Estimating free field seismic settlement history in a saturated layered soil profile

2021 ◽  
Vol 150 ◽  
pp. 106937
Author(s):  
Nima Mojtahedzadeh ◽  
Raj Siddharthan
Keyword(s):  
Soil Profile ◽  
Free Field ◽  
Layered Soil ◽  
Settlement History

Sensitivity analysis of geotechnical site conditions effect on the seismic response of a saturated inhomogeneous poroviscoelastic soil profile

2018 ◽  
Vol 15 (6) ◽  
pp. 661-677 ◽  
Author(s):  
Toufiq Ouzandja ◽  
Mohamed Hadid
Keyword(s):  
Soil Properties ◽  
Seismic Response ◽  
Pore Water ◽  
Soil Profile ◽  
Water Saturation ◽  
Free Field ◽  
Response Spectra ◽  
Response Analysis ◽  
Content Type ◽  
Linear And Nonlinear

Purpose This paper aims to present the investigation of the linear and nonlinear seismic site response of a saturated inhomogeneous poroviscoelastic soil profile for different soil properties, such as pore-water saturation, non-cohesive fines content FC, permeability k, porosity n and coefficient of uniformity Cu. Design/methodology/approach The inhomogeneous soil profile is idealized as a multi-layered saturated poroviscoelastic medium and is characterized by the Biot’s theory, with a shear modulus varying continuously with depth according to the Wichtmann’s model. Seismic response analysis has been evaluated through a computational model, which is based on the exact stiffness matrix method formulated in the frequency domain assuming that the incoming seismic waves consist of inclined P-SV waves. Findings Unlike the horizontal seismic response, the results indicate that the vertical one is strongly affected by the pore water saturation. Moreover, in the case of fully saturated soil profile, the same vertical response spectra are found for the two cases of soil behavior, linear and nonlinear. Originality/value This research is a detailed study of the geotechnical soil properties effect on the bi-directional seismic response of saturated inhomogeneous poroviscoelastic soil profile, which has not been treated before; the results are presented in terms of the peak acceleration ratio, as well as the free-field response spectra and the spectral ratio (V/H).

Experimental Validation of an Identification Procedure of Soil Profile Characteristics from Free Field Acceleration Records

2012 ◽  
Vol 3 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Z. Harichane ◽  
H. Afra ◽  
R. Bahar
Keyword(s):  
Soil Profile ◽  
Damping Ratio ◽  
Linear Optimization ◽  
Free Field ◽  
Unit Weight ◽  
New Approach ◽  
Theoretical Function ◽  
Minimization Technique ◽  
Profile Characteristics

In this paper, a new approach for soil profile characterization is validated. The soil characteristics are calculated by fitting the theoretical amplification functions to those obtained experimentally. The identified characteristics have been observed to agree well with those obtained by in situ and laboratory tests. This new approach uses system identification theory and free field records. It is based on formulation of theoretical soil amplification function for two sites in terms of the different parameters of the soil profile layers (thickness, damping ratio, shear wave velocity and unit weight). The theoretical function is smoothed according to the experimental data (spectral ratios) by means of the least squares minimization technique. The function parameters are determined by solving, numerically, a non linear optimization problem. In this approach, soil profile characteristics of two sites can be identified simultaneously, from only a single soil acceleration record at free surface of each site without need of bedrock or outcropping acceleration records. Strong ground motions data recorded during the Boumerdes earthquake (Algeria) of May 21, 2003, are used for the validation.

Centrifuge Testing on Suction Anchors: Double-Wall, Over-Consolidated Clay, and Layered Soil Profile

2006 ◽  
Author(s):  
P. Jeanjean ◽  
D. Znidarcic ◽  
R. Phillips ◽  
H. -Y. Ko ◽  
S. Pfister ◽  
...  
Keyword(s):  
Soil Profile ◽  
Layered Soil ◽  
Centrifuge Testing ◽  
Double Wall

Simulation of carrier-facilitated transport of phenanthrene in a layered soil profile

2002 ◽  
Vol 56 (3-4) ◽  
pp. 209-225 ◽  
Author(s):  
Alexander Prechtel ◽  
Peter Knabner ◽  
Eckhard Schneid ◽  
Kai Uwe Totsche
Keyword(s):  
Soil Profile ◽  
Facilitated Transport ◽  
Layered Soil

