Abstract
The present research introduces the best architecture model for predicting the unsoaked California bearing ratio (CBRu) of soil by comparing the models based on the least square support vector machine (LSSVM), long- short-term memory (LSTM), and artificial neural network (ANN) approach. The two kernel functions, linear and polynomial, have been selected to create LSSVM models. The developed LSTM models have been optimized by the Adam algorithm. In the employed ANN models, the Levenberg–Marquardt (LM), BFGS Quasi-Newton (BFG), scaled conjugate gradient (SCG), gradient descent with momentum (GDM), gradient descent (GD), and gradient descent with adaptive learning (GDA) algorithms have been used in the backpropagation process. For this purpose, three databases, such as training, testing and validation, have been compiled from the published research. A laboratory database has been developed by performing laboratory experiments for soil samples collected from and around Kota, Rajasthan, used for cross-validation of the best architecture model. The statistical tools, such as root means square error (RMSE), mean absolute error (MAE), correlation coefficient (R), mean absolute percentage error (MAPE), variance accounted for (VAF), weighted mean absolute percentage error (WMAPE), Nash–Sutcliffe efficiency (NS), normalized mean bias error (NMBE), Legate and McCabe’s index (LMI), root mean square error to observation's standard deviation ratio (RSR), a20-index, index of agreement (IOA) and index of scatter (IOS) have been used to measure the performance of the models. The LSTM model MD 14 has achieved higher performance and accuracy (RMSE = 0.9127%, MAE = 0.8114%, R = 0.9863%, MAPE = 9.0772%, VAF = 97.26, WMAPE = 0.0669%, NS = 0.9708, NMBE = 0.0687%, LMI = 0.1926, RSR = 0.1708, a20-index = 93.88, IOA = 0.9037 and IOS = 0.0752) in testing phase. For the performance validation, model (MD) 14 has predicted the CBRu of the validation database. Also, model MD 14 has attained higher performance (RMSE = 1.2671%, MAE = 1.0161%, R = 0.9909) in the validation phase. By comparing the performances and performing score analysis, the LSTM model MD 14 has been recognized as the best architecture model for predicting the unsoaked CBR of soil. Moreover, model MD 14 has gained over 96% (R = 0.9689) accuracy in predicting the CBRu of laboratory-tested soil samples. The present research also represents that the nonlinear approach has achieved higher performance with a high overfitting ratio. In addition, the artificial neural network requires a large database to predict the unsoaked CBR with higher performance and the least overfitting ratio. The present research also rejects the null hypothesis of normality. Sensitivity analysis illustrates that gravel content and maximum dry density of soil affect the prediction of unsoaked CBR.
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Data Availability
The database used in this research will be provided upon request.
Abbreviations
- \({C}_{C}\) :
-
Coefficient of curvature
- \({C}_{U}\) :
-
Coefficient of uniformity
- \({D}_{30}\) :
-
Grain size corresponding to 30% passing
- \({D}_{50}\) :
-
Grain size corresponding to 50% passing
- \({N}_{60}\) :
-
Corrected SPT-N
- \({\gamma }_{d}\) :
-
Dry unit weight
- AASHTO:
-
American Association of State Highways and Transportation Officials
- ANFIS:
-
Adaptive network-based fuzzy inference system
- ANN:
-
Artificial neural networks
- ASTM:
-
American Standards for Testing and Materials
- BFG_NN:
-
BFGS Quasi-Newton neural network
- C + S:
-
Clay and sand
- CBR:
-
California bearing ratio
- CBRU :
-
Unsoaked CBR
- CH:
-
Inorganic clays of high plasticity
- CI:
-
Inorganic clays of medium plasticity
- CL:
-
Inorganic clays of low plasticity
- COD:
-
Coefficient of determination
- CS:
-
Coarse sand content
- CSA-LSSVM:
-
Coupled simulated annealing least-square support vector machine
- DCPT:
-
Depth of penetration
- DE:
-
Differential equation
- DUW:
-
Dry unit weight
- ENRG:
-
Elastic net regularization regression
- ERT:
-
Extremely randomized trees
- FD:
-
Frequency distribution
- FS:
-
Fine Sand content
- G:
-
Gravel content
- GA:
-
Genetic algorithm
- GA-ANN:
-
Genetic algorithm optimized artificial neural network
- GD_NN:
-
Gradient descent neural network
- GDA_NN:
-
Gradient descent adaptive neural network
- GDM_NN:
-
Gradient descent with momentum neural network
- GEP:
-
Gene expression programming
- GP:
-
Genetic programming
- GPR:
-
Gaussian process regression
- GWO:
-
Grey wolves optimization
- L1:
-
Position of 1st layer
- LK-Star:
-
Lazy K star
- LL:
-
Liquid limit
- LLSVM-P:
-
Polynomial LSSVM
- LM_NN:
-
Levenberg–Marquardt neural network
- LMSR:
-
Least median of squares regression
- M5MT:
-
M-5 model trees
- MAE:
-
Mean absolute error
- MARS-C:
-
Multivariate adaptive regression splines with piecewise cubic
- MARS-L:
-
Multivariate adaptive regression splines with piecewise linear
- MDD:
-
Maximum dry density
- MLR:
-
Multilinear regression
- MLR:
-
Multilinear regression analysis
- MS:
-
Medium sand content
- N:
-
Number of Datasets
- NL:
-
Number of layers
- O:
-
Organic content
- OWC:
-
Optimum water content
- OMC:
-
Open method of coordination
- PI:
-
Plasticity Index
- PL:
-
Plastic limit
- PPV:
-
Peak particle velocity
- R:
-
Correlation coefficient/performance
- R2 :
-
Coefficient of determination
- RBFNN:
-
Radial basis function neural network
- RBN:
-
Radial basis networks
- REPTs:
-
Reduced error pruning trees
- RF:
-
Random forest
- RMSE:
-
Root mean square error
- RSS–ET:
-
Random subsurface-based extra tree
- RSS–REPT:
-
Random subsurface-based reduced error pruning trees
- SC:
-
Silt clay content
- SCG_NN:
-
Scaled conjugate gradient neural network
- SL:
-
Position of subsequent layers
- SLRA:
-
Single linear regression analysis
- T:
-
Tensile strength of geosynthetic
- VAF:
-
Variance accounted for
- WC:
-
Water content
- WMAPE:
-
Weighted mean absolute percentage error
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Khatti, J., Grover, K.S. CBR Prediction of Pavement Materials in Unsoaked Condition Using LSSVM, LSTM-RNN, and ANN Approaches. Int. J. Pavement Res. Technol. (2023). https://doi.org/10.1007/s42947-022-00268-6
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DOI: https://doi.org/10.1007/s42947-022-00268-6