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学习笔记|尾矿库溃坝特征、致灾模式和后果有哪些?

  • 2026-05-28 21:37:31
学习笔记|尾矿库溃坝特征、致灾模式和后果有哪些?

聚焦岩理,守护安全。

尾矿库溃坝并非单一维度的工程失效,而是内部结构性缺陷与外部极端荷载多因素耦合引发的系统性灾难,其核心特征表现为渐进伴突发的破坏演化模式、极具毁灭性的次生环境链式反应以及难以精准预测的运动不确定性。

1 致灾机理:多因素耦合与渐进伴突发演化

尾矿库溃坝的致因机制具有高度的复杂性,往往不是单一因素作用的结果,而是工程设计缺陷、施工技术不达标、运营管理不规范以及自然与社会因素共同作用的产物[1]。这种多因素耦合效应显著削弱了系统的稳定性,导致事故防控难度极大。

从破坏过程的时间维度来看,尾矿库溃坝呈现出显著的渐进突发性相伴的特征。

(1)渐进性阶段

在溃决发生前,坝体通常经历较长的渗透变形萌芽、发展期。表现为散浸、液化、局部流土破坏以及深层滑动面的缓慢发展,这一过程可能持续较长时间,期间坝体内部孔隙水压力逐渐累积[2][3]

(2)突发性阶段

当变形累积形成贯穿性裂缝,或遭遇极端降雨等外部荷载导致坝体内孔隙水压力骤变时,坝体强度急剧降低,瞬间由局部破坏转变为整体溃决[2][3]。这种量变到质变的临界点往往难以捕捉,使得溃坝具有极强的突发性。

2 致灾模式:排渗失效与结构失稳的典型路径

基于既有事故案例与模型试验,尾矿库溃坝主要存在以下典型致灾模式:

表1 尾矿库溃坝典型的致灾模式、关键特征与典型诱因
致灾模式
关键特征
典型诱因
渗透破坏型
排渗设施失效导致浸润线抬升,引发局部流土→ 坝体累计变形→ 深层滑动面贯通 → 整体突发失[3]
防排渗系统功能缺陷、极端降雨诱发孔隙水压力骤变[1][3]
洪水漫顶型
超设防标准洪水漫过坝顶,水力冲刷导致溃口形成并迅速扩展,最终形字形溃口,两侧坝体滑塌[4]
气象预报偏差、排水能力不足、防洪设施失效[4]
结构缺陷型
坝体内部存在薄弱环节(如软弱夹层、施工缺陷),在长期荷载或地震等外部作用下发生深层滑动[5]
设计缺陷、施工质量不达标、长期运营维护缺失[1][6]
其中,孔隙水压力骤变被证实是坝体发生滑动破坏的关键响应指标,可作为溃决事故的前兆信息[3]
3 灾害后果:系统性、持久性与不可逆的生态灾难

尾矿库溃坝释放的尾矿浆本质上是高势能的人工泥石流,其造成的次生环境危害具有系统性、持久性和不可逆性

3.1 水体污染链式反应

尾矿浆携带的重金属(AsCdPb等)、氰化物及酸性物质进入水体后,引发链式生态灾难。例如,巴西Brumadinho溃坝事故导致下游300 km河段水质恶化,水生生态系统遭受毁灭性打击[1]

3.2 土壤功能永久丧失

溃坝泥流沉积物覆盖导致土壤结构破坏、肥力丧失,并引入高浓度重金属,使受污染土地长期丧失农业和生态功能,即便在非溃坝状态下,渗漏也会恶化地下水质量,而溃坝则使污染范围呈数量级扩大[1]

3.3 人体健康长期威胁

污染物通过饮用水、食物链生物富集、气溶胶吸入等途径威胁人体健康,可能导致辐射毒性、器官损伤等长期影响,危害延续数十年[1]

4 运动特征:高势能转化与地形主导的演进规律

溃坝后的尾砂流运动具有高度的不确定性,其演进规律受地形、颗粒级配及流体性质多重影响:

4.1 三阶段演进

溃坝过程在时间上可划分为瞬时爆发阶段(流速急剧增加、形成高能冲击波)、持续冲刷阶段(流速缓慢下降)和衰弱稳定阶段(流速呈对数曲面递减)[4]

4.2 地形主导淹没范围

下游地形通过重力势能转化与路径约束主导泥流淹没范围。弯道处会导致流速明显下降并造成局部堆积深度增加,而溃坝泥流外泄量与坝高、库容呈正相关[4][6]

4.3 流态演变

初期尾砂流浆体中粗颗粒占比高,冲刷能力强;随着演进距离增加,细颗粒占比升高,表现出明显的宾汉流体特征,堆积厚度衰减幅度变小[4][6]。

尾矿库溃坝的本质是人工高势能体在多重风险因子叠加下的失稳释放,其渐进伴突发的破坏机理与系统性、持久性的生态后果,要求我们必须从全生命周期视角强化监测预警与应急治理,以阻断从隐患累积到灾难爆发的转化链条。

请在评论区给出您的见解吧!欢迎留言讨论。
参考文献

[1]黄如霞.福建省尾矿库溃坝次生突发环境事件应急治理研究[J].能源与环境,2025,(05):154-156+160.

[2]马文君.尾矿库溃坝灾变机理及监测预警技术研究[D].石家庄铁道大学,2025.

[3]张力霆,马文君,刘雅帆,.排渗失效下尾矿库溃坝三维模型试验研究[J].水利学报,2024,55(06):735-743.

[4]张明翀.尾矿库溃坝尾砂流的数值模拟和模型试验研究[D].南昌工程学院,2025.

[5]姜洲,黄艳华,吴贤国,.基于云模型和D-S证据理论的尾矿库失稳溃坝警情评价模型及应用[J].水电能源科学,2016,34(10):47-51.

[6]王昆,赵得源,诸利一,.尾矿库重大溃坝事故典型案例与特征分析[J].振动与冲击,2026,45(06):238-248.

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  1. CONNECT:[ UseTime:0.000590s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000912s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000315s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000249s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000502s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000499s ]
  8. SELECT * FROM `article` WHERE `id` = 491449 LIMIT 1 [ RunTime:0.000453s ]
  9. UPDATE `article` SET `lasttime` = 1779991862 WHERE `id` = 491449 [ RunTime:0.003989s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000248s ]
  11. SELECT * FROM `article` WHERE `id` < 491449 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000433s ]
  12. SELECT * FROM `article` WHERE `id` > 491449 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000371s ]
  13. SELECT * FROM `article` WHERE `id` < 491449 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000655s ]
  14. SELECT * FROM `article` WHERE `id` < 491449 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000604s ]
  15. SELECT * FROM `article` WHERE `id` < 491449 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002537s ]
0.081900s