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基于无监督方法确定岩土参数取值

阮永芬 李鹏辉 朱强 王勇 闫明

阮永芬,李鹏辉,朱强,等. 基于无监督方法确定岩土参数取值[J]. 水文地质工程地质,2023,50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202207046
引用本文: 阮永芬,李鹏辉,朱强,等. 基于无监督方法确定岩土参数取值[J]. 水文地质工程地质,2023,50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202207046
RUAN Yongfen, LI Penghui, ZHU Qiang, et al. Determination of geotechnical parameters based on the unsupervised learning method[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202207046
Citation: RUAN Yongfen, LI Penghui, ZHU Qiang, et al. Determination of geotechnical parameters based on the unsupervised learning method[J]. Hydrogeology & Engineering Geology, 2023, 50(0): 1-12 doi:  10.16030/j.cnki.issn.1000-3665.202207046

基于无监督方法确定岩土参数取值

doi: 10.16030/j.cnki.issn.1000-3665.202207046
基金项目: 中铁二十局集团第五工程有限公司科研计划项目(CR2005-5-JS-2021-009)
详细信息
    作者简介:

    阮永芬(1964-),女,博士,教授,主要从事岩土工程方面的研究。E-mail:rryy64@163.com

    通讯作者:

    李鹏辉(1999-),男,硕士研究生,主要从事岩土工程方面的研究。E-mail:1017343481@qq.com

  • 中图分类号: TU443

Determination of geotechnical parameters based on the unsupervised learning method

  • 摘要: 随着城市工程建设的发展,建筑工程事故问题愈发突出,采用传统方求取的岩土参数区间无法满足实际工程需要。基于无监督学习思想,选取工程性质较差的泥炭质土,结合工程经验选用8个物理指标作为输入集,利用主成分分析(PCA)算法实现多样本多参数去耦合的降维处理,得出各物理指标相关性及敏感度,结合其相关性及敏感度赋予不同埋深泥炭质土物理指标的综合评价值。利用k-means聚类分析泥炭质土物理指标、综合评价值及工程特性之间关系,为岩土参数选取提供理论基础。采用监督学习方法—BP神经网络算法分析无监督结果,验证(PCA—k-means)算法模型的合理性。将通过聚类分析得到的正态样本利用多种截尾法优化,得到可靠取值区间,并将取值结果与实际工程取值比较,验证该模型工程参数取值合理性。该算法模型具有较好的工程应用价值,所得研究结果可为工程勘察、设计、施工参数取值提供参考,也能为岩土参数取值分析提供新的分析方法。
  • 图  1  会展中心地层构造图

    Figure  1.  Stratigraphic diagram of the convention center

    图  2  pwwLea1-2关系曲线

    Figure  2.  Relationship of p and w, wL, e and a1-2

    图  3  wuwwLea1-2关系曲线

    Figure  3.  Relationship of wu and w, wL, e and a1-2

    图  4  特征值变化规律

    Figure  4.  Variation of elgenvalues

    图  5  累计贡献率

    Figure  5.  Cumulative contribution

    图  6  判别指标分类结果

    Figure  6.  Discriminative index classification results

    图  7  综合评价分类结果

    Figure  7.  Results of comprehensive evaluation

    图  8  ewwL分类结果

    Figure  8.  Classification results of ew and wL

    图  9  分类结果对比

    Figure  9.  Comparison of classification results

    图  10  综合评价值对比

    Figure  10.  Comprehensive evaluation and comparison

    图  11  三个物理指标原样本分布图

    Figure  11.  Original sample distribution map of three physical indicators

    图  12  分类后三个物理指标样本分布图

    Figure  12.  Sample distribution map of three physical indicators after classification

    表  1  各层泥炭质土的物理指标统计表

    Table  1.   Statistical table of physical indexes of peaty soil in each layer

    地层编号ρ
    /(g·cm−3
    Gsw
    /%
    wL
    /%
    wP
    /%
    ea1-2
    /MPa
    wu
    /%
    111.612.30110.1135.4100.02.491.6224.33
    21.422.42101.2119.287.22.401.3218.36
    11.251.95145.7182.1146.42.931.4940.10
    121.271.97130.6174.3140.62.521.1238.77
    下载: 导出CSV

