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地下水封洞库单裂隙花岗岩纵波速度变化规律与预测模型

曹洋兵 吴阳 张朋 江志豪 张思怡 黄真萍

曹洋兵, 吴阳, 张朋, 江志豪, 张思怡, 黄真萍. 地下水封洞库单裂隙花岗岩纵波速度变化规律与预测模型[J]. 地质科技通报, 2023, 42(6): 12-20. doi: 10.19509/j.cnki.dzkq.tb20220279
引用本文: 曹洋兵, 吴阳, 张朋, 江志豪, 张思怡, 黄真萍. 地下水封洞库单裂隙花岗岩纵波速度变化规律与预测模型[J]. 地质科技通报, 2023, 42(6): 12-20. doi: 10.19509/j.cnki.dzkq.tb20220279
Cao Yangbing, Wu Yang, Zhang Peng, Jiang Zhihao, Zhang Siyi, Huang Zhenping. Prediction model and variation law of P-wave velocity of single fracture granite in an underground water-sealed storage cavern[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 12-20. doi: 10.19509/j.cnki.dzkq.tb20220279
Citation: Cao Yangbing, Wu Yang, Zhang Peng, Jiang Zhihao, Zhang Siyi, Huang Zhenping. Prediction model and variation law of P-wave velocity of single fracture granite in an underground water-sealed storage cavern[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 12-20. doi: 10.19509/j.cnki.dzkq.tb20220279

地下水封洞库单裂隙花岗岩纵波速度变化规律与预测模型

doi: 10.19509/j.cnki.dzkq.tb20220279
基金项目: 

福建省自然科学基金项目 2023J01424

岩土钻掘与防护教育部工程研究中心开放基金项目 201702

自然资源部丘陵山地地质灾害防治重点实验室(福建省地质灾害重点实验室)开放基金项目 FJKLGH2022K002

贵州省地质矿产勘查开发局地质科研项目 黔地矿科合[2020]1号

详细信息
    作者简介:

    曹洋兵(1987—), 男, 副教授, 主要从事岩体力学特性与稳定性评价工作。E-mail: ybcao@fzu.edu.cn

  • 中图分类号: TU45

Prediction model and variation law of P-wave velocity of single fracture granite in an underground water-sealed storage cavern

  • 摘要:

    揭示裂隙岩体纵波速度变化规律对工程岩体质量分级与稳定性评价具有重要意义。以某地下水封洞库无充填型单裂隙花岗岩为研究对象, 基于钻孔电视成像、水压致裂法地应力测试与声波全波列测井, 获取了384组单裂隙花岗岩的几何特性、受力状态与纵波速度, 构建起了预测单裂隙花岗岩纵波速度的进化-神经网络模型, 分析了关键指标影响下单裂隙花岗岩纵波速度的变化规律。研究表明: 该水封洞库单裂隙花岗岩纵波速度分布于4 300~5 330 m/s之间, 82.3%的纵波速度在4 700~5 200 m/s之间; 选取裂隙法向应力、平均张开度与倾角作为单裂隙花岗岩纵波速度的预测指标是合理可行的; 将现场测试数据分为训练样本与测试样本, 基于遗传算法优化神经网络权值、阈值的进化-神经网络模型构建出单裂隙花岗岩纵波速度预测模型, 其测试误差最大仅为2.9%, 85%的样本测试误差不超过1.5%, 预测模型精度较高。分析了纵波速度变化规律, 发现单裂隙花岗岩纵波速度随裂隙法向应力增大而增大, 但当法向应力增至5 MPa后的纵波速度增大速率逐渐减小, 纵波速度随裂隙张开度增大而逐渐减小, 纵波速度在裂隙倾角小于40°时无明显变化, 此后纵波速度随倾角增大而增大。

     

  • 图 1  单裂隙花岗岩纵波速度频率分布直方图

    Figure 1.  Frequency histogram of the P-wave velocity in granite with a single fracture

    图 2  单裂隙岩体等效弹性模型示意图

    Fn为法向力(N); t′为裂隙厚度(m);σn为法向应力(Pa); A为裂隙接触面积(m2); Kn为裂隙法向刚度(Pa/m);t1, t2分别为上、下岩块厚度(m);E1E2分别为上、下岩块弹性模量(Pa); k1, k2分别为上、下岩块等效弹簧刚度(N/m);k′为裂隙的等效弹簧刚度(N/m)

    Figure 2.  Schematic diagram of the equivalent elastic model of a single fracture rock mass

    图 3  质点速度沿模型Z轴方向分布图

    Figure 3.  P-wave velocity distribution among the Z-axis of the model

    图 4  纵波速度随法向刚度变化规律

    Figure 4.  P-wave velocity varies with normal stiffness

    图 5  纵波速度随裂隙倾角的变化规律

    Figure 5.  P-wave velocity varies with fracture dip angle

    图 6  现场试验数据统计分析

    a.不同法向应力区间的裂隙数量分布直方图; b.不同张开度区间的裂隙数量分布直方图; c.不同倾角区间的裂隙数量分布直方图

    Figure 6.  Statistical analysis of field test data

    图 7  进化-神经网络模型预测值与实测值对比

    Figure 7.  Comparison between the measured and predicted based on the evolutionary neural network model

    图 8  裂隙法向应力对纵波速度的影响

    Figure 8.  Variation feature related to obtained P-wave velocities derived from different fracture normal stresses

    图 9  裂隙张开度对纵波速度的影响规律

    Figure 9.  Variation feature related to obtained P-wave velocities derived from different fracture opening widths

    图 10  裂隙倾角对纵波速度的影响规律

    Figure 10.  Variation feature related to obtained P-wave velocities derived from different fracture dip anyles

    表  1  岩体物理力学参数

    Table  1.   Physical and mechanical parameters of the rock mass

    材料 参数 取值
    岩块 密度ρ/(kg·m-3) 2 700
    动弹性模量E/GPa 30
    动泊松比μ 0.25
    裂隙 法向刚度Kn/(GPa·m-1) 15
    切向刚度Ks/(GPa·m-1) 6
    下载: 导出CSV
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  • 收稿日期:  2022-06-17
  • 录用日期:  2022-07-27
  • 修回日期:  2022-07-23

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