6th Ishihara lecture: Simplified procedure for estimating liquefaction-induced building settlement

Bray, Jonathan D.; Macedo, Jorge

doi:10.1016/j.soildyn.2017.08.026

Cited by 133 publications

(65 citation statements)

References 33 publications

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“…Shahir et al [13] numerically studied the correlations between the settlement of shallow, rigid box structures and their dimensions of the surrounding densified ground. Bray and Macedo [14] developed a 2-D, linear-elastic model to predict the influence of several parameters on settlement and characterized that influence in the model. Karimi et al [15] presented results from a comprehensive numerical parametric study of soil foundation structure systems on layered liquefiable deposits.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mitigations of Seismic Settlement and Tilting of Structures by Adopting Improved Soil Slab and Soil Mixing Walls

Zhang

Chen

2018

Sustainability

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Settlement of surface structures due to subsoil liquefaction is a big issue in geotechnical engineering. It has been happening during earthquakes in liquefaction-prone areas for many years. Mitigations have been proposed for this problem. The improved soil slabs and vertical mixing soil walls combined with lowering ground water levels (GWLs) were proposed in this study. Experiments were carried out by adopting a 1-g shaking table test. Two different soil densities with uniform and eccentric loads were included. Combined with lowering GWLs, three different soil slabs with a length of 40, 60 and 80 cm and two different mixing walls with soil and plastic were studied and compared. Results show that the horizontal soil slabs have good performance to reduce the settlement of structures. On the other hand, the vertical soil mixing walls did not reduce the settlement effectively, but its performance could be improved by lowering of GWLs.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Mitigations of Seismic Settlement and Tilting of Structures by Adopting Improved Soil Slab and Soil Mixing Walls

Zhang

Chen

2018

Sustainability

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“…The careful documentation of liquefaction following the 1999 Kocaeli earthquake (Bray and Stewart, 2000) provided much of the data that advanced the profession's understanding of liquefaction of fine-grained soils and led to important new criteria for evaluating the liquefaction susceptibility of these soils (e.g., Bray and Sancio, 2006). Similarly, the documenting of liquefaction following the Canterbury earthquake sequence has yielded new insights into the settlement of structures on liquefied soils and procedures to evaluate them (Bray and Macedo, 2017). If the geotechnical engineering profession does not continue to look for new insights following future earthquakes with more extensive data sets, important research opportunities will be lost.…”

Section: Figure | Number Of Geer Responses Bymentioning

confidence: 99%

Recent Advances in Geotechnical Post-earthquake Reconnaissance

Bray

Frost

Rathje

et al. 2019

Front. Built Environ.

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Field observations are particularly important in geotechnical engineering, because it is difficult to replicate in the laboratory the response of soil deposits built by nature over thousands of years. Detailed mapping of damaged and undamaged areas provides the data for the well-documented case histories that drive the development of many current design procedures. Thus, documenting key insights from earthquakes advance research and practice. This has been a primary goal of the National Science Foundation-sponsored Geotechnical Extreme Events Reconnaissance (GEER) Association since its inception almost 20 years ago. New technologies are continually employed by GEER teams to capture ground deformation and its effects. These technologies include Light Imaging Detection and Ranging (LIDAR) and Structure-from-Motion (SfM) image processing techniques for generating and visualizing three-dimensional point cloud data sets. New sensor deployment platforms such as Unmanned Aerial Vehicles (UAVs) are playing an integral role in the data collection process. Unanticipated observations from major events often catalyze new research directions. An overview of some of these recent integrated technology deployments and their role at the core of earthquake disaster analysis is presented. Important advancements are possible through post-event research if their effects are captured and shared effectively.

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“…With limited drainage, pore pressure may equalize the total overburden stress and reduce the effective stresses o a point at which the sand matrix loses its shear resistance and starts behaving like a viscous fluid (Wang et al 2019). Even without reaching such an extreme condition, the reduction of effective stresses below buildings may cause noticeable displacements and, eventually, a reduction of the bearing capacity of the foundation (e.g., Bray and Macedo 2017;Modoni et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Experimental Evidence of the Effectiveness and Applicability of Colloidal Nanosilica Grouting for Liquefaction Mitigation

Salvatore

Modoni

Mascolo

et al. 2020

J. Geotech. Geoenviron. Eng.

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The low viscosity and the ability to control solidification rate make colloidal nanosilica grout an excellent ground-improvement solution which is functional for different engineering purposes. A comprehensive experimental programme was performed to test the effectiveness and applicability of low-pressure injection of aqueous nanosilica suspensions against seismic liquefaction and to provide the experimental basis for the design, execution, and control of treatments. Scanning electron microscope and X-ray diffraction tests carried out on samples prepared with variable dosages enabled analysis of the microstructure of the original material and grouted sand. The influence of the grout composition on the solidification rate, viscosity, and shear strength of the treated sand was evaluated with preliminary tests to optimize the use of material. The efficacy of treatment in terms of stress-strain response and liquefaction resistance was investigated with a series of drained monotonic and undrained cyclic triaxial tests. A quality control procedure based on sonic wave transmission was established by performing bender element tests on samples cured for different times. The intent was to find the trade-off between a cost-effective use of materials and the mechanical performance of the treated sand.

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6th Ishihara lecture: Simplified procedure for estimating liquefaction-induced building settlement

Cited by 133 publications

References 33 publications

Experimental Study on Mitigations of Seismic Settlement and Tilting of Structures by Adopting Improved Soil Slab and Soil Mixing Walls

Experimental Study on Mitigations of Seismic Settlement and Tilting of Structures by Adopting Improved Soil Slab and Soil Mixing Walls

Recent Advances in Geotechnical Post-earthquake Reconnaissance

Experimental Evidence of the Effectiveness and Applicability of Colloidal Nanosilica Grouting for Liquefaction Mitigation

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