基于CPT的卷积神经网络实现压缩模量的可视化

    VISUALIZING THE COMPRESSIVE MODULUS USING CONVOLUTIONAL NEURAL NETWORKS BASED ON CPT

    • 摘要: 压缩模量对地质灾害评估具有重要作用,因此,基于有限的CPT测试数据准确预测场地的压缩模量是亟待解决的关键问题。本文将卷积神经网络(CNN)模型和Kriging插值结合,能够提供有效准确的压缩模量的空间分布特征,为土体压缩模量预测提供了一种直观可视的途径。首先设计CNN模型的架构,并确定超参数,而后通过学习一定的样本数据,CNN模型提取CPT测试参数与压缩模量之间的隐式关系;同时,利用Kriging插值生成CPT测试参数随机场,为CNN模型提供输入。研究结果表明,Kriging插值代表性的预测锥尖阻力与侧壁摩阻力,两者均在深度上呈现强变异性,在水平向呈弱变异性;CNN模型在小卷积核、短步长、多特征提取的架构下,误差小,预测的压缩模量随机场与经验具有一致性;在具体位置处经过验证,预测的压缩模量R2达0.787,因此,预测的压缩模量具有相当的场地代表性,可为该场地的沉降计算和风险评估等后续工作提供参考。

       

      Abstract: Accurate anticipation of soil compression modulus is crucial for geological hazard assessment, particularly in cases where cone penetration test (CPT) data are scarce. This study proposes a novel approach, combining a convolutional neural network (CNN) model and Kriging interpolation, to effectively predict soil compression modulus and visually display its spatial distribution characteristics. The convolutional neural network model, with its architecture and parameters determined through training, learned from sample data to investigate the implicit correlation between CPT parameters and the compression modulus. It utilized the random field generated by Kriging interpolation as input to predict the compression modulus of the site. The results showed that Kriging interpolation was able to accurately forecast cone tip resistance and sleeve friction. The variability of these parameters was pronounced with depth but less significant horizontally. In the CNN model employing small convolutional kernels, short strides, and a multi-feature extraction architecture, the predicted random field of compression modulus aligned well with empirical data. The predicted compressive modulus, validated at a specific location, exhibited a correlation coefficient (R2) of 0.787. Therefore, the predicted compression modulus is quite representative of the site, and this consistency can serve as a reference for settlement computations and risk evaluations.

       

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