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A Centrifuge Study of the Influence of Dense Granular Columns on the Performance of Gently Sloping Liquefiable Sites
Dense granular columns are commonly used to reduce the risk of liquefaction or its associated ground deformations in gentle slopes through: 1) enhancing drainage; 2) providing shear reinforcement; and 3) densifying and increasing lateral stresses in the surrounding soil during installation. However, the independent influence and contribution of these mitigation mechanisms on excess pore pressures, accelerations, and lateral and vertical deformations is not sufficiently understood to facilitate reliable design. This paper presents the results of a series of dynamic centrifuge tests to evaluate the influence of dense granular columns on the seismic performance of gentle slopes (e.g. <5%). Granular columns with greater area replacement ratios (Ar about 20%) were shown to be highly effective in reducing seismic settlement and lateral slope deformations, owing primarily to expedited dissipation of excess pore water pressures rather than shear reinforcement. The influence of granular columns on accelerations in the surrounding soil depended on the column’s Ar and drainage capacity. The insight from these experiments aims to improve our understanding of the mechanics of liquefaction and lateral spreading mitigation with granular columns.
A Centrifuge Study of the Influence of Dense Granular Columns on the Performance of Gently Sloping Liquefiable Sites
Dense granular columns are commonly used to reduce the risk of liquefaction or its associated ground deformations in gentle slopes through: 1) enhancing drainage; 2) providing shear reinforcement; and 3) densifying and increasing lateral stresses in the surrounding soil during installation. However, the independent influence and contribution of these mitigation mechanisms on excess pore pressures, accelerations, and lateral and vertical deformations is not sufficiently understood to facilitate reliable design. This paper presents the results of a series of dynamic centrifuge tests to evaluate the influence of dense granular columns on the seismic performance of gentle slopes (e.g. <5%). Granular columns with greater area replacement ratios (Ar about 20%) were shown to be highly effective in reducing seismic settlement and lateral slope deformations, owing primarily to expedited dissipation of excess pore water pressures rather than shear reinforcement. The influence of granular columns on accelerations in the surrounding soil depended on the column’s Ar and drainage capacity. The insight from these experiments aims to improve our understanding of the mechanics of liquefaction and lateral spreading mitigation with granular columns.
A Centrifuge Study of the Influence of Dense Granular Columns on the Performance of Gently Sloping Liquefiable Sites
Badanagki, Mahir (author) / Dashti, Shideh (author) / Kirkwood, Peter (author)
Geotechnical Earthquake Engineering and Soil Dynamics V ; 2018 ; Austin, Texas
2018-06-07
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2018
Influence of Dense Granular Columns on the Performance of Level and Gently Sloping Liquefiable Sites
| British Library Online Contents | 2018
| British Library Online Contents | 2018
| British Library Online Contents | 2018