基于深度积分法和不确定性分析的固废堆填土边坡失稳致灾风险定量评价:以深圳“12•20”光明滑坡为例
罗紫琪 , 刘磊磊 , 曾志雄 , 王涛 , 李建国 , 桑琴扬
地球科学 ›› 2025, Vol. 50 ›› Issue (12) : 4984 -4999.
基于深度积分法和不确定性分析的固废堆填土边坡失稳致灾风险定量评价:以深圳“12•20”光明滑坡为例
Quantitative Risk Assessment of Solid Waste Landfill Slope Instability-Induced Disasters Based on Depth-Integrated Method and Uncertainty Analysis:A Case Study of Shenzhen’s “12•20” Guangming Landslide
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城市固废堆填形成的高陡边坡突发失稳常伴随大量建筑损毁和人员伤亡等灾害.为定量评估人工堆填滑坡的致灾风险,以深圳“12•20”光明滑坡为典型案例,采用基于深度积分法的Massflow软件构建动态数值模型,再现了滑坡失稳启动、高速运动及堆积的演进全过程.通过耦合滑坡物质冲击压力计算方法,定量评估了滑坡运动体对周边建筑物的冲击破坏效应,进而引入不确定性分析框架,将岩土体参数及滑动面特性视为随机变量,通过拉丁超立方抽样构建概率分析模型,揭示了多重因素影响下滑坡运动距离的统计特征,并建立了滑坡运动超越概率与建筑物冲击破坏效应间的关联模型.在此基础上,考虑承灾体易损性,对建筑物及其附近人员进行风险评价.研究结果表明:深度积分法有效捕捉了滑坡的动态演化特征,模拟所得滑裂面形态、运动距离(1 139 m)及堆积形态与实际监测数据高度吻合;滑坡运动物质对建筑物的冲击压力呈现先快速增大至峰值后逐渐衰减的规律,且峰值压力随距滑坡后缘距离增加而显著减小;通过基于参数不确定性的滑坡运动距离超越概率分析,实际堆积范围完全落于计算所得95%置信区间内,建筑物损毁区域与危险性区划结果高度匹配.本研究提出的耦合深度积分法与不确定性分析的承灾风险评价框架,为人工堆填滑坡的定量风险评估提供了新方法,对“无废城市”建设中的固废堆填安全保障具有重要理论价值与实践意义.
Urban solid waste landfill-induced high-steep slope instability often leads to secondary disasters such as extensive building destruction and casualties. To quantitatively evaluate the disaster risk of artificial landfill landslides, this study takes Shenzhen’s “12•20” Guangming landslide as a case study, employing the depth-integrated method-based Massflow software to construct a dynamic numerical model that reproduces the entire evolution process of landslide initiation, high-speed movement, and deposition. By coupling with impact pressure calculation methods for landslide masses, the destructive impact effects on surrounding buildings were quantitatively evaluated. An uncertainty analysis framework was introduced, treating geotechnical parameters and sliding surface properties as random variables. A probabilistic analysis model was developed through Latin hypercube sampling, revealing the statistical characteristics of landslide travel distance under multifactorial influences and establishing a correlation model between landslide motion exceedance probability and building impact damage. Building vulnerability was further considered when conducting risk assessments for structures and nearby personnel. The study demonstrates that the depth-integrated method effectively captures the dynamic evolution of landslides, with simulated failure surface morphology, travel distance (1 139 m), and deposition pattern highly consistent with field monitoring data; impact pressure from landslide masses on buildings exhibits a rapid rise to peak values followed by gradual attenuation, with peak pressure decreasing significantly with distance from the landslide source; probabilistic analysis of landslide travel distance based on parameter uncertainty shows the actual deposition zone entirely falls within the 95% confidence interval, and building damage areas align with hazard zoning results. The proposed risk assessment framework integrating depth-integrated modeling and uncertainty analysis provides a novel methodology for quantitative evaluation of engineered landfill landslides, offering significant theoretical and practical implications for solid waste landfill safety management in the context of “zero-waste city” development.
风险定量评价 / 固废堆土 / 光明滑坡 / 深度积分法 / 不确定性分析 / 工程地质.
quantitative risk assessment / solid waste stockpile / Guangming landslide / depth-averaged method / probabilistic uncertainty analysis / engineering geology
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国家自然科学基金(42577213)
湖南省地质灾害监测预警与应急救援工程技术研究中心开放课题(HECGD202501)
湖南省教育厅重点项目(23A0015)
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