天然和暴雨条件下的物质点滑坡变形机制分析
投稿时间:2023-03-10  修订日期:2023-06-10  点此下载全文
引用本文:艾国栋,李云青,资丽君,等.天然和暴雨条件下的物质点滑坡变形机制分析[J].钻探工程,2023,50(5):23-28.
AI Guodong,LI Yunqing,ZI Lijun,et al. Analysis of deformation mechanism of landslide under natural and rainstorm conditions based on material point method[J]. Drilling Engineering, 2023,50(5):23-28.
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作者单位E-mail
艾国栋 湖南省矿产资源调查所湖南 郴州 423000 lubing168@126.com 
李云青 湖南省矿产资源调查所湖南 郴州 423000  
资丽君 湖南省矿产资源调查所湖南 郴州 423000  
梁昌奇* 中南大学有色金属成矿预测与地质环境监测教育部重点实验室湖南 长沙 410083
湖南省有色资源与地质灾害探查湖南省重点实验室湖南 长沙 410083
中南大学地球科学与信息物理学院湖南 长沙 410083 
changqiliang@csu.edu.cn 
基金项目:湖南省地质院科学项目“湖南省典型地灾成因及早期识别监测预警和防治工程应用研究”(编号:HNGSTP202106);湖南省安全生产预防及应急专项资金项目“强降雨诱发地质灾害链预测预警模式研究”(编号:2021YJ009)
中文摘要:为准确评估边坡失稳后对滑动路径上建筑物及人们生命财产的威胁程度,本文以郴州某滑坡为例,利用物质点法,分别模拟了天然和暴雨两种工况下该边坡在开挖后的大变形破坏机制,并计算了其滑动距离,并将结果与传统有限元分析进行了对比。结果表明:(1)开挖前,该边坡在天然工况下处于基本稳定状态,在暴雨工况下处于失稳状态,而开挖后,该边坡在两种工况下都处于失稳状态;(2)开挖后该滑坡的滑动距离显著增大,在天然工况和暴雨工况下的滑动距离分别为20.11和24.12 m;(3)对比稳定性分析和大变形分析结果可知,开挖和降雨是该边坡失稳的两种主要因素,计算边坡失稳后的滑动距离可为评估其对滑动路径上建筑物的威胁程度提供理论参考,对提高边坡安全性防护有重要意义。
中文关键词:边坡失稳  大变形分析  物质点法  滑坡  滑动距离
 
Analysis of deformation mechanism of landslide under natural and rainstorm conditions based on material point method
Abstract:In order to accurately evaluate the threat to buildings and people’s lives and properties in the run-out path after slope failure, this paper takes a landslide in Chenzhou as an example, simulates the failure mechanism of large deformation under natural and rainstorm conditions after excavation of this slope based on the material point method, calculates the run-out distance, and compares the results with the finite element method. The results show that: (1) Before excavation, the slope is basically stable under natural condition and unstable under rainstorm condition, while after excavation, the slope is unstable under both conditions; (2) The sliding distance of the landslide increases significantly after excavation, and the sliding distance under natural conditions and rainstorm conditions is 20.11 and 24.12m respectively; (3) By comparing the results of stability and large deformation analysis, it can be seen that excavation and rainfall are the two main factors causing slope instability. Calculating the sliding distance after slope instability can provide theoretical reference for evaluating the threat to buildings on the sliding path, and is of great significance for improving slope safety protection.
keywords:slope instability  large deformation analysis  material point method  landslide  sliding distance
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