Loading Rate Effects on the One-Dimensional Compressibility of Four Partially Saturated Soils

摘要: Abstract : The one-dimensional or uniaxial strain response of most soils subjected to high-intensity transient loads differs from the measured under static conditions. As time peak pressure decreases, exhibit a stiffening stress-strain response. That is usually referred as loading rate effect. Some researchers have suggested that, approaches submillisecond range, an increase up fivefold in modulus occurs. Other shown no effects for soil An explosive-loaded test device was modified and used this study obtain times laboratory. results obtained were supplemented with those existing state-of-the-art measurements rise ranging submilliseconds minutes. Test at pressures typically on order 10,000 psi (69 MPa) rates 100 percent/ msec four soils--two clean sands, clayey sand, silty clay. These showed that drastic did not occur sumbillisecond range. Instead, gradual occurred. maximum ratio dynamic-to-static approximately 2. Based upon these results, strain-rate strain-level dependent model developed.