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    单体库岸滑坡及其次生涌浪灾害风险分析

    王芳 殷坤龙 桂蕾 陈丽霞

    王芳, 殷坤龙, 桂蕾, 陈丽霞, 2018. 单体库岸滑坡及其次生涌浪灾害风险分析. 地球科学, 43(3): 899-909. doi: 10.3799/dqkx.2018.910
    引用本文: 王芳, 殷坤龙, 桂蕾, 陈丽霞, 2018. 单体库岸滑坡及其次生涌浪灾害风险分析. 地球科学, 43(3): 899-909. doi: 10.3799/dqkx.2018.910
    Wang Fang, Yin Kunlong, Gui Lei, Chen Lixia, 2018. Risk Analysis on Individual Reservoir Bank Landslide and Its Generated Wave. Earth Science, 43(3): 899-909. doi: 10.3799/dqkx.2018.910
    Citation: Wang Fang, Yin Kunlong, Gui Lei, Chen Lixia, 2018. Risk Analysis on Individual Reservoir Bank Landslide and Its Generated Wave. Earth Science, 43(3): 899-909. doi: 10.3799/dqkx.2018.910

    单体库岸滑坡及其次生涌浪灾害风险分析

    doi: 10.3799/dqkx.2018.910
    基金项目: 

    国家自然科学基金项目 41572292

    国家自然科学基金项目 41601563

    国家自然科学基金项目 41641012

    详细信息
      作者简介:

      王芳(1977-), 女, 博士研究生, 主要从事地质灾害风险评价的研究

      通讯作者:

      殷坤龙

    • 中图分类号: P642.22

    Risk Analysis on Individual Reservoir Bank Landslide and Its Generated Wave

    • 摘要: 水库滑坡次生涌浪灾害是库水运营过程中重要的灾害类型,开展滑坡及其次生涌浪灾害风险分析,能够合理确定并评价滑坡及其次生涌浪灾害对生命及财产的影响程度,从而为采取经济有效的减灾应急措施提供理论依据和技术支持.以三峡库区万州区塘角1号滑坡为例,探讨不同库水位降雨组合工况下,考虑空间差异性的单体滑坡危险性分析方法;确定滑坡次生涌浪灾害影响范围;完善滑坡及其次生涌浪灾害承灾体易损性评价方法;绘制最危险工况下塘角1号滑坡及其次生涌浪灾害经济风险和人口风险分布图,得出:塘角1号滑坡最危险工况为库水位175~145 m+3日100 mm降雨.在该工况下,塘角1号滑坡及其次生灾害总经济风险为2 239万元;坡体上室内人口总风险为0.55人.研究成果以期为指导该类滑坡减灾防灾提供思路和依据.

       

    • 图  1  塘角1号滑坡稳定性分区图

      Fig.  1.  Stability classification map of Tangjiao No.1 landslide

      图  2  塘角1号滑坡各分区剖面计算模型

      a.A1区剖面;b.A2区剖面;c.A3区-1剖面;d.A3区-2、B1区、B2区剖面

      Fig.  2.  Profile calculation model of each part of Tangjiao No.1 landslide

      图  3  塘角1号滑坡前缘库水位175~145 m调度图

      Fig.  3.  Scheduling of the water level decreasing from 175 m to 145 m in front of Tangjiao No.1 landslide

      图  4  塘角1号滑坡工况1下各分区破坏概率及稳定性曲线

      a.A1区;b.A2区;c.A3区-1;d.A3区-2;e.B1区;f.B2区

      Fig.  4.  Failure probability and safety factor curve of Tangjiao No.1 landslide under Scenario No.1

      图  5  塘角1号滑坡A1区剖面条分图

      Fig.  5.  Slices of A1 part of Tangjiao No.1 landslide

      图  6  条块受力分布图

      Fig.  6.  Forces of block

      图  7  塘角1号滑坡A1区涌浪高度及传播范围

      Fig.  7.  Height and propagation range of landslide generated wave of A1 part of Tangjiao No.1 landslide

      图  8  船舶(3 000 t)撞击力与码头前初始涌浪高度关系图

      数据来源王平义等(2016)

      Fig.  8.  Relationship between ship (3 000 t) impact force and wave height in front of the wharf

      图  9  最危险工况下塘角1号滑坡及其次生灾害经济风险分布图

      Fig.  9.  Economic risk map of Tangjiao No.1 landslide and its generated wave under the most dangerous scenario

