基于P-Z模型的土石坝湿化变形特性反演理论与方法研究

The slaking deformation is an important factor to affect the safe operation problem of earth-rockfill dam during the impounding period. Because of uncertainty of the slaking characteristics, there is a big difference between calculating results and measured results in practical engineering by using slaking deformation calculation model has been established. In view of this, using the methods of "materials test - numerical analysis - characteristics inversion", and based on the P-Z constitutive model and the cloud theory, and by means of conventional the triaxial test and the slaking deformation test, combined with parameter sensitivity analysis and finite element analysis, the slaking deformation mechanism and influencing factors will be studied, and the characteristic parameters will be obtained, and the coupling uncertainty analysis model considering fuzziness and randomness of slaking deformation characteristics will be established to explore the cloud distribution of slaking deformation characteristics in earth-rockfill dam. According to the measured data, the cloud reasoning algorithm will be constructed, by which the inversion analysis on current actual slaking deformation characteristics of earth-rockfill dam will be carried out, which will provide theoretical basis for the health diagnosis and the optimization design of earth rockfill dam, and can also provide decision basis and technical support for safe operation of earth-rockfill dam.

土石坝材料的湿化变形是影响土石坝蓄水期安全运行的重要因素。针对目前已建立的湿化变形计算模型没有考虑湿化特性的不确定性，导致应用于实际工程与实测结果常常存在较大差异的问题，本项目拟采用“材料试验-数值分析-特性反演”的方法，以基于广义塑性力学理论的P-Z本构模型和考虑不确定性的云理论为基础，通过土石坝材料常规三轴试验及湿化变形试验，结合参数敏感性分析和有限元分析，研究土石坝材料湿化变形的机理及影响因素，确定湿化变形特性参数及其云分布情况，建立考虑模糊性、随机性以及二者关联性等不确定性因素的土石坝湿化变形多要素耦合分析模型，实现基于云推理模型的土石坝湿化变形特性的反演。研究可为土石坝的优化设计和健康诊断提供理论依据，又可为土石坝的安全运行提供决策依据和技术支撑。

土石坝在施工期及运行期变形是保障土石坝安全运行的重要影响因素。针对目前已建立的土石坝变形计算模型在本构模型参数确定上具有较多的不确定性，对蓄水期湿化变形特性的研究不够深入，导致应用于实际工程与实测结果常常存在较大差异的问题，本项目采用了“材料试验-数值分析-特性反演”的方法，引入了广义塑性力学模型，设计并进行了土石坝材料的三轴试验，并针对模型未考虑出实密实度和围压的问题进行了修正；引入考虑不确定性的云理论，通过土石坝材料常规三轴试验及湿化变形试验，结合参数敏感性分析，研究土石坝材料湿化变形的机理及影响因素，确定湿化变形特性参数及其云分布情况，建立了考虑模糊性、随机性以及二者关联性等不确定性因素的土石坝变形多要素耦合分析模型，实现基于云推理模型的土石坝变形特性的反演。研究为土石坝的优化设计和安全运行提供决策依据和技术支撑。