[1]苏添金,洪儒宝,简文彬.覆盖型岩溶土洞致灾过程的数值模拟与预测[J].自然灾害学报,2018,(05):179-187.[doi:10.13577/j.jnd.2018.0520]
 SU Tianjin,HONG Rubao,JIAN Wenbin.Numerical simulation and prediction of covered karst collapse[J].,2018,(05):179-187.[doi:10.13577/j.jnd.2018.0520]
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覆盖型岩溶土洞致灾过程的数值模拟与预测
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
期数:
2018年05期
页码:
179-187
栏目:
出版日期:
2018-10-28

文章信息/Info

Title:
Numerical simulation and prediction of covered karst collapse
作者:
苏添金1 洪儒宝124 简文彬123
1. 福州大学 环境与资源学院, 福建 福州 350108;
2. 地质工程福建省高校工程研究中心, 福建 福州 350108;
3. 福建省水土流失遥感监测评估与灾害防治重点实验室 (福州大学), 福建 福州 350002;
4. 福建省地质环境监测中心, 福建 福州 350001
Author(s):
SU Tianjin1 HONG Rubao124 JIAN Wenbin123
1. College of Environment and Resources, Fuzhou University, Fuzhou 350108, China;
2. Institute of Geotechnical and Engineering Geology of Fuzhou Province, Fuzhou 350108, China;
3. Fujian Provincial Key Laboratory of Remote Sensing of Soil Erosion and Disaster Prevention(Fuzhou University), Fuzhou 350002, China;
4. Fujian Center of Geo-Environmental Monitoring, Fuzhou 350001, China
关键词:
岩溶塌陷致塌机理力学模型塌陷系数地下水位预测评价
Keywords:
karst collapsecollapse mechanismmechanical modelcoefficient of collapseunderground water levelprediction and evaluation
分类号:
TU4;X43
DOI:
10.13577/j.jnd.2018.0520
摘要:
以福建永定樟坑自然村岩溶塌陷为研究对象,在野外调查的基础上结合研究区地质环境特征和工程地质资料,归纳总结了岩溶塌陷的致塌机理,采用莫尔-库仑准则建立了考虑了负压作用、地下水浮托力和动压力、降雨入渗作用的力学模型,通过极限平衡理论进行土洞稳定性评价,同时采用有限差分软件FLAC3D模拟了地下水位下降条件下岩溶土洞的发育过程。研究结果表明,福建永定樟坑自然村岩溶塌陷成因机制以渗流潜蚀作用为主;岩溶塌陷系数K与地下水位差呈线性关系,地下水位变化幅度越大,K值降低越多;地下水位变幅、气压差、降水强度三个因素对樟坑岩溶土洞塌陷的影响方面,地下水位下降对岩溶塌陷所起的作用最大;研究区岩溶塌陷主要由于周边矿山采矿过度抽水、地下水位落差过大导致。
Abstract:
Taking the karst collapse in Zhangkeng Village of Yongding County in Fujian province as the research object, the mechanism of karst collapse was summarized based on field investigation with the geological environment features and geotechnical data. Furthermore, the mechanical model considering negative pressure, buoyancy and dynamic pressure of underground water as well as rainfall infiltration was built by using the Mohr-Coulomb criterion. The stability analysis of the cave was carried out by the limit equilibrium theory, and the finite difference software FLAC3D was used to simulate the developing process of karst collapse. The research results show that the collapse mechanism of the karst collapses occurred in Zhangkeng Village of Yongding County, Fujian province is seepage erosion and the coefficient of collapse is proportional to the underground water level. The decrease of underground water level occupies an important position to the cause of karst collapse in comparison with pressure difference and precipitation intensity. The karst collapses are mainly caused by the excessive drainage of the surrounding mine, which induced rapid decline in groundwater level and strong suffosion.

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备注/Memo

备注/Memo:
收稿日期:2017-11-18;改回日期:2018-05-03。
基金项目:福建省科技厅科技重大专项(2016YZ0002-1)
作者简介:苏添金(1994-),男,硕士研究生,主要从事地质灾害研究.E-mail:stj_lucky@163.com
通讯作者:洪儒宝(1982-),男,工程师,博士研究生,主要从事地质灾害防治研究.E-mail:hrbx@163.com
更新日期/Last Update: 1900-01-01