A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Although Rhode Island is not considered to be a region of high seismicity, by code the liquefaction potential of soil during an earthquake must still be considered in the design of certain highway structures. There is some debate in local engineering practice whether the silty soils that are commonly encountered in Rhode Island are susceptible to liquefaction. These soils are typically characterized as either inorganic silts or organic silts and are sometimes found in a loose condition in the field. The current standard of practice for evaluating liquefaction potential uses in situ tests such as the standard penetration test and engineering correlations, which were developed primarily from tests in sands. Because of this, there is still considerable uncertainty about the dynamic behavior of the Rhode Island silts. This report presents a laboratory study on the liquefaction potential of silts from Rhode Island. This study included a field sampling program consisting of piston and block sampling and an assessment of sample disturbance. It was not possible to obtain high quality samples of either the inorganic or organic silts using either commonly used drilling and sampling techniques or a state-of-the-art piston sampler. A modified moist tamping method was developed to reconstitute sample of inorganic silt for cyclic triaxial testing, and it is shown that the results of the reconstituted samples of inorganic silt for cyclic triaxial testing, and it is shown that the results of the reconstituted samples compare well to the block samples prepared from a slurry. It is believed that the modified moist tamping method captures the in situ fabric of the silt and can be used in place of undisturbed samples for estimating the onset of liquefaction of these soils.
Although Rhode Island is not considered to be a region of high seismicity, by code the liquefaction potential of soil during an earthquake must still be considered in the design of certain highway structures. There is some debate in local engineering practice whether the silty soils that are commonly encountered in Rhode Island are susceptible to liquefaction. These soils are typically characterized as either inorganic silts or organic silts and are sometimes found in a loose condition in the field. The current standard of practice for evaluating liquefaction potential uses in situ tests such as the standard penetration test and engineering correlations, which were developed primarily from tests in sands. Because of this, there is still considerable uncertainty about the dynamic behavior of the Rhode Island silts. This report presents a laboratory study on the liquefaction potential of silts from Rhode Island. This study included a field sampling program consisting of piston and block sampling and an assessment of sample disturbance. It was not possible to obtain high quality samples of either the inorganic or organic silts using either commonly used drilling and sampling techniques or a state-of-the-art piston sampler. A modified moist tamping method was developed to reconstitute sample of inorganic silt for cyclic triaxial testing, and it is shown that the results of the reconstituted samples of inorganic silt for cyclic triaxial testing, and it is shown that the results of the reconstituted samples compare well to the block samples prepared from a slurry. It is believed that the modified moist tamping method captures the in situ fabric of the silt and can be used in place of undisturbed samples for estimating the onset of liquefaction of these soils.
Liquefaction Potential of Inorganic and Organic Silts
C. Baxter (author)
2008
47 pages
Report
No indication
English
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