基于Massflow模型的某弃渣场溃决运动特征及危险评价
CHARACTERISTICS OF OUTBURST MOVEMENT AND RISK ASSESSMENT OF A SLAG DUMP BASED ON MASSFLOW MODEL
孟宪森 1石豫川 1王璟玉 2魏松 1吕丰1
作者信息
- 1. 成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都 610059
- 2. 中国电建集团华东勘察设计研究院有限公司,杭州 311122
- 折叠
摘要
弃渣场是一个具有高势能、物源量大的危险源,一旦发生溃决运动,会对下游公共安全造成严重威胁.本次研究选取某沟谷弃渣场为研究对象,在现场调查和试验基础上,建立高精度三维模型.依据稳定性计算成果,弃渣体在极端情况下的失稳规模约 19×104 m3,运用 Massflow模拟弃渣体的溃决泛滥范围、监测点处流速和流深以及危险性分区.研究表明:溃决运动共持续 300 s,溃决运动主要沿沟道主沟滑动,主滑方向的平均厚度约 2.94 m,最大泛滥距离约 270 m,溃后龙头处距离两处村落分别为231 m和 379 m;监测点处速度显示,溃决运动速度具有突然增加,然后逐渐减少的趋势,整个溃决运动分为启动加速、稳定蠕滑和减速堆积 3 个阶段;溃后危险性分区表明,低、中、高风险区占比分别为49.32%、25.64%、25.64%,对居民区无明显影响.研究成果可分析弃渣场溃决运动路径、泛滥范围及运动速度特征等,对降低弃渣场溃决风险和应急响应具有重要指导意义.
Abstract
The spoil field represents a man-made hazardous source with significant potential energy and a large amount of material.Once an outburst movement occurs,it poses a severe threat to downstream residents,engineering facilities,and the ecological environment.In this study,a specific slag dump was selected as the research subject,and a highly precise three-dimensional model of the study area was established based on field investigations.The stability calculations indicated that the waste slag body could reach an instability scale of approximately 190 000 m3 in extreme scenarios.To simulate the outburst flood range,flow velocity,flow depth,and risk zoning under these conditions,Massflow was utilized.The findings revealed that the outburst movement lasted for 300 seconds.The primary direction of the outburst movement followed the main gully of the dump,with an average thickness of approximately 2.94 m.The maximum flooding distance was approximately 270 m,and the distances between the outburst source and two nearby villages were measured at 231 m and 379 m,respectively.The velocity at the monitoring point exhibited a sudden increase followed by a gradual decrease,and the entire outburst movement was categorized into three stages:starting acceleration,stable creep,and deceleration accumulation.Furthermore,the risk zoning analysis conducted after the collapse indicated that the proportions of low,medium,and high-risk areas were approximately 49.32%,25.64%,and 25.64%,respectively.Importantly,no significant impact on residential areas was observed.The research outcomes provide valuable insights for analyzing the movement paths,flooding ranges,and velocity characteristics of spoil dumps,thus guiding efforts to reduce the risks associated with spoil dumps and enabling effective emergency response.
关键词
弃渣场/溃决运动特征/Massflow/数值模拟Key words
spoil field/outburst movement characteristics/Massflow/numerical simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据