A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Generation and Dissipation of Pore Water Pressures During Soil Liquefaction
An analytical procedure is presented for evaluating the general characteristics of pore water pressure build-up and subsequent dissipation in sand deposits both during the following a period of earthquake shaking. It is shown that in layers of fine sand, excessive hydrostatic pressures may persist for an hour or more after an earthquake. However evidence of sub-surface liquefaction may not appear at the ground surface until several minutes after the shaking has stopped and the critical condition at the ground surface may not develop until 10 to 30 minutes after the earthquake. On the other hand, for coarse sands and gravels with no impedance of drainage due to the presence of sand seams or layers, pore pressures generated by earthquake shaking may dissipate so rapidly that no detrimental build-up of pore pressure or a condition approching liquefaction can develop. Improving the drainage capability of a sand deposit by the installation of a highly pervious continuous drainage system may thus provide an effective means of stabilizing a potentially unstable deposit. Analyses of the type described also provide the means for assessing whether sub-surface liquefaction will have any serious effects on structures supported near the ground surface.
The Generation and Dissipation of Pore Water Pressures During Soil Liquefaction
An analytical procedure is presented for evaluating the general characteristics of pore water pressure build-up and subsequent dissipation in sand deposits both during the following a period of earthquake shaking. It is shown that in layers of fine sand, excessive hydrostatic pressures may persist for an hour or more after an earthquake. However evidence of sub-surface liquefaction may not appear at the ground surface until several minutes after the shaking has stopped and the critical condition at the ground surface may not develop until 10 to 30 minutes after the earthquake. On the other hand, for coarse sands and gravels with no impedance of drainage due to the presence of sand seams or layers, pore pressures generated by earthquake shaking may dissipate so rapidly that no detrimental build-up of pore pressure or a condition approching liquefaction can develop. Improving the drainage capability of a sand deposit by the installation of a highly pervious continuous drainage system may thus provide an effective means of stabilizing a potentially unstable deposit. Analyses of the type described also provide the means for assessing whether sub-surface liquefaction will have any serious effects on structures supported near the ground surface.
The Generation and Dissipation of Pore Water Pressures During Soil Liquefaction
H. B. Seed (author) / P. P. Martin (author) / J. Lysmer (author)
1975
47 pages
Report
No indication
English
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