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考虑降雨条件陕北Q2黄土斜坡稳定性的非线性劣化研究

周少伟 边小卫 李卫波 马园园 李菲

周少伟, 边小卫, 李卫波, 马园园, 李菲. 考虑降雨条件陕北Q2黄土斜坡稳定性的非线性劣化研究[J]. 地质科技通报, 2024, 43(3): 218-226. doi: 10.19509/j.cnki.dzkq.tb20230432
引用本文: 周少伟, 边小卫, 李卫波, 马园园, 李菲. 考虑降雨条件陕北Q2黄土斜坡稳定性的非线性劣化研究[J]. 地质科技通报, 2024, 43(3): 218-226. doi: 10.19509/j.cnki.dzkq.tb20230432
ZHOU Shaowei, BIAN Xiaowei, LI Weibo, MA Yuanyuan, LI Fei. Nonlinear degradation of stability of Q2 loess slopes in northern Shaanxi considering rainfall conditions[J]. Bulletin of Geological Science and Technology, 2024, 43(3): 218-226. doi: 10.19509/j.cnki.dzkq.tb20230432
Citation: ZHOU Shaowei, BIAN Xiaowei, LI Weibo, MA Yuanyuan, LI Fei. Nonlinear degradation of stability of Q2 loess slopes in northern Shaanxi considering rainfall conditions[J]. Bulletin of Geological Science and Technology, 2024, 43(3): 218-226. doi: 10.19509/j.cnki.dzkq.tb20230432

考虑降雨条件陕北Q2黄土斜坡稳定性的非线性劣化研究

doi: 10.19509/j.cnki.dzkq.tb20230432
基金项目: 

陕西省重点研发计划项目“地质作用对陕北生态脆弱区生态环境影响机理研究” 2021SF2-03

陕西省地质灾害防治体系建设项目 202320

详细信息
    通讯作者:

    周少伟,E-mail:418585618@qq.com

  • 中图分类号: P642.22;P642.13

Nonlinear degradation of stability of Q2 loess slopes in northern Shaanxi considering rainfall conditions

More Information
  • 摘要:

    降雨致灾是陕北黄土斜坡最常见的灾害之一, 揭示降雨对黄土斜坡稳定性影响特征有利于预防滑坡灾害的发生。通过一系列室内试验研究了降雨条件下陕北Q2黄土的力学特性变化特征, 并结合数值模拟分析了其对陕北黄土斜坡稳定性的影响。首先设计干湿循环试验(循环路径和次数)以模拟降雨条件(如强度、频次等); 其次通过三轴剪切试验获取陕北Q2黄土的力学性质的变化规律; 最后以陕北地区某黄土斜坡为例, 利用有限元计算并分析不同降雨条件下斜坡安全系数和塑性区的变化特征。结果表明: (1)干湿循环作用后Q2黄土的抗剪强度存在非线性劣化特征。当干湿循环次数超过一定范围后, 黄土物理力学性质参数劣化的边际效应减弱, 并趋于稳定。(2)降雨作用下黄土斜坡的稳定性呈现出随着降雨频次或降雨强度的增加而降低的趋势。(3)Q2黄土斜坡的塑性区范围随着Q2黄土力学性能的不断劣化而增大, 体现了降雨条件对黄土斜坡稳定性影响的非线性特征。研究结果为降雨型滑坡预防提供参考。

     

  • 图 1  陕西省志丹县DBXP088斜坡地理地貌概况(a)及潜在滑坡处取样点(b, c)

    Figure 1.  Geographical and geomorphological survey(a) and sampling points of potential landslides(b, c) of DBXP088 slope in Zhidan County, Shaanxi Province

    图 2  陕西省志丹县多年月平均降水量示意图(2000-2022年,志丹县气象局)

    Figure 2.  Schematic diagram of monthly average precipitation for many years in Zhidan County, Shaanxi Province

    图 3  GDS三轴试验系统主要组成

    Figure 3.  Main components of GDS triaxial test system

    图 4  不同干湿循环作用下Q2黄土的应力-应变关系(n为干湿循环次数,路径信息见表 4,下同)

    Figure 4.  Stress-strain relationship of Q2 loess under different drying-wetting cycles

    图 5  不同干湿循环作用下Q2黄土参数的变化规律

    Figure 5.  Variation of shear strength of Q2 loess under different drying-wetting cycles

