962-Mar 1965
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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A test program was conducted to investigate deadman anchorage holding capacities under applied horizontal loads. Deadmen fabricated of concrete and ranging in face area from 5 to 72 square feet were tested in depths of embedment from ground level to 7 feet. The deadmen were pulled both singly and in groups of three, in sand and in two soils with cohesive characteristics. The test program also included tests on a model scale. The applied load versus horizontal displacement relationship exhibited a basic recognizable form for all conditions of tests. By graphic analysis, a series of reaction-pattern curves was developed relating deadman holding power in each cohesive soil to three factors deadman face area, depth of embedment, and whether the deadmen were embedded singly or in a group. The investigation disclosed that multiple anchors develop a higher holding capacity per net area than a single deadman with the same total face area. The increase in holding capacity ranging from 5 to 20 depends upon such factors as depth of embedment, the type of soil, and the spacing between deadmen. Under most test conditions, up to 30 increase in holding capacities was attained in cohesive soils as compared to sand, but 2 to 3 times the horizontal displacement was required to achieve the maximum holding capacity.
- Structural Engineering and Building Technology