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如何准确确定原级配堆石体的力学参数是高堆石坝建设中亟待解决的一个关键问题,参数反演是解决这一问题的可行方法之一,传统的参数反演方法因需要进行大量的有限元正分析,其计算工作量大,反演效率较低。响应面法可以有效克服以上问题,但已有方法仅针对堆石体的瞬变参数,未考虑流变参数,不能满足堆石坝长期变形预测的需要。综合考虑瞬变和流变参数,通过构造更加合理的响应面函数,提出了基于响应面法的高堆石坝瞬变-流变材料参数反演方法,大大提高了反演的效率和精度。以水布垭面板堆石坝为例,采用该方法对坝体瞬变和流变参数进行了反演分析。反演结果表明,计算值与实测值在数值和变化规律上总体符合较好,反演结果合理可靠且更加高效。
How to accurately determine the mechanical parameters of the original graded rockfill is a key issue that urgently needs to be solved in the construction of the high rockfill dam. Parameter inversion is one of the feasible methods to solve this problem. The traditional method of parameter inversion requires a large amount of The finite element analysis, the computational workload, low inversion efficiency. The response surface method can effectively overcome the above problems. However, the existing methods only focus on the transient parameters of the rockfill body, and the rheological parameters are not taken into account, which can not meet the needs of the long-term deformation prediction of the rockfill dam. Considering transient and rheological parameters synthetically, a more reasonable response surface function is proposed, and a method of transient rheological material parameter inversion based on response surface method is proposed, which greatly improves the efficiency and precision of inversion. Taking Shuibuya Concrete Faced Rockfill Dam as an example, the transient and rheological parameters of the dam body are inversely analyzed by this method. The inversion results show that the calculated values agree well with the measured values and the inversion results are reasonable and reliable and more efficient.