    图 6  DBXP088斜坡有限元模型

    Figure 6.  Finite element model of DBXP088 slope

    图 7  不同干湿循环作用下斜坡安全系数变化

    Figure 7.  Change of slope safety factor under different drying-wetting cycles

    图 8  当折减系数Fv=1.57时不同干湿循环作用下斜坡滑动面云图

    Figure 8.  Nephogram of slope sliding surface under different drying-wetting cycles with a reduction factor Fv of 1.57

    表  1  DBXP088斜坡中Q2黄土物理性质

    Table  1.   Physical propeities of Q2 loess in DBXP088 slope

    指标 含水率/% 天然密度/(g·cm-3) 干密度/(g·cm-3) 比重 孔隙比/% 饱和度/% 液限/% 塑限/%
    10.30 1.88 1.36 2.71 0.69 74.7 29.37 16.55
    下载: 导出CSV

    表  2  DBXP088斜坡中Q2黄土粒径分布特征

    Table  2.   Distribution of Q2 loess particles in DBXP088 slope

    粒径种类 粗粒 细粒
    粉粒组 黏粒组
    粒径/mm ≥0.075 0.075~0.005 ≤0.005
    质量分数/% 3.72 67.62 28.66
    下载: 导出CSV

    表  3  DBXP088斜坡中黄土力学参数

    Table  3.   Main mechanical parameters in DBXP088 slope

    地层 变形模量/MPa 泊松比 黏聚力/kPa 内摩擦角/(°) 抗剪强度/kPa
    Q2黄土 18.09 0.29 87.38 27.90 612.33
    地层 天然密度/(g·cm-3) 变形模量/MPa 泊松比 黏聚力/kPa 内摩擦角/(°) 地层厚度/m
    Q3黄土 1.58 5.62 0.31 31.73 23.60 5.00
    下载: 导出CSV

    表  4  干湿循环作用路径试验设计方案

    Table  4.   Experimental design scheme of drying-wetting cycles action path

    路径编号 下限质量含水率/% 上限质量含水率/% 质量含水率幅度(上限-下限)/% 停止后质量含水率/%
    路径1 4.0 18.0 14.0 10.3
    路径2 4.0 24.0 20.0
    路径3 4.0 30.0 26.0
    下载: 导出CSV

    表  5  Q2黄土试样编号及不同干湿循环作用下主要物理力学参数

    Table  5.   Number of Q2 loess samples and main physical and mechanical parameters under different drying-wetting cycles

    试样标号 循环路径 循环次数/次 天然密度/(g·cm-3) 泊松比 变形模量/MPa 黏聚力/kPa 内摩擦角/(°)
    N-0 无干湿循环作用 0 1.88 0.29 18.09 87.38 27.9
    N1-1 路径1 1 1.88 0.29 17.43 80.40 25.8
    N1-2 3 1.88 0.29 16.52 74.36 23.7
    N1-3 7 1.88 0.29 14.24 69.90 22.3
    N1-4 10 1.88 0.29 10.17 58.66 21.7
    N1-5 14 1.88 0.29 13.55 66.96 22.1
    N1-6 18 1.88 0.29 10.21 70.11 22.2
    N1-7 21 1.88 0.29 10.15 70.79 21.9
    N2-1 路径2 1 1.88 0.29 16.69 75.72 23.7
    N2-2 3 1.88 0.29 11.17 65.38 20.5
    N2-3 7 1.88 0.29 10.32 51.48 19.9
    N2-4 10 1.88 0.29 9.07 54.62 20.4
    N2-5 14 1.88 0.29 8.23 61.81 21.1
    N2-6 18 1.88 0.29 8.73 64.71 21.3
    N2-7 21 1.88 0.29 8.66 60.60 21.3
    N3-1 路径3 1 1.88 0.29 15.24 63.81 21.9
    N3-2 3 1.88 0.29 9.82 31.73 19.8
    N3-3 7 1.88 0.29 8.47 26.59 19.6
    N3-4 10 1.88 0.29 6.84 38.24 20.2
    N3-5 14 1.88 0.29 6.75 49.01 20.9
    N3-6 18 1.88 0.29 7.43 55.09 21.2
    N3-7 21 1.88 0.29 7.54 58.66 21.0
    下载: 导出CSV
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  • 收稿日期:  2023-07-25
  • 录用日期:  2024-01-02
  • 修回日期:  2023-12-18

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