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采用双剪统一强度理论,导出了朗肯主动土压力计算的双剪统一解。算例分析结果表明:随着中主应力系数b值的增大,朗肯主动土压力减小,土压力作用点距墙顶的竖直距离减小。所给出的解可以灵活运用于各种不同特性材料朗肯主动土压力的计算,应用双剪统一强度参数公式可以求算不同b值所对应的土体的强度参数。该值同时包含了主应力σ1、σ2和σ3对材料强度的贡献,并可将常规土工试验方法所测得的强度指标c0、φ0换算为双剪强度指标ct,φt。统一解可以更好地发挥挡土墙填料的强度潜力。
Using double shear unified strength theory, the double shear unified solution of Rankine’s active earth pressure calculation is derived. The numerical results show that with the increase of b, the Rankine active earth pressure decreases and the vertical distance of earth pressure acting point from the top of the wall decreases. The given solution can be flexibly applied to the calculation of Rankine’s active earth pressure for all kinds of material with different properties. The uniform strength parameter formula of double shear can calculate the strength parameters of soil with different b values. The value also includes the contribution of the principal stresses σ1, σ2 and σ3 to the material strength. The strength indices c0 and φ0 measured by the conventional geotechnical test methods can be converted into double shear strength indexes ct and φt. The unified solution can better exert the strength potential of retaining wall packing.