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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2014, Vol. 8 Issue (3) : 292-307    https://doi.org/10.1007/s11709-014-0256-8
CASE STUDY
Liquefaction assessment using microtremor measurement, conventional method and artificial neural network (Case study: Babol, Iran)
Sadegh REZAEI(), Asskar Janalizadeh CHOOBBASTI
Department of Civil Engineering, Babol University of Technology, Babol P.O. Box 484, Iran
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Abstract

Recent researchers have discovered microtremor applications for evaluating the liquefaction potential. Microtremor measurement is a fast, applicable and cost-effective method with extensive applications. In the present research the liquefaction potential has been reviewed by utilization of microtremor measurement results in Babol city. For this purpose microtremor measurements were performed at 60 measurement stations and the data were analyzed by suing Nakmaura’s method. By using the fundamental frequency and amplification factor, the value of vulnerability index (Kg) was calculated and the liquefaction potential has been evaluated. To control the accuracy of this method, its output has been compared with the results of Seed and Idriss [1] method in 30 excavated boreholes within the study area. Also, the results obtained by the artificial neural network (ANN) were compared with microtremor measurement. Regarding the results of these three methods, it was concluded that the threshold value of liquefaction potential is Kg=5. On the basis of the analysis performed in this research it is concluded that microtremors have the capability of assessing the liquefaction potential with desirable accuracy.

Keywords liquefaction      microtremor      vulnerability index      artificial neural networks (ANN)      microzonation     
Corresponding Author(s): Sadegh REZAEI   
Online First Date: 25 July 2014    Issue Date: 19 August 2014
 Cite this article:   
Sadegh REZAEI,Asskar Janalizadeh CHOOBBASTI. Liquefaction assessment using microtremor measurement, conventional method and artificial neural network (Case study: Babol, Iran)[J]. Front. Struct. Civ. Eng., 2014, 8(3): 292-307.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-014-0256-8
https://academic.hep.com.cn/fsce/EN/Y2014/V8/I3/292
fault name distance to study area/km fault length/km fault mechanism
Firooz Abad 85 112 thrust fault
Alborz 44 300 thrust fault
Khazar 16 550 thrust fault
Attari 91 85 thrust fault
Astane 93 75 thrust fault
Garmsar 136 70 thrust fault
Kandovan 100 64 thrust fault
Mosha 91 400 thrust fault
North of Tehran 115 108 thrust fault
Ivanaki 143 75 thrust fault
Firoozkooh 84 40 thrust fault
Basham 96 71 thrust fault
Ourim 72 44 thrust fault
Damghan 136 100 thrust fault
Tab.1  The properties of available faults around the study area
Fig.1  Location and magnitude of earthquakes, Faults and their mechanism near the Babol
Fig.2  map of ground water distribution in Babol city
Fig.3  Simple model assumed by Nakamura
Fig.4  Location of microtremor recording stations and geotechnical boreholes
Fig.5  H/V spectral ratio
Fig.6  Fundamental frequency
Fig.7  Amplification factor
Fig.8  map of Kg distribution in Babol city
station liquefaction depths by using Seed & Idriss method/m K g value station liquefaction depths by using Seed & Idriss method/m K g value
B01 2–4.5 and 5.5–8 and 8.5–10.5 7.51 B28 5.5–8 5.51
B02 5-10 7.01 B30 1.25
B04 2.53 B32 4.74
B05 5.5–7 5.21 B35 3–6 and 6.5–10.5 14.6
B07 4.80 B37 6.5–9.5 6.61
B09 4.63 B39 4.7
B11 1.53 B42 5–12 8.14
B12 5–6.5& 8–9.5 6.15 B43 4.5–7 and 8–10 7.19
B15 4.63 B44 7–8 5.2
B18 1.10 B45 4–6.5 5.17
B19 6–7 and 9–10 5.93 B50 4–6 and 7–8 and 8.5–9.5 6.79
B22 3.65 B52 3.5-5 and 6.5-10.5 11.57
B23 8.5–10.5 5.42 B56 6.5–11 8.34
B25 3–4 and 4.5-5 and 5.5–8 and 8.5–10.5 10 B57 1.92
B27 4.12 B58 1.16
Tab.2  The liquefaction depths versus K g value
Fig.9  Evaluation of factor of safety using conventional and ANN method
Fig.10  The structure of a MLP-type network
borehole number soil type total stress effective stress N-SPT FS
1 CL 195 152 25 1.9
2 CH 175 134 23 1.8
3 SM 133 118 7 0.7
4 CH 145 108 16 1.5
5 CL 201 163 26 1.9
6 SC 144 111 13 1.3
7 SC 165 155 5 0.55
8 CL 222 174 29 2.2
9 CH 217 178 26 2.1
10 CL 158 123 12 1.1
11 CL 195 158 27 1.9
12 GW 176 144 14 1.1
13 CL 235 190 30 2.3
14 SM 195 151 25 1.9
15 CH 243 200 24 2
16 SC 139 123 8 0.85
17 CL 185 143 22 1.7
18 CH 197 155 24 1.9
19 CH 189 145 23 2
20 CL 165 129 26 1.8
21 SM 145 131 9 0.9
22 CH 156 119 18 1.25
23 SC 139 121 8 0.8
24 SM 161 127 22 1.5
25 GW 142 120 8 0.9
26 SM 195 161 15 1.3
27 CH 226 188 30 2.1
28 SC 143 138 5 0.6
29 SC 131 119 6 0.8
30 SM 152 117 16 1.3
Tab.3  data sets with inputs and output values with indicating the training and testing sets
range input output
soil type total stress effective stress N-SPT FS
max - 243 200 30 2.30
min - 133 108 5 0.55
ave - 179 145 19 1.58
Tab.4  Inputs and output ranges for training data sets used for construction of ANN model
range input output
soil type total stress effective stress N-SPT FS
max - 226 188 30 2.1
min - 131 117 5 0.6
ave - 164 139 15 1.21
Tab.5  Inputs and output ranges for testing data sets used for construction of ANN model
Fig.11  Maximum squared error versus number of hidden layer neurons
Fig.12  Effects of the number of hidden neurons on the network performance
Fig.13  Performance of ANN in term of regression value
Fig.14  Performance of ANN in term of regression value (normalized value of data)
Fig.15  ANN prediction for the FS for all boreholes
Fig.16  Regression value for train and test
Fig.17  Liquefaction microzonation of Babol by microtremor measurement
Fig.18  Liquefaction microzonation of Babol by ANN
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