Investigating the au-compacted in-situ characteristics and dynamic behavior of the compacted specimen of collapsible fine-grained ML soil

Document Type : Original Article

Author
Ata AghaeiAraei
Associate Professor, Road, Housing and Urban Development Research Center, Tehran, Iran
10.22034/road.2024.429534.2228
Abstract
This paper presented the field characteristics of ML soil prone to collapsible in uncompact condition, using soil mechanics tests and in-situ tests including determination of electrical resistance and wave velocities, and then the dynamic and post-cyclic monotonic behavior of the compact specimen using a large-scale triaxial device. The average electrical resistance of the collapsible ML soil layer of is reduced to a third (11 Volt-Meter/Ampere) from the surface to the depth of 4 m and is almost constant up to the depth of 30 m. However, the values of the shear wave velocity "average from the surface" of the downhole method have a low value (i.e. 160 m/s) at the surface depth and gradually increase to 450 m/s at a depth of 30 m. In the following, on the mentioned compacted materials under σ_3^'equal to 1, 2 and 5〖kg/cm〗^2, dynamic cyclic tests were performed according to ASTM D3999 under frequencies of 0.5, 1, 2, 5 and 10 Hz. The effect of changing the percentage of moisture and anisotropic consolidation (σ_1^'/σ_3^'), triangular, sinusoidal and rectangular waveforms on the results of shear modulus (G), shear modulus ratio (G/G_max) and damping ratio (D) versus strain shear (γ) was investigated through 57 tests. The results showed that with the increase of loading frequency the values of G and D are increased slightly and considerably, respectively. According to the results, compaction solution alone is not suitable for treatment of the studied soil.
Keywords
ML Soil
Shear Modulus
Damping Ratio
Post-Cyclic Monotonic
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