由削坡建房遗留的人工边坡存在大量滑坡隐患问题,在降雨引发土质边坡自身动力变化分析条件下,以稳定性评价建模为基础,提出降雨型滑坡动力学预警预报模型。文中以广东省梅州市花岗岩地区为例,使用GIS技术构建了1 727个预警分析单元,并进行关键地质环境因子赋值及与气象站点数据关联;按坡高、坡度等参数,分别构建16个边坡失稳动力学预警模块,并根据降雨量变化,计算边坡稳定性系数,最终按其阈值确定风险等级并予以预警。本研究对于推动人工边坡诱发的滑坡地质灾害预警预报与预防均具有重要意义。
There are a lot of hidden dangers of landslides on the artificial soil slopes left behind by cutting slopes for building houses in low mountain and hill areas. Under the conditions of analyzing the dynamic changes of the soil slopes caused by rainfall, this paper proposes a rainfall-induced landslide dynamical early warning and forecasting model based on the stability evaluation modeling. Taking the granite area of Meizhou, Guangdong Province as an example, this paper uses GIS technology to construct 1 727 early warning analysis units, assigns key geological environmental factors, and associates with meteorological station data; 16 slopes are constructed according to the slope height, slope, and other parameters. On this basis, the instability dynamics early warning module calculates the slope stability coefficient according to the rainfall changes and finally determines the early warning risk level according to thresholds. This research is of great significance for promoting the early warning, forecasting, and prevention of landslide geological hazards induced by artificial soil slopes.
2021,42(2): 65-71 收稿日期:2021-02-18
DOI:10.3969/j.issn.1003-3246.2021.02.007
基金项目:广东省自然资源厅科技项目(项目编号:GDZRZYKJ2020002)
作者简介:鲍伟佳,男,博士,工程师,主要从事地质灾害预警预报及地质灾害防治工作。E-mail:196405950@qq.com
参考文献:
丛威青,李铁锋,潘懋,等. 基于非饱和渗流理论的区域降雨型地质灾害动力学预警方法研究[J]. 北京大学学报(自然科学版),2008,44(2):50-54.
丁伟翠,杨强,王爱军,等. 应用GIS技术对甘肃省灵台县地质灾害气象预警的研究[J]. 中国地质,2010,37(4):367-375.
李媛,孟晖,董颖,等. 中国地质灾害类型及其特征——基于全国县市地质灾害调查成果分析[J]. 中国地质灾害与防治学报,2004,15(2):32-37.
林春泽,王宁涛,王清,等. 降雨型滑坡地质灾害预警预报研究进展[J]. 暴雨灾害,2018,37(5):3-10.
刘艳辉,刘传正,温铭生,等. 中国地质灾害气象预警模型研究[J]. 工程地质学报,2015,23(4):152-160.
曾洲,郑志文,张伟. 残积土地区不同削坡角度边坡稳定性研究[J]. 山西建筑,2019,45(13):52-53.
朱昳橙,李益敏,魏苏杭. 怒江州滑坡地质灾害气象预警模型研究[J]. 云南大学学报(自然科学版),2016,38(4):102-111.
Genuchtenv Th m. A Closed-form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils1[J]. Soil Science Society of America Journal, 1980, 44(5): 892-898.