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工程科学与技术:2022,54(3):36-45
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基于两相双质点MPM的滑坡堵江灾害链生全过程分析
(1.中国科学院 武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071;2.中国科学院大学,北京 100049;3.云南交投集团公路建设有限公司,云南 昆明 650100;4.湖北省地质局第八地质大队,湖北 襄阳 441000)
Chain Generation Process of Landslide Blocking River Based on Two-phase Double-point Material Point Method
(1.State Key Lab. of Geomechanics and Geotechnical Eng., Inst. of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;2.Univ. of Chinese Academy of Sciences, Beijing 100049, China;3.Yunnan Communications Investment Group Highway Construction Co. Ltd., Kunming 650100, China;4.Eighth Geological Brigade of Hubei, Xiangyang 441000, China)
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投稿时间:2021-11-12    修订日期:2022-02-25
中文摘要: 滑坡—堵江—堰塞湖灾害链是高山峡谷地区的典型地质灾害,其中,滑坡堵江环节作为该灾害链的衔接过程,往往决定了后续灾害在时间、空间上的延拓规模,合理再现这一复杂流–固耦合过程对于灾害链风险评估至关重要。本文基于物质点法(MPM)模拟岩土材料非线性的优势,采用Drucker–Prager模型表征失稳运动的岩土体,引入人工状态方程表征水体流动过程,发展了岩土体(固相)与水体(液相)相互作用的两相双质点物质点法(TPDP–MPM);通过模型试验尺度下滑坡体–水体相互作用过程的仿真分析,验证了TPDP–MPM处理岩土体、水体两相耦合的有效性。以此为基础,针对2011年湖北十堰市二荒村滑坡堵江(平渡河)灾害链,再现了灾害演化全过程;通过演化过程中的速度场与动能分析,认为二荒村滑坡堵江全过程可分为失稳启动、高速滑动、入江制动和堆积成坝4个阶段,揭示了滑坡体在失稳启动和高速滑动阶段的运移模式及入水制动阶段水体对于滑坡堆积过程的影响规律。研究成果可为滑坡堵江灾害链全过程的推演与风险评估提供理论支撑与方法。
Abstract:The landslide—blocking river—dammed lake disaster chain is a typical disaster in mountain and gorge areas. The interaction between landslides and rivers, as the linking process in this disaster chain, often determines the scale of continuation of subsequent disasters in time and space. It is critical to reproduce the complex fluid-solid coupling process in the assessment of the landslide-blocking river disasters. By using the Drucker–Prager model to simulate the sliding of the landslide body, along with an artificial equation of state to model the flow of water, the two-phase double-point material point method (TPDP–MPM) program was developed. The simulation of the landslide-water body interaction process on an experimental scale was conducted and verified the reliability of TPDP–MPM in multiphase coupling problems. On this basis, a landslide—dammed lake disaster chain, namely the Pingdu River being blocked by the Erhuang Village landslide, Shiyan City, Hubei in 2011, was reproduced by the TPDP–MPM program. According to the TPDP–MPM simulation results, this disaster could be divided into four stages: unstable initiation, high-speed sliding, river braking, and accumulation. Based on the velocity field of the landslide mass and the evolution of the kinetic energy, the sliding pattern of the Erhuang Village landslide and the mechanism of river braking were revealed. The research results provided a theory and method for the whole process analysis and risk assessment of the landslide—dammed lake disaster chain.
文章编号:202101133     中图分类号:P642.22;O241    文献标志码:
基金项目:国家自然科学基金项目(52179117;U21A20159);中国科学院青年创新促进会项目 (2021325);中国科学院国际合作项目(131551KYSB20180042)
作者简介:第一作者:杜文杰(1995—),男,博士生. 研究方向:地质灾害数值模拟与评估. E-mail:duwenjie18@mails.ucas.ac.cn;通信作者:付晓东, E-mail:xdfu@whrsm.ac.cn
引用文本:
杜文杰,盛谦,杨兴洪,魏鹏飞,李丽华,付晓东.基于两相双质点MPM的滑坡堵江灾害链生全过程分析[J].工程科学与技术,2022,54(3):36-45.
DU Wenjie,SHENG Qian,YANG Xinghong,WEI Pengfei,LI Lihua,FU Xiaodong.Chain Generation Process of Landslide Blocking River Based on Two-phase Double-point Material Point Method[J].Advanced Engineering Sciences,2022,54(3):36-45.