【摘要】 库岸稳定分析一般假定材料参数为常量,与库水位升降时材料参数随饱和状态变化而变化的实际情况不符,计算精度受限,影响库岸安全评判。基于非饱和土力学理论与有效应力原理,定义材料参数为饱和度的函数,引入非饱和流固耦合模型进行库岸稳定数值分析。以小浪底库岸1#滑坡体为例,进行水位升降、降雨、地震等因素的影响分析,并与相关成果进行对比。研究表明:将材料参数定义为饱和度的函数时,可以更好地描述土体的湿化过程;非饱和流固耦合模型的分析结果与实际情况基本相符,该模型可用于库岸稳定分析;相对于极限平衡法而言,有限单元法可以考虑材料的本构关系,并能提供渗流、应力位移等信息,更适用于库岸稳定性分析。研究成果可供库岸安全评价与防治时参考。更多还原

【Abstract】 Generally,material parameters are assumed as constant in stability analysis of reservoir bank;it is inconsistent with the fact that material parameters would vary with change in saturation state as change in water level.The precision of calculation is limited;thus safety judgment of bank is influenced.Based on theory of unsaturated soil mechanics and principle of effective stress,not only material parameters are assumed as the function of saturation,but also the model of unsaturated liquid-solid coupling is introduced to numerical analysis of bank stability.Taking landslide No.1 at the bank of Xiaolangdi Reservoir for example,several works such as change in water level,rainfall,earthquake,etc.are carried out as well as the contrast of correlative results are worked out.Study shows that results of the model of unsaturated liquid-solid coupling are consistent with the fact basically;thus the model can be used to analyze the stability of reservoir bank.Moreover,material parameters defined as the function of saturation state,soak process of soil can be described better.Finally,relative to limit equilibrium method,not only constitute relation of stress and strain about material can be considered,but also results of seepage,stress,displacement,etc.can be achieved with the finite element method;thus it will be applicable to stability analysis of bank.The research results can be used as reference for safety evaluation and prevention and treatment of reservoir banks.更多还原