    表  2  不同物理指标间的相关性系数

    Table  2.   Correlation between different physical indicators

    R,2ρGSwwLea1-2wPwu
    ρ1.00
    GS0.641.00
    w0.870.551.00
    wL0.890.590.941.00
    e0.850.850.940.871.00
    a1-20.620.420.810.680.851.00
    wP0.850.580.820.930.580.491.00
    wu0.830.660.730.780.700.450.801.00
    下载: 导出CSV

    表  3  各物理指标敏感度统计表

    Table  3.   Sensitivity statistics of each physical index

    物理指标编码X1(ρ)X2GSX3wX4wLX5eX6a1-2X7wPX8wu
    敏感度0.23490.20690.25400.24280.26080.21510.24100.2281
    下载: 导出CSV

    表  4  各组泥炭质土综合评价值排序

    Table  4.   Ranking of comprehensive evaluation of the peaty soil

    组类ρ/(g·cm−3w/%GSewL/%wP/%a1-2/MPawu/%综合评价
    11.56557.5902.5171.53668.69042.6900.7228.100-1.295
    21.53367.9802.3971.56571.73044.9100.81212.670-1.162
    31.49968.2802.4281.69976.18048.2701.10311.690-1.096
    41.48372.1202.4361.82484.80049.5600.97712.270-1.035
    51.45273.6902.2381.88292.40058.8900.85013.678-0.928
    61.45478.0702.4261.97190.32053.5501.12112.100-0.946
    71.45582.1802.4261.95795.36362.1810.83313.318-0.900
    341.115211.2001.7964.406228.270149.4003.80243.7501.293
    351.134220.2001.1644.761228.710144.1004.71844.3461.496
    361.117232.7001.3114.818238.770149.3105.03140.8171.566
    371.121247.0000.9965.327249.400156.3006.00641.7101.861
    381.079287.1820.9905.839304.936207.8005.97856.4552.574
    下载: 导出CSV

    表  5  不同截尾法的原物理指标区间范围

    Table  5.   Original physical index range of different censoring methods

    物理指标均值μ标准差σ偏度系数c变异系数δ3σ区间范围c33区间范围c3区间范围
    e3.031.200.940.39[0,6.63][0.56,7.76][0,7.76]
    w/%133.0262.090.930.46[0,319.29][4.48,377.03][0,377.03]
    wL/%148.6361.260.870.41[0,332.41][18.14,385.71][0,385.71]
    下载: 导出CSV

    表  6  物理指标样本检验结果

    Table  6.   Normal test result of the physical index sample

    指标分布类型D值P值检验结果
    e图11.a)正态分布0.1551.81E-4排除
    e图12.a)正态分布0.091.00接受
    w图11.b)正态分布0.1892.36E-12排除
    w图12.b)正态分布0.0640.710接受
    wL图11.c)正态分布0.1461.62 E-7排除
    wL图12.c)正态分布0.0720.190接受
    下载: 导出CSV

    表  7  不同截尾法的新样本区间范围

    Table  7.   Range of new sample intervals for different censoring methods

    物理指标均值μ标准差σ偏度系数c变异系数δ3σ区间范围c33区间范围c3区间范围
    e2.190.400.390.18[0.99,3.39][1.45,3.55][0.99,3.55]
    w/%88.6817.400.390.18[36.48,140.88][43.26,147.66][36.48,140.88]
    wL/%105.5522.110.280.20[39.22,171.88][45.41,178.07][39.22,178.08]
    ρ/(g·cm−31.400.080.080.06[1.13,1.66][1.15,1.67][1.13,1.67]
    Gs2.250.45-3.080.20[0.89,3.61][1.15,3.55][1.15,3.61]
    a1-2/MPa1.240.561.560.45[0,2.93][0.43,3.81][0,2.93]
    wP/%68.7618.060.380.26[14.57,122.97][21.48,129.88][14.57,129.88]
    wu/%17.637.642.020.43[0,40.57][10.17,56.06][0,56.06]
    下载: 导出CSV

    表  8  各层泥炭质土设计参数检验结果

    Table  8.   Test results of design parameters of the peaty soil in each layer

    地层
    编号
    ρ
    /(g·cm−3
    w
    /%
    eILa1-2
    /MPa
    综合
    评价
    所属类
    111.371032.410.151.63−0.231
    21.3991.12.330.121.30−0.261
    11.20142.32.92−0.141.47−0.081
    121.26127.72.53−0.281.12−0.161
    下载: 导出CSV
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