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根据水中填土坝运用期坝体密度变化具有泡胀性的特点,以及对库水位降落期孔隙压力实测资料的分析,笔者认为水中填土坝在库水位降落期的孔隙压力计算应采用考虑骨架变形的比奥(Biot)固结理论模型。本文根据原型观测资料,对影响计算成果的三个主要力学指标:抗滑系数K,固结系数c_v和有效当量剪阻角(?)＇_s,推荐了经验公式。并提出了简化有效应力法——二维压密近似解。
According to the characteristics of the water-filled earthfill dam during the operation period, the density of the dam body is swellable, and the analysis of the measured pore pressure of the reservoir water level during the fall period, the author believes that the calculation of the pore pressure at the landing stage of the water filling dam in the water should be considered using the skeleton. Deformed Biot consolidation model. Based on the prototype observation data, this paper recommends the empirical formulas for the three main mechanical parameters affecting the calculation results: anti-sliding coefficient K, consolidation coefficient c_v and effective equivalent shear angle (?)’_s. And put forward the simplified effective stress method - two-dimensional compaction approximate solution.