Abstract
Problem statement: Soft engineering solution of sloppy surface utilizes mechanical and hydrological effects of vegetation. The hydrological effects driven by transpiration, induces an increase in matric suction and consequently tension also increase along with the decrease of moisture. Therefore once the horizontal stress of the soil exceeds the limit of tensile strain of the soil cracks occurs. Approach: The negative pore-water pressures estimated through an unsaturated water-uptake analysis. The results of the root water-uptake analysis are then used as an input for the prediction of displacements in a stress-deformation analysis in an uncoupled formulation. The formulation of the governing partial differential equations for both water-uptake and stress-deformation is based on the general theory of unsaturated soils. The ground displacement presented here only considers hydrological effects which are related to soil moisture variations driven by transpiration. Results: The ground displacement profiles as a result of matric suction changes at key times and at key locations have been presented. The matric suction changes induced settlements are estimated. The magnitude of the ground displacement depends on the relative position of the tree on the slope. The ground displacement depends, to some extent, on the precise position of the tree. Conclusion: These showed that excessive increase matric suction and tension due to decrease of moisture can lead settlement. Moisture reduction reaching a critical state causes cracks to be established, of course has negative consequences on sloppy ground.
Highlights
Will lead to increase in penetrability and even trigger sliding during heavy rains
Cracks may occur due to settlement once the application of the water-uptake model, with uncoupled stress-deformation analysis were used to provide a preliminary assessment of ground settlement due to ground water abstraction, resulting from suction changes on the stability of unsaturated soil slopes
Most researchers considered the mechanical and hydrological effects of vegetation in the beneficial context, neglecting that in unsaturated soils, matric suction and tension increase along with the decrease of moisture, tensile strength clearly depends on suction
Summary
Will lead to increase in penetrability and even trigger sliding during heavy rains. This presence of cracks. Most researchers considered the mechanical and hydrological effects of vegetation in the beneficial context, neglecting that in unsaturated soils, matric suction and tension increase along with the decrease of moisture, tensile strength clearly depends on suction. The depth and formation of more cracks is directly proportional to further moisture depletion If this occurs on a sloppy surface, it horizontal stress caused by desiccation of the soil exceeds the limit of tensile strain of the soil. Net horizontal stresses in unsaturated soils decrease with increasing metric suctions (Fredlund and Rihardjo, 1993). He added that horizontal stresses can become zero or negative due to increasing matric suctions. The depth of cracks is constrained by the increasing stresses due to soil self-weight and their surfacial length is limited by intersection with other cracks
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