Reliability-based design of ground improvement for liquefaction mitigation

2008 ◽  
Vol 30 (3) ◽  
pp. 200-216 ◽  
Author(s):  
Shin-ichi Nishimura ◽  
Hideyoshi Shimizu
Keyword(s):  
Ground Improvement ◽  
Liquefaction Mitigation ◽  
Reliability Based Design

A Study into Resin Injection as a Ground Improvement Technique for Seismic Liquefaction Mitigation

2018 ◽  
Author(s):  
Nick J. Traylen ◽  
Frederick J. Wentz ◽  
Sjoerd Van Ballegooy ◽  
Liam M. Wotherspoon ◽  
Theo Hnat ◽  
...  
Keyword(s):  
Ground Improvement ◽  
Seismic Liquefaction ◽  
Liquefaction Mitigation ◽  
Resin Injection

Mitigation of Liquefaction Hazard Using Granular Piles

2011 ◽  
Vol 2 (1) ◽  
pp. 44-66 ◽  
Author(s):  
A. Murali Krishna
Keyword(s):  
Ground Improvement ◽  
Stone Columns ◽  
Loose Sand ◽  
Short Discussion ◽  
Remedial Measure ◽  
Design Concepts ◽  
Liquefaction Mitigation ◽  
Liquefaction Hazard ◽  
Granular Piles ◽  
Surrounding Soil

In this paper, ground improvement techniques are used to mitigate liquefaction hazards. Granular piles are the preferred alternative due to several advantages. Granular piles improve the ground by reinforcing and adding density to the surrounding soil apart from providing drainage. Different mechanisms operate in the function of stone columns/granular piles in liquefaction mitigation, including Drainage, Storage, Dilation, Densification, and Reinforcement. This paper presents an overview of the use of granular piles as a liquefaction remedial measure for sand deposits. A brief description on liquefaction and the associated features is presented. A short discussion on various ground improvement methods available for liquefaction mitigation is discussed in light of the importance of granular piles. Different installation methods and design concepts for granular piles are presented. Various mechanisms of granular piles in mitigating the liquefaction potential of loose sand deposits are discussed and quantified in detail proving their effectiveness in hazard mitigation.

Numerical study on ground improvement for liquefaction mitigation using stone columns encased with geosynthetics

2015 ◽  
Vol 43 (2) ◽  
pp. 190-195 ◽  
Author(s):  
Liang Tang ◽  
Shengyi Cong ◽  
Xianzhang Ling ◽  
Jinchi Lu ◽  
Ahmed Elgamal
Keyword(s):  
Numerical Study ◽  
Ground Improvement ◽  
Stone Columns ◽  
Liquefaction Mitigation

scholarly journals Effect of Deep Mixing Grid Spacing On The Settlement of Liquefied Soil, Using Numerical Approach

2022 ◽  
Author(s):  
Fereshteh Rahmani ◽  
Seyed Mahdi Hosseini
Keyword(s):  
Pore Pressure ◽  
Ground Improvement ◽  
Pressure Ratio ◽  
Soil Layer ◽  
Excess Pore Pressure ◽  
Analysis Model ◽  
Liquefaction Mitigation ◽  
Deep Mixing ◽  
Liquefiable Soil ◽  
Excess Pore

Abstract Liquefaction occurs in a loose and saturated sand layer, induces quite large damages to infrastructures, the importance of liquefaction mitigation has been emphasized to minimize earthquake disasters for many years. Many kinds of ground improvement techniques based on various improvement principles have been developed for liquefaction mitigation. Among them, deep mixing method with grid pattern was developed for liquefaction mitigation in the 1990s, where the grid of stabilized column walls functions to restrict the generation of excess pore pressure by confining the soil particle movement during earthquake. In this study, a parametric study of the grid-form deep mixing wall is performed using numerical modeling with GID+OpenSees interface V2.6.0. The finite element method with a three-dimensional analysis model can be used to estimate the foundation settlement over liquefiable soil layer. The validity of the developed model was evaluated by comparing the results obtained from the model with the results of numerical studies and the experimental centrifuge test to investigate the effect of deep mixing grid wall on the settlement and generation of excess pore pressure ratio of liquefiable soil. Based on the analysis, the settlement for improved soil was 69% smaller than the settlement for unimproved soil. The results also indicated that the grid wall space, relative density, and stiffness ratio between soil-cement columns and enclosed soil plays an important role in the occurrence of liquefaction and volumetric strains.

Mitigation of Liquefaction Hazard Using Granular Piles

2018 ◽  
pp. 86-116
Author(s):  
A. Murali Krishna
Keyword(s):  
Ground Improvement ◽  
Stone Columns ◽  
Loose Sand ◽  
Short Discussion ◽  
Liquefaction Potential ◽  
Design Concepts ◽  
Liquefaction Mitigation ◽  
Liquefaction Hazard ◽  
The World ◽  
Granular Piles

Ground improvement techniques are employed to mitigate liquefaction hazards. Granular piles are the most widely preferred alternative all over the world, due to several advantages associated with them. Different mechanisms operate in the function of stone columns/granular piles in liquefaction mitigation like drainage, storage, dilation, densification, and reinforcement. This chapter presents an overview of the use of granular piles as a liquefaction remedial measure for sand deposits. A brief description on the phenomenon of liquefaction and the associated features has been presented. A short discussion on various ground improvement methods available for liquefaction mitigation is presented in light of importance of granular piles. Different installation methods and design concepts for granular piles are presented. Various mechanisms of granular piles in mitigating the liquefaction potential of loose sand deposits are discussed and quantified in detail proving their effectiveness in hazard mitigation.

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