A Simple Approach for Estimating the First Resonance Peak of Layered Soil Profiles

2018 ◽  
Vol 12 (01) ◽  
pp. 1850005 ◽  
Author(s):  
Haizhong Zhang ◽  
Yan-Gang Zhao
Keyword(s):  
Soil Profile ◽  
Single Layer ◽  
Resonance Peak ◽  
Layered Soil ◽  
Soil Profiles ◽  
Simple Method ◽  
Amplification Ratio ◽  
Local Site ◽  
The One ◽  
Input Motion

The first resonance peak, Gs1, represents the amplification ratio of seismic motion when resonance between input motion and the local site occurs. The Gs1 is important for understanding amplification characteristics of local site, thus it has been adopted for evaluating site effects in the Japanese Seismic Code. Herein, a simple method for estimating the Gs1 of layered soil profiles is proposed. By replacing a multi-layer soil profile on bedrock with an equivalent one-layer soil profile, the Gs1 and fundamental period are easily obtained. To realize the one-layer profile, we develop a procedure to replace a two-layer soil profile on bedrock with an equivalent single-layer profile. This procedure is then applied successively to a multi-layer soil profile to obtain an equivalent single-layer soil profile. The validity of the proposed method is demonstrated by evaluating 67 representative sites. The results obtained using the proposed procedure agree well with those produced by the wave propagation method.

Inelastic Seismic Response of Extended Pile-Shaft-Supported Bridge Structures

2004 ◽  
Vol 20 (4) ◽  
pp. 1057-1080 ◽  
Author(s):  
T. C. Hutchinson ◽  
Y. H. Chai ◽  
R. W. Boulanger ◽  
I. M. Idriss
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Performance Measures ◽  
Soil Profile ◽  
Site Response ◽  
Free Field ◽  
Winkler Foundation ◽  
Dynamic Analyses ◽  
Inelastic Seismic Response ◽  
Motion Characteristics

Nonlinear static and dynamic analyses were used to evaluate the inelastic seismic response of bridge and viaduct structures supported on extended cast-in-drilled-hole (CIDH) pile shafts. The nonlinear dynamic analyses used a beam-on-nonlinear-Winkler foundation (BNWF) framework to model the soil-pile interaction, nonlinear fiber beam-column elements to model the reinforced concrete sections, and one-dimensional site response analyses for the free-field soil profile response. The study included consideration of ground motion characteristics, site response, lateral soil resistance, structural parameters, geometric nonlinearity (P-Δ effects), and performance measures. Results described herein focus on how the ground motion characteristics and variations in structural configurations affect the performance measures important for evaluating the inelastic seismic response of these structures. Presented results focus on a representative dense soil profile and thus are not widely applicable to dramatically different soil sites.

scholarly journals Uncertainty and sensitivity analysis of water transport modelling in a layered soil profile using fuzzy set theory

1999 ◽  
Vol 1 (2) ◽  
pp. 127-138 ◽  
Author(s):  
Karsten Schulz ◽  
Bernd Huwe
Keyword(s):  
Boundary Conditions ◽  
Water Flow ◽  
Set Theory ◽  
Fuzzy Set ◽  
Fuzzy Set Theory ◽  
Soil Profile ◽  
Closed Form Solution ◽  
Form Solution ◽  
Layered Soil ◽  
Transport Modelling

A methodology based on fuzzy set theory is presented to express imprecision of input data in a non-probabilitic sense. Imprecision may originate from indirect measurements, estimation routines, subjective interpretation, and expert judgement of available information. A numerical finite difference solution scheme was chosen to solve one-dimensional steady-state water flow in the unsaturated zone of a layered soil profile. To extend the solution algorithm to operate with fuzzy soil-hydraulic properties and boundary conditions, it is necessary to incorporate the scheme into a nonlinear optimisation routine from where resulting membership functions of soil water pressures with depths can be calculated. By subsequently considering the different imprecise parameters in the calculations and analysing their impact, it is concluded that resulting imprecision not only depends on the degree of imprecision and the number of uncertain parameters but also very much on the system context (e.g. boundary conditions and spatial distribution). The comparison with a closed form solution to solve the fuzzy water flow problem show the potential of that method to be extended towards transient, two- and three-dimensional process descriptions.

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