摘要：Rubble-mound foundations are commonly used in port-channel engineering and protection embankment. Heavy tamping is usually used to attain the required total compactness and bear capacity of such foundations. Monitoring and controlling the tamping-impact stresses is difficult because of the noncontinuous nature of the medium, particularly under the high impulse conditions (e.g. large-scale stresses and rapid attenuation) of the tamping process. In this research, a new instrument for measuring tamping stress incorporating a wide stress range and high sampling frequency was designed for use underwater and under dry conditions. Effects of different monitoring device radii were investigated by analyzing the tamping stresses obtained with different heavy-hammer falling distances. Results indicated that the monitoring device with a larger radius provided more stable test outcomes. We further verified the feasibility of the proposed monitoring device for monitoring heavy-hammer tamping stress. Testing data demonstrated that the dynamic-load monitoring instrument can achieve tamping stress values under heavy-hammer tamping under dry and wet conditions. The instrument also followed the same rule in accordance with compactness and settlement, thereby proving that the technique can be used to determine the foundation-bearing capacity.
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