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三、改进的雪橇模型及其应用雪橇模型中没有确定tanφ_a的方法,因此我们提出了测定滑体运动期间内摩擦角和图6中情况B的孔隙水压力的方法。Sassa把采用土力学试验确定视摩擦角的雪橇模型称之为改进的雪橇模型,由于该模型采用了土工试验手段,所以也可称之为土工雪橇模型。在此,我们利用公式(2)和公式(5)推导出计算视摩擦角的公式。在图10中,荷载作用下滑面上的剪切应力为:△τ=τ_f-τ_0=(σ_0+△σ-△u)tanφ_m-τ_0 (9) τ_f:破坏后的剪切应力;σ_0,τ_0:施加荷载前的初始应力(粘聚力可忽略不计)。在这种情况下,φ_m将包含滑体顶部附近非常有限部分的机(峰值)。
3. Improved sled model and its application There is no method to determine tanφ_a in the sled model. Therefore, we propose a method to determine the internal friction angle during the motion of the slide body and the pore water pressure in case B in Fig. 6 . Sassa called the sled model using the soil mechanics test to determine the apparent friction angle as an improved sled model. Because the model uses a geotechnical test method, it can also be called a geosleigh sled model. Here, we use equations (2) and (5) to derive the formula for calculating the apparent friction angle. In Fig. 10, the shear stress on the sliding surface of load is: Δτ = τ_f - τ_0 = (σ_0 + Δσ - △u) tanφ_m - τ_0 (9) τ_f: shear stress after failure; σ_0, τ_0: Initial stress before loading (negligible cohesion). In this case, φ_m will contain a very limited portion of the machine near the top of the slider (peak).