      图  10  最危险工况下塘角1号滑坡坡体上风险分布图(风险小于1人均取1)

      Fig.  10.  Indoor population risk map of Tangjiao No.1 landslide under the most dangerous scenario (if risk < 1, take 1)

      表  1  塘角1号滑坡计算工况

      Table  1.   Calculation scenarios of Tangjiao No.1 landslide

      工况 库水位 降雨
      工况1 175 m降至145 m 单日0 mm
      工况2 175 m降至145 m 单日100 mm
      工况3 175 m降至145 m 3日50 mm
      工况4 175 m降至145 m 3日100 mm
      下载: 导出CSV

      表  2  塘角1号滑坡材料参数(曹颖, 2016)

      Table  2.   Material parameters of Tangjiao No.1 landslide

      参数 状态 滑体 滑床
      重度(kN/m3) 天然 19.8 25.3
      饱和 20.6 25.7
      内聚力C(kPa) 天然 26.3 220
      饱和 18.2 205
      内摩擦角φ(°) 天然 14.2 35.9
      饱和 9.4 35.6
      渗透系数(m/s) 天然 2.10E-06 /
      饱和 5.50E-07 /
      体积含水量(m3/m3) 天然 0.301 /
      饱和 0.305 /
      下载: 导出CSV

      表  3  塘角1号滑坡各工况下破坏概率及稳定性计算结果

      Table  3.   Failure probability and safety factor of Tangjiao No.1 landslide under all the Scenarios

      工况 时步 破坏概率P(%) 稳定性系数Fs
      A1 A2 A3-1 A3-2 B1 B2 A1 A2 A3-1 A3-2 B1 B2
      207 94.55 16.05 0.00 0.15 0.00 0.15 0.846 1.138 1.705 2.221 2.783 2.385
      工况1 208 94.70 16.20 0.00 0.15 0.00 0.15 0.844 1.137 1.706 2.221 2.783 2.385
      209 95.00 16.40 0.00 0.15 0.00 0.15 0.843 1.135 1.706 2.221 2.783 2.385
      207 94.95 16.05 0.00 0.15 0.00 0.15 0.843 1.138 1.703 2.171 2.781 2.383
      工况2 208 95.10 16.25 0.00 0.15 0.00 0.15 0.841 1.136 1.703 2.171 2.805 2.384
      209 95.25 16.55 0.00 0.15 0.00 0.15 0.840 1.135 1.703 2.171 2.805 2.384
      207 94.95 16.05 0.00 0.15 0.00 0.15 0.843 1.138 1.704 2.171 2.781 2.385
      工况3 208 95.10 16.25 0.00 0.15 0.00 0.15 0.841 1.136 1.703 2.171 2.781 2.385
      209 95.25 16.70 0.00 0.15 0.00 0.15 0.839 1.134 1.703 2.171 2.781 2.385
      207 94.95 16.05 0.00 0.15 0.00 0.15 0.843 1.138 1.703 2.171 2.781 2.383
      工况4 208 95.10 16.30 0.00 0.15 0.00 0.15 0.841 1.136 1.702 2.171 2.781 2.383
      209 95.25 16.70 0.00 0.15 0.00 0.15 0.839 1.134 1.702 2.171 2.781 2.383
      下载: 导出CSV

      表  4  塘角1号滑坡涌浪计算参数

      Table  4.   Calculation parameters for Tangjiao No.1 landslide generated wave

      滑坡参数 河道参数
      长度l(m) 66.93 对岸岸坡坡角β(°) 15
      宽度w(m) 349.94 河道宽度b(m) 975.8
      厚度t(m) 12.99 水深h(m) 58.31
      滑面倾角α(°) 4
      平均速度v(m/s) 4.55
      下载: 导出CSV

      表  5  塘角1号滑坡致灾强度评价标准(杜娟, 2012; 曹颖2016)

      Table  5.   Standard for landslide intensity evaluation of Tangjiao No.1 landslide

      滑坡致灾强度
      变形速度(mm/s)
      滑体厚度/建筑物基础埋深(m)
      < 0.4 0.4~0.8 0.8~1.2 1.2~1.6 >1.6
      < 5×10-7 0.30 0.80 1 0.70 0.20
      5×10-7~5×10-5 0.37 0.82 1 0.73 0.28
      5×10-5~5×10-3 0.44 0.84 1 0.76 0.36
      5×10-3~5×10-1 0.65 0.90 1 0.85 0.60
      >5×10-1 1 1 1 1 1
      下载: 导出CSV

