Seismic behavior of pile group in soil slope

Mapping Intimacies ◽

10.31224/osf.io/atcsn ◽

2021 ◽

Author(s):

Mehdi Zadehmohamad ◽

Majid Moradi ◽

Abbas Ghalandarzadeh

Keyword(s):

Relative Density ◽

Seismic Behavior ◽

Pile Group ◽

Slope Movement ◽

Shaking Table ◽

Soil Slope ◽

Shaking Table Tests ◽

Pile Groups ◽

Constant Frequency

Seismic behavior of pile group in slope is interested for many years by researchers .Inthis research Shaking table tests were conducted by means of a rigid-box with 1.8m in length,0.8 in width and 1.2 in height in order to investigate the effects of the location of pile group insand slope on its seismic behavior .A cap supported by a pile group was set in a dry sandslope, and subjected to sinusoidal base motion with constant frequency. Soil used in this studywas firoozkuh sand 161 with 60% relative density. The tests were scaled at 1/10th and the pileswere made from aluminum with 95cm in length and they have fixed head condition.Discussions are focused on the behavior of pile groups in different situations. Main interestsare recognition the effect of slope movement and location of pile group on bending behaviorof piles.

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Seismic Response of Pile Groups Improved with Deep Cement mixing Columns in Liquefiable Sand: Shaking Table Tests

Canadian Geotechnical Journal ◽

10.1139/cgj-2020-0505 ◽

2021 ◽

Author(s):

Dingwen Zhang ◽

Anhui Wang ◽

Xuanming Ding

Keyword(s):

Seismic Behavior ◽

Lateral Displacement ◽

Bending Moment ◽

Pile Group ◽

Shaking Table ◽

Excess Pore Pressure ◽

Shaking Table Tests ◽

Pile Groups ◽

Acceleration Response ◽

Table Model

A series of shaking table model tests were performed to examine the effects of deep cement mixing (DCM) columns with different reinforcement depths on the seismic behavior of a pile group in liquefiable sand. Due to the DCM column reinforcement, the fundamental natural frequency of the model ground increases noticeably. The excess pore pressure of soils reduces with the increase of reinforcement depths of the DCM columns. Before liquefaction, the acceleration response of soils in the improved cases is obviously lower than that in the unimproved case, but the acceleration attenuation is greater after liquefaction in the unimproved case. Moreover, the lateral displacement of the superstructure, the settlement of the raft, and the bending moment of the piles in the improved cases are significantly reduced compared to those in the unimproved case, and the reduction ratios rise with the increase of reinforcement depth of the DCM columns. However, reinforcement by the DCM columns may result in the variation of the location of the maximum moment that occurs in the pile.

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THE EFFECT OF PILE GROUP LOCATION IN SLOPE ON ITS SEISMIC BEHAVIOR

10.31224/osf.io/tnyxv ◽

2021 ◽

Author(s):

Mehdi Zadehmohamad ◽

Majid Moradi ◽

Abbas Ghalandarzadeh

Keyword(s):

Seismic Behavior ◽

Pile Group ◽

Shaking Table ◽

Shaking Table Tests ◽

Constant Frequency ◽

Dry Sand

IN THIS RESEARCH SHAKING TABLE TESTS WERE CONDUCTED TO INVESTIGATE THE EFFECTSOF THE LOCATION OF PILE GROUP LOCATION ON ITS SEISMIC BEHAVIOR. A CAP SUPPORTED BY APILE GROUP WAS SET IN A DRY SAND SLOPE, AND SUBJECTED TO SINUSOIDAL BASE MOTIONWITH CONSTANT FREQUENCY. SOIL USED IN THIS STUDY WAS FIROUZKOUH SAND 161 WITH 60%RELATIVE DENSITY.THE TESTS WERE SCALED AT 1/10th AND THE PILES WERE MADE FROMALUMINUM WITH 95cm LENGTH. DISCUSSIONS ARE FOCUSED ON THE BEHAVIOR OF PILE GROUPIN DIFFERENT SITUATION.

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