植物根系土的剪切强度简化计算方法

选取典型植物根系结构,建立根系相对面积随深度的变化函数,分析植物根系拉伸强度与根系直径、植物高度与地表根系主干面积、地表根系主干面积与竖直方向延伸深度的统计关系。根据加筋原理,解释了植物根系土的强度增强机理,建立了根系土剪切强度随深度减小的统一函数,该函数可由植物根系拉伸强度和根系面积沿深度分布直接计算根系土的剪切强度,简化了根系土剪切强度的确定方法,最后通过已有数据对该函数的可行性进行了验证。

Simplified calculation method of shear strength for root-permeated soils

Four typical plants are chosen to analyze the reinforcing mechanism of plant root and form a simplified calculation method of shear strength for root-permeated soils. A uniform function for the area-depth distribution of plant was proposed based on these four typical plants. The relationship of tensile strength and root diameter, correlation of plant height to sectional area of root trunk at ground surface, and that of sectional area of root trunk at ground surface to maximum vertical depth from the surface were statistically analyzed. Then, reinforcing mechanism of root-permeated soil was explained based on the reinforcement principle. A simple method to calculate the shear strength of root-permeated soil was proposed according to a uniform function for the correlation of reduced shear strength to depth. The shear strength of root-permeated soil can be directly calculated from the tensile strength of roots and the distribution of root area to depth. At last, the feasibility of proposed method was validated by existing data.