      表  6  塘角1号滑坡土地道路抗灾能力评价标准(桂蕾, 2014)

      Table  6.   Standard for resistance evaluation on land and road on Tangjiao No.1 landslide

      承灾体类型 耕地 林地 水域 乡村街道
      抗灾能力 0.3 0.5 0.3 0.1
      下载: 导出CSV

      表  7  塘角1号滑坡房屋建筑抗灾能力评价标准

      Table  7.   Standard for resistance evaluation on buildings on Tangjiao No.1 landslide

      抗灾能力
      修筑年代
      农村居民建筑
      土木结构 砖混结构
      ≤1980 0.01 0.1
      ≤1990 0.03 0.2
      ≤2000 0.05 0.3
      ≤2010 0.05 0.5
      >2010 0.1 0.5
      下载: 导出CSV

      表  8  塘角1号滑坡室内人员抗灾能力评价标准

      Table  8.   Standard for resistance evaluation on indoor personnel on Tangjiao No.1 landslide

      抗灾能力
      修筑年代
      室内人员
      老人小孩 青年
      土木结构 砖混结构 土木结构 砖混结构
      ≤1980 0.1 0.3 0.3 0.5
      ≤1990 0.1 0.3 0.3 0.5
      ≤2000 0.1 0.5 0.3 0.7
      ≤2010 0.1 0.5 0.5 0.7
      >2010 0.1 0.5 0.5 0.7
      下载: 导出CSV

      表  9  塘角1号A1区滑坡涌浪范围内码头易损性

      Table  9.   Vulnerability of wharfs in the range of A1 part of Tangjiao No.1 landslide generated wave

      码头编号 码头类型 初始波高(m) 撞击力(MN) 涌浪对码头致灾强度I 码头抗灾能力R 易损性
      1 客运 0.31 0.56 0.16 0.9 0.07
      2 货运 0.33 0.56 0.17 0.8 0.09
      3 0.45 0.61 0.18 0.9 0.08
      4 矿石 0.76 0.72 0.21 0.8 0.14
      5 货运 0.89 0.77 0.23 0.7 0.21
      6 客运 0.99 0.80 0.24 0.5 0.44
      下载: 导出CSV

      表  10  塘角1号A1区滑坡涌浪范围内河道驳船航行易损性

      Table  10.   Vulnerability of barges in the range of A1 part of Tangjiao No.1 landslide generated wave

      涌浪类型 涌浪距滑坡点距离(km) 涌浪高度(m) 涌浪对船只致灾强度I 驳船抗灾能力R 易损性V
      最大首浪 0.00 2.63 1.00 0.70 1.00
      沿程传播浪 1.00 0.89 0.60 0.70 0.96
      沿程传播浪 2.00 0.66 0.44 0.70 0.73
      沿程传播浪 3.00 0.54 0.36 0.70 0.52
      沿程传播浪 4.00 0.45 0.30 0.70 0.37
      沿程传播浪 5.00 0.39 0.26 0.70 0.28
      沿程传播浪 6.00 0.35 0.23 0.70 0.22
      沿程传播浪 7.00 0.31 0.21 0.70 0.18
      沿对岸传播浪 0.20 2.09 1.00 0.70 1.00
      沿对岸传播浪 0.30 1.71 1.00 0.70 1.00
      沿对岸传播浪 0.40 1.48 0.99 0.70 1.00
      沿对岸传播浪 0.50 1.32 0.88 0.70 1.00
      沿对岸传播浪 0.60 1.21 0.80 0.70 1.00
      沿对岸传播浪 0.70 1.12 0.74 0.70 1.00
      沿对岸传播浪 0.80 1.04 0.70 0.70 1.00
      沿对岸传播浪 0.90 0.99 0.66 0.70 0.99
      沿对岸传播浪 0.98 0.95 0.63 0.70 0.98
      下载: 导出CSV

      表  11  塘角1号滑坡及其次生涌浪灾害影响范围内承灾体经济价值标准

      Table  11.   Economic standards of elements at risk in the range of Tangjiao No.1 landslide and the generated wave

      承灾体类型 房屋建筑(元/m2) 道路(元/m2) 耕地(元/m2) 林地(元/m2) 码头(万元) 驳船(万元)
      1 2 3 4 5 6
      单价 2 000 60 5 15 40 80 20 20 10 10 300
      下载: 导出CSV
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    • 收稿日期:  2017-12-20
    • 刊出日期:  2018-03-15

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