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非煤露天矿山岩质边坡稳定性评价标准探讨

吴顺川 贺鹏彬 程海勇 王广和 张小强 张中信

吴顺川, 贺鹏彬, 程海勇, 王广和, 张小强, 张中信. 非煤露天矿山岩质边坡稳定性评价标准探讨[J]. 工程科学学报, 2022, 44(5): 876-885. doi: 10.13374/j.issn2095-9389.2021.02.01.001
引用本文: 吴顺川, 贺鹏彬, 程海勇, 王广和, 张小强, 张中信. 非煤露天矿山岩质边坡稳定性评价标准探讨[J]. 工程科学学报, 2022, 44(5): 876-885. doi: 10.13374/j.issn2095-9389.2021.02.01.001
WU Shun-chuan, HE Peng-bin, CHENG Hai-yong, WANG Guang-he, ZHANG Xiao-qiang, ZHANG Zhong-xin. Discussion on the stability evaluation standard of a rock slope in a noncoal open-pit mine[J]. Chinese Journal of Engineering, 2022, 44(5): 876-885. doi: 10.13374/j.issn2095-9389.2021.02.01.001
Citation: WU Shun-chuan, HE Peng-bin, CHENG Hai-yong, WANG Guang-he, ZHANG Xiao-qiang, ZHANG Zhong-xin. Discussion on the stability evaluation standard of a rock slope in a noncoal open-pit mine[J]. Chinese Journal of Engineering, 2022, 44(5): 876-885. doi: 10.13374/j.issn2095-9389.2021.02.01.001

非煤露天矿山岩质边坡稳定性评价标准探讨

doi: 10.13374/j.issn2095-9389.2021.02.01.001
基金项目: 云南省创新团队资助项目(202105AE160023);云南省高校科技创新团队资助项目(KKTA201921003)
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    E-mail: haiker2007@163.com

  • 中图分类号: TD804

Discussion on the stability evaluation standard of a rock slope in a noncoal open-pit mine

More Information
  • 摘要: 根据露天矿山的生产工艺特征,将岩质边坡划分为总体边坡、路间边坡和台阶边坡三种尺度,并对其控制因素、破坏模式进行了分析;结合土木工程边坡规范和非煤露天矿山边坡规范的边坡设计安全系数取值,讨论了国内外非煤露天矿山边坡设计安全系数的要求,提出了六条建议;综合考虑服务年限、边坡尺度规模的设计安全系数改进方案,并引入失稳概率,拓展了不同尺度边坡稳定性评价的设计标准,可有效提升非煤露天矿岩质边坡稳定性评价的合理性和科学性,进一步完善了矿山边坡设计理论和方法。

     

  • 图  1  露天矿岩质边坡结构参数与台阶分类示意图

    Figure  1.  Diagram of the structural parameters and step classification of a rock slope in an open-pit mine

    图  2  不同边坡设计方案对比

    Figure  2.  Comparison of different slope designs

    表  1  露天矿山边坡设计方案

    Table  1.   Slope design scheme of the open-pit mine

    Slope design schemeOverall angle/ (°)Safety factor
    Scheme 1381.462
    Scheme 2401.364
    下载: 导出CSV

    表  2  土木工程设计安全系数[30]

    Table  2.   Civil-engineering design safety factor[30]

    Material typeConditionsDesign safety factor
    Soil earthworksNormal loads and service conditions1.5
    Maximum loads and worst environmental conditions1.3
    Earth retainingNormal loads and service conditions2.0
    SlopesTemporary1.25
    Permanent1.5
    下载: 导出CSV

    表  3  边坡危害等级

    Table  3.   Slope hazard grade

    Slope hazard gradePossible casualtiesPotential economic risk/(106 ¥)Comprehensive assessment
    DirectIndirect
    Casualties≥1.0≥10Very serious
    Injured0.5−1.05−10Serious
    Unharmed≤0.5≤5Ordinary
    下载: 导出CSV

    表  4  边坡工程安全等级划分

    Table  4.   Safety classification of slope engineering

    Slope engineering safety gradeSlope height, H/mSlope hazard grade
    H>500Ⅰ, Ⅱ, Ⅲ
    300<H≤500Ⅰ, Ⅱ
    100<H≤300
    300<H≤500
    100<H≤300Ⅱ, Ⅲ
    H≤100
    100<H≤300
    H≤100Ⅱ, Ⅲ
    下载: 导出CSV

    表  5  不同荷载组合下总体边坡的设计安全系数

    Table  5.   Design safety factor of the overall slope under different load combinations

    Slope engineering
    safety grade
    Slope engineering design safety factor
    Load combination ⅠLoad combination ⅡLoad combination Ⅲ
    1.25−1.201.23−1.181.20−1.15
    1.20−1.151.18−1.131.15−1.10
    1.15−1.101.13−1.081.10−1.05
    下载: 导出CSV

    表  6  边坡危害等级建议

    Table  6.   Recommendation on the grade of the slope hazard

    Slope hazard gradePossible casualtiesPotential economic risk/
    (106 ¥)
    Comprehensive assessment
    DirectIndirect
    1Casualties≥10≥50Very serious
    2Injured2−1010−50Serious
    3Unharmed≤2≤10Ordinary
    下载: 导出CSV

    表  7  边坡工程安全等级划分建议

    Table  7.   Suggestions on the safety classification of slope engineering

    Slope engineering safety gradeSlope height, H/mSlope hazard gradeNote
    H>5001, 2, 3The engineering security levels should be increased a level for open-pit mine slope whose security level belong to II or III, or service years greater than 25
    300<H≤5001, 2
    100<H≤3001
    300<H≤5003
    100<H≤3002, 3
    H≤1001
    100<H≤3003
    H≤1002, 3
    下载: 导出CSV

    表  8  采矿岩石边坡可接受的失稳概率

    Table  8.   Acceptable instability probability of mining rock slopes

    CategoryDescriptionAcceptable instability probability
    1Critical slopes where failure may affect the continuous operation and pit safety<5%
    2Slopes where failure have a significant impact on costs and safety<15%
    3Slopes where failure has a notable impact on costs and
    where minimal safety hazards exist
    <30%
    下载: 导出CSV

    表  9  露天矿岩质边坡设计安全系数与失稳概率建议值

    Table  9.   Suggested value of the design safety factor and instability probability of the rock slope in the open-pit mine

    Slope scaleSlope engineering safety gradeAcceptable criteria
    Minimum design safety factor (static)Minimum design safety factor (dynamic)Maximum instability probability/%
    BenchⅠ, Ⅱ, Ⅲ1.125
    Inter-ramp1.151.020
    1.21.015
    1.21.1
    Overall1.21.015
    1.251.0510
    1.31.15
    Important productionⅠ, Ⅱ, Ⅲ1.31.15
    下载: 导出CSV
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  • 收稿日期:  2021-02-01
  • 网络出版日期:  2021-04-12
  • 刊出日期:  2022-05-05

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