摘要
寒区明渠在冬季冻害风险高,影响工程的长期运行安全以及耐久性和稳定性,准确、合理的冻害风险评估至关重要。通过对渠道冻害特征及类型的剖析,并结合现场调研、文献研究和专家咨询,从冻害主体、自然条件、监管与防控3个维度提出15个二级指标构成评价指标体系并对指标等级进行量化。采用改进G2-CRITIC法计算主客观权重,用最小信息熵原理(MIE)进行主客观组合赋权,选取TOPSIS模型确定渠道冻害指标值,最后结合相关规范以及工程实践确定冻害风险等级。以新疆北部某工程为原型,通过现场调查选取4个典型渠段,应用该模型进行冻害风险评估并对不同渠段进行障碍度因子诊断。结果表明:各渠段均存在不同程度冻害风险,评价等级均在Ⅱ级以上,部分渠段出现严重冻害,与实际基本相符。气象、土质条件及水分补给条件所占权重较高、影响较大,是渠道冻害的关键影响因素。不同渠段应结合承灾体自身特性、自然环境状况及监管防控因素进行综合分析,采取有效措施以降低渠道工程冻害风险。本研究可为寒区渠道冻害风险评估提供科学参考和理论依据。
Open canals in cold regions are prone to frost-heaving damage in winter,which affects the long-term safety,durability,and stability of the project.Accurate and reasonable risk assessment of frost-heaving damage is crucial to the safe operation of the project.In view of this,we analyzed the characteristics and types of canal frost-heaving damage and combined the information from field research,literature research and experts consultation,then selected 15 secondary indicators from 3 dimensions of frost-heaving damage subject,natural conditions,supervision and prevention to constitute an evaluation index system,by which each index was studied and quantified.Then,the subjective and objective weights of the indicies were calculated by the improved G2-CRITIC method,the subjective and objective weight combinations were assigned with the principle of minimum information entropy(MIE),and the values of canal frost-heaving damage indicies were calculated by TOPSIS model.Finally,the risk level was determined according to the relevant specifications and engineering practices.Taking a project in northern Xinjiang as a prototype,we selected four typical canal sections through a field survey,and applied the proposed model to the frost-heaving damage risk assessment and obstacle degree factor diagnosis for different canal sections.The results show that all the four canal sections are under different degrees of frost-heaving damage risk,which are evaluated to be gradeⅡor above,and some sections have serious frost-heaving damage,which is consistent with the actual situation.Weather,soil conditions and water recharge conditions are the key influencing factors of canal frost-heaving damage due to their high weight and great influence.It is suggested that different measures should be taken to reduce the risk of frost-heaving damage at different canal sections based on their own characteristics of disaster-bearing body,natural conditions,supervision and prevention.This study can provide scientific references and a theoretical basis for frost-heaving damage risk assessment of canals in cold regions.
作者
熊志豪
肖旻
吴浪
杨晓松
崔浩
XIONG Zhihao;XIAO Min;WU Lang;YANG Xiaosong;CUI Hao(School of Civil Engineering,Jiangxi Science&Technology Normal University,Nanchang 330013,China;Jiangxi Provincial Science Association Think Tank Disaster Prevention and Mitigation Engineering Technology Research Base,Nanchang 330013,China;College of Hydraulic and Architectural Engineering,Tarim University,Alaer 843300,China)
出处
《水资源与水工程学报》
CSCD
北大核心
2023年第6期173-181,共9页
Journal of Water Resources and Water Engineering
基金
国家重点研发计划重点专项(2017YFC0405100)
新疆生产建设兵团一师横向项目(SWJ2022KT23)
国家自然科学基金项目(51641903,51869029)
江西省教育厅科学技术研究项目(GJJ190621)
江西科技师范大学博士科研启动基金项目(2019BSQD11)。