Which of these is an engineering solution to mitigating mass wasting risk?

Question

BlackTom AI · Accepted Answer

Question restatement: The prompt asks which option constitutes an engineering solution to mitigating mass wasting risk.
Given option: 'remove water from a slope by draining it from below ground.'
Analysis of the provided option:
- Principle: Lowering pore water pressure within a slope reduces the driving shear stress that contributes to soil shear strength loss, thereby increasing slope stability. Draining water from below ground directly addresses groundwater pressures and can decrease seepage forces that drive mass wasting.
- Practical effectiveness: Subsurface drainage (e.g., horizontal drains, collector trenches, or tile drains) is a well-established engineering measure used in slope stabilization projects. It helps to reduce rainfall infiltration effects, suctioning water out of the slope mass, and can be designed to intercept perched or perched groundwater to lower water levels.
- Engineering considerations: Implementing such drainage requires assessment of hydrogeology, drainage design capacity, potential for groundwater rebound, and proper drainage outlet management to avoid unintended erosion or piping around the drain. It should be integrated with other stabