Liquefaction Mitigation of Sand Deposits by Granular Piles- an Overview

Application of Effective Stress Model to Analysis of Liquefaction and Seismic Performance of an Earth Dam in China

“…Figure 6 indicates that negative excess pore pressure ratio developed in the upper part of the saturated gravelly filling, which means a decrease of pore pressure and increase of effective stress. This phenomenon coincides with the dynamic behavior research of moderate dense granular material with low confining stress [26]. The increase of effective stress prevents the occurrence of potential liquefaction in this range.…”

A Systematic Review of the Relationship between Geotechnics and Disasters

“…Scientific production peaked in 2008 (Figure 3) since most of the publications (129 documents) corresponded to the "Geotechnical Engineering for Disaster Mitigation and Rehabilitation-Proceedings of the 2ND International" conference. Other topics of interest studied that year were liquefaction [202,203,302], earth- For this systematic analysis, we considered the keywords used in the search "Disaster" and "Geotechnics", documents published in the last two decades (2011-2021), documents with more than five citations, documents written in English, and the analysis of case studies, obtaining 32 publications. From these results, a summary graph of the topics, triggering factors, and applied methodologies was constructed, where the investigations could be classified into six groups (Table 3): (i) "geological hazard, soil erosion, soil freeze, and coastal area", where research focused on stability on steep slopes, soil erosion due to construction in expansive soils, design criteria in the process of rehabilitation and reconstruction after seismic and tsunami hazards, and analysis of characteristics and mechanisms in road freezing; (ii) "earthquakes", where investigations examined the analysis of structural damage in foundations, damage after the Wenchuan earthquake, earthquake disaster waste, and the use of wireless sensors for structural monitoring due to seismic risk; (iii) "liquefaction", where topics dealt with liquefaction related to earthquakes, injection of bubbles into sandy ground to reduce the degree of saturation, liquefactioninduced permanent deformations, numerical simulations of liquefaction, and damage to dikes after earthquakes and aftershocks; (iv) "inappropriate analysis model", where topics focused on the application of finite elements for the study of soil improvement using the bamboo pile-mattress system, and geosynthetics in embankments and roads to replace fill material and reduce the load applied to foundations; (v) "landslides", which included topics around landslide vulnerability, numerical simulations, and laboratory tests applied to landslide and subsidence studies; and (vi) "mining disasters", which considered publications on rupture mechanisms in mining areas, faults.…”

“…Liquefaction susceptibility mapping [145], triaxial test setup with a little modification to the triaxial cell [202], injecting air bubbles into sandy ground [301], rammed granular piles (RGP) [302], systematic research, MASW, piezometers [303], high-resolution satellite images, electromagnetic and electrical resistivity methods [251].…”

Evaluating the efficiency of stone columns in mitigating liquefaction risks and enhancing soil bearing capacity: A case study

“…Unlike a drain, the stone column is made of a highly permeable compacted gravel material. Its high capacity to evacuate pore pressures results from its high permeability, and also the appearance during the earthquake of a strong hydraulic gradient, linked to the phenomenon of dilatancy of the gravel of the columns [12]. To assess the risk reduction of the liquefaction potential, we used the method of Seed and Booker [13] which is based on the dissipation of excess pore pressure [14].…”