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当坝基存在软弱夹层时,土坝的稳定分析通常采用“改良圆弧法”。改良圆弧法在确定抗滑力 P_n 时采用的力多边形与计算滑动力 P_a 所用的力多边形完全相同,这样做可使计算简化,并使计算偏于安全。但当凝聚力 C,摆角α或内摩擦角φ较大时,则会使计算产生极大的误差。一、实用改良圆弧法“实用改良圆弧法”与“改良圆弧法”的不同之处在于:(1)计算抗滑土体的抗
When there are weak interbeds in the dam foundation, the stability analysis of earth dams usually adopts “improved arc method”. The force polygons used in the improved circular arc method to determine the anti-skid force P_n are exactly the same as the force polygons used to calculate the sliding force P_a, which simplifies the calculation and makes the calculation safer. However, when the cohesion C, swing angle α or internal friction angle φ is large, it will make a huge error in the calculation. First, the practical improvement of arc method “practical improvement arc method” and “improved arc method” the difference is that: (1) calculate the anti-skid soil resistance