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复杂条件下库岸边坡变形破坏机理及防护

项目来源

国家自然科学基金(NSFC)

项目主持人

李建林

项目受资助机构

三峡大学

项目编号

51439003

立项年度

2014

立项时间

未公开

研究期限

未知 / 未知

项目级别

国家级

受资助金额

381.00万元

学科

工程与材料科学-水利工程-水工岩土工程

学科代码

E-E09-E0905

基金类别

重点项目

关键词

防护技术 ; 试验 ; 破坏机理 ; 库岸边坡 ; 复杂条件 ; reservoir bank slope ; complex conditions ; experiment ; failure mechanism ; protection technology

参与者

许文年；易庆林；王乐华；邓华锋；王孔伟；刘杰；郭永成；王瑞红；李新哲

参与机构

三峡大学

项目标书摘要：库岸边坡在复杂条件下的变形破坏将造成人员伤亡和财产损失，库岸边坡变形破坏机理及其防护是岩土力学与岩土工程研究的重要课题。本项目以三峡库区蓄水以来发生明显变形破坏迹象的库岸边坡为研究对象，以库水、暴雨、冰雪融水、水库地震等复杂条件为主要致灾因素，综合采用地质分析、室内试验、现场试验、室内大型滑坡模型试验以及数值模拟等方法，结合库区十余年的监测资料，开展库岸边坡地质环境演化、岩土体损伤劣化力学特性、边坡变形破坏机理、库岸边坡重大危险性地质灾害风险决策及防护体系等问题研究，建立典型库岸段内边坡动态演化地质模型；揭示复杂条件下岸坡岩土体力学特性与损伤演化规律；掌握典型库岸边坡渗流场、应力场、位移场的变化规律；揭示库岸边坡变形破坏机理，建立变形破坏演化模型；基于库岸边坡地质灾害风险决策体系，构建经济实用的库岸边坡新型支挡结构体系，集成工程防护与生态防护新技术。研究成果具有重要的理论与工程应用价值。

Application Abstract: As the deformation failure under complex conditions of a reservoir bank slope may cause casualties and property losses,the research of the failure mechanism and protection is one of the important topics in rock and soil mechanics and geotechnical engineering.Taking reservoir bank slopes of the Three Gorges reservoir region as the study object,which have been obviously damaged in the storage period,combing with the monitoring data in a dozen years and adopting the methods of geological analysis,laboratory and field experiments,large-scale landslide model tests and numerical simulations comprehensively,this project will carry out researches on the geological evolution form,damage degradation mechanical properties of rock and soil,deformation mechanism,geology disaster risk assessment system under great danger and protection technology development and build a geologic model reflecting the dynamic evolution situation according to the typical bank slope by considering complicated conditions including reservoir water,rainstorm,snow melt-water and reservoir earthquakes as main disaster factors.It will also reveal the rock mechanics characteristics and damage evolution under complex conditions,obtain the variation rules of seepage field,stress field and displacement field of typical bank slope,set up the bank slope deformation damage evolution model according to its deformation mechanics.On the basis of dynamic risk assessment system for geological disasters of significant risk in the bank slope,a new economic and practical bank slope retaining structure system will be built,with new engineering and ecological protection techniques integrated into it.The research results have important value in theory and engineering applications.

项目受资助省

湖北省

项目结题报告

复杂条件下库岸边坡变形破坏机理及防护结题报告(全文)

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  • 1.Study on the unloading damage constitutive model of sandstone based on hydro-pressure cycle

    • 关键词：
    • Energy dissipation;Reservoirs (water);Stress-strain curves;Deterioration;Slope stability;Weibull distribution;Water levels;Fracture mechanics;Constitutive models;Unloading;Comparative analysis;Damage constitutive equation;Experimental curves;Hoek-Brown strength criterion;Macroscopic strength;Physical and mechanical properties;Reservoir water level;Saturated sandstones
    • Yongcheng, G.U.O.;Yan, Sima;Jianlin, L.I.;Zuogui, Chen;Qinglin, Xiao;Bin, Y.A.N.
    • 《China Rock 2020 Conference》
    • 2020年
    • October 23, 2020 - October 26, 2020
    • Beijing, China
    • 会议

    The periodic rise and fall of reservoir water level under hydro-pressure cycle leads to the deterioration of physical and mechanical properties of rock and seriously triggers the instability of the reservoir slope. From the laboratory data and characteristics of the stress-strain curve under different hydraulic cycles, combined with the generalized Hookes law, the Weibull distribution theory, and the Hoek-Brown strength criterion, the energy dissipation in the unloading process is assumed as the damage variable, and the unloading damage constitutive model of saturated sandstone under hydro-pressure cycle is established. Under hydro-pressure cycle, the parameters m and F of the constitutive model are gradually decreasing, and the sandstone brittleness and macroscopic strength are gradually weakened. In addition, the scattered energy increases, while plastic deformation slowly plays a dominant role. The comparative analysis shows that the constitutive model fits well with the experimental curves. The damage constitutive equation can be expressed under hydro-pressure cycle. This research can help in the stability analysis of rock slope under the reservoir water in the field. © Published under licence by IOP Publishing Ltd.

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