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Numerical simulation of hydro-mechanical constraints on the geometry of a critically tapered accretionary wedge

机译：对致锥形增压楔几何的水力机械约束的数值模拟

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A critically tapered active accretionary wedge was simulated using a numerical analysis of plastic slip-line theory to understand the mechanics of morphologic evolution. The concept of critical state soil mechanics was applied to describe the entire wedge area overlying a basal decollement fault. Presuming a condition of two-dimensional plane strain along the compressional direction, we obtained the numerical solution of conjugate plastic slip lines at a critical state of stress defined by the Coulomb yield criterion. The velocity vectors were obtained by applying the associate flow rule with the boundary conditions at the upper surface of the wedge. Finally, the detachment was determined from the effective stress condition inside the wedge and the sliding friction coefficient along the fault. Our numerical simulations demonstrate that the morphology of a critically tapered wedge is dependent on the frictional strengths of both the wedge materials and the basal fault. The critical taper angle decreases with increasing internal friction angle and decreasing basal friction coefficient. The results also revealed that the pore pressure controls the morphology of the accretionary wedge for cohesive sediments but not for non-cohesive materials. The effect of pore pressure on the morphology of a critically tapered accretionary wedge becomes more significant as the cohesion increases. Assuming that the cohesion is very low, we could infer the ranges of strengths that most observed wedge geometry data have 0.3-0.6 for the basal friction coefficient and ~35-45 degrees for the internal friction angle of the wedge materials.
机译：利用塑料滑线理论的数值分析模拟了一个关键锥形的活性增生楔，了解形态学进化的力学。应用临界状态土机械的概念，描述了整个楔形区域覆盖基底解耦故障。沿着压缩方向推测二维平面应变的条件，我们在由库仑产率标准定义的临界应力状态下获得共轭塑料滑动线的数值溶液。通过在楔形表面的边界条件下施加助轴来获得速度向量。最后，从楔内的有效应力条件和沿着故障的滑动摩擦系数确定脱离。我们的数值模拟表明，尺锥形楔形的形态取决于楔形材料和基础故障的摩擦强度。随着内部摩擦角度的增加和基础摩擦系数降低，临界锥角减小。结果还透露，孔隙压力控制粘性沉积物的增生楔的形态，但不适用于非粘合材料。随着凝聚力的增加，孔隙压力对关键锥形增生楔形的形态的影响变得更加重要。假设凝聚力非常低，我们可以推断大多数观察到的楔形几何数据的强度范围为基底摩擦系数为0.3-0.6，对于楔形材料的内部摩擦角度，〜35-45度。

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