基于偏最小二乘法的红粘土裂隙参数关系分析

Analysis of the fracture parameters of red clay based on partial least square method

利用MATLAB软件,对干湿循环作用后的红粘土表面裂隙参数进行了提取。基于偏最小二乘算法,定量分析和描述了各裂隙参数之间的关系。分析结果表明:首次干湿循环作用对土样开裂的影响最为明显,红粘土裂隙参数变化幅度最大;PLS法实用有效,其拟合值与实际测量结果的偏差很小,实际结果的预测精度比较高;裂隙的节点个数、区块数目及裂隙率可用来表征裂隙的开裂程度,定量描述红粘土的形态结构和几何特征。研究成果可简化裂隙的量测,提高量测工作的效率。

The fracture parameters of red clay surface was extracted by using MATLAB software after dry-wet cycles,and the quantitative analysis and the relations on the frac-ture parameters are described based on partial least squares algorithm.The results show that the effect of first dry-wet cycles is the most obvious to the soil cracking,the varia-tion of the fracture parameters of red clay is the maximum.The PLS method is practical and effective,the deviation of fitted and actual measurement results is small with rela-tively high prediction accuracy results.The node number,block number and fracture rate can be used to characterize the degree of cracking,and quantitative description of the morphology and geometric features of the red clay.Research results can be simplified with crack measurement,improve the efficiency of measurement work can be improved.