[1]熊绍真,史文兵,彭雄武,等.基于离散元的普洒崩塌过程分析研究[J].自然灾害学报,2022,31(05):202-211.[doi:10.13577/j.jnd.2022.0523]
 XIONG Shaozhen,SHI Wenbing,PENG Xiongwu,et al.Study on the Pusa collapse process based on discrete element method[J].,2022,31(05):202-211.[doi:10.13577/j.jnd.2022.0523]
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基于离散元的普洒崩塌过程分析研究
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
31
期数:
2022年05期
页码:
202-211
栏目:
出版日期:
2022-10-28

文章信息/Info

Title:
Study on the Pusa collapse process based on discrete element method
作者:
熊绍真13 史文兵12 彭雄武2 王勇1
1. 贵州大学 资源与环境工程学院, 贵州 贵阳 550025;
2. 贵州大学 教育部喀斯特地质资源与环境重点实验室, 贵州 贵阳 550025;
3. 江西省地质局水文地质大队, 江西 南昌 330000
Author(s):
XIONG Shaozhen13 SHI Wenbing12 PENG Xiongwu2 WANG Yong1
1. Resources and Environmental Engineering Department, Guizhou University, Guiyang 550025, China;
2. Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China;
3. Hydrogeological Brigade of Jiangxi Provincial Geological Bureau, Nanchang 330000, China
关键词:
崩塌地下开采3DEC变形破坏失稳
Keywords:
collapseunderground mining3DECdeformation damageinstability
分类号:
P642.22;X43
DOI:
10.13577/j.jnd.2022.0523
摘要:
崩塌一旦发生,往往带来严重的生命财产损失。2017年8月28日10时30分左右贵州省纳雍县张家湾镇普洒村发生了灾难性的高位崩塌地质灾害,摧毁了普洒村居民区房屋,还有26人遇难,9人失踪,8人受伤。查明崩塌的基本特征及现场工程地质条件变得尤为重要,有利于找出诱发崩塌的关键性因素,分析崩塌的形成机制及运动过程,为此类灾害防治及早期识别提供理论依据。文中通过现场调查、无人机航拍、现场视频和已有地质资料查明斜坡工程地质条件、斜坡特征,分析崩塌运动过程,采用3DEC离散元数值模拟方法,对高陡斜坡在地下开采作用下崩塌所产生的机理、失稳模式、运动轨迹进行了全过程模拟,并将数值模拟结果与崩塌实际过程进行对比。结果表明:通过3DEC模拟地下开采诱发的崩塌过程,发现斜坡在地下开采的扰动下会产生大规模的崩塌。普洒崩塌的主要过程为:(1)煤矿的开采过程中,斜坡受到扰动,加剧岩体产生变形,上覆岩体出现开裂塌陷现象,坡顶出现拉裂缝;(2)采空区形成后,整个坡体出现不均匀沉降,裂缝进一步向下扩展,岩体破碎趋向临空面倾倒,开始脱离坡表,形成崩塌;(3)坡顶岩体变形剧烈,斜坡整体失稳,发生大规模崩塌;(4)崩塌块体间冲击-铲刮作用,崩塌体以高速碎屑流的方式向下滑动,并堆积于坡脚前缘。
Abstract:
Collapses often result in serious loss of life and property. At 10: 30 on August 28,2017,a catastrophic high-level collapse geological disaster occurred at Pusa village in Zhangjiawan Town,Nayong County,Guizhou Province,destroying houses in residential areas of Pusan Village,killing 26 people,leaving 9 missing and injuring 8 people. It is very important to find out the basic characteristics of collapse and the on-site engineering geological conditions,which is helpful to find out the key factors that induce collapse and analyze the formation mechanism and movement process of collapse. Accordingly, it can provide theoretical basis for the prevention and early identification of such disasters. In this paper,the engineering geological conditions and characteristics of slopes are identified by field investigation,aerial camera of UAV,video and existing geological data,and the collapse process is analyzed. The mechanical mechanism,instability mode and motion trajectory of high steep slope under mining are simulated by 3DEC discrete element numerical simulation and the numerical simulation results are compared with the actual process of collapse. The results show that 3DEC software can simulate the collapse process induced by underground mining,and it is found that the slope will produce large-scale collapse under the disturbance of underground mining. The main process of the collapse is as follows: (1)during the process of coal mining,the slope is disturbed,which aggravates the deformation of rock mass. Consequently,cracks and collapses of the goaf occur in the overlying rock mass,and tension cracks occur on the crest of the slope.(2)After the deformation of the goaf,the entire slope appears uneven settlement,the cracks further expand downward,the rock mass tends to collapse towards the free face,and starts to break away from the slope surface,thus forms collapse.(3)The rock mass at the crest of the slope is deformed dramatically,the slope is unstable and large-scale collapse occurs.(4)The impact scraping action among collapse blocks makes the collapse body slide downward which shortly leading to high-speed debris flow and accumulate at the front edge of the toe of the slope.

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备注/Memo

备注/Memo:
收稿日期:2021-6-8;改回日期:2021-10-8。
基金项目:国家自然科学基金项目(42067046, 42007271); 贵州省科技计划项目(黔科合基础-ZK [2021] 一般228)
作者简介:熊绍真(1996-),男,硕士研究生,主要从事地质灾害研究.E-mail:1330548705@qq.com
通讯作者:史文兵(1980-),男,教授,博士,主要从事地质灾害研究.E-mail:wbshi@gzu.edu.cn
更新日期/Last Update: 1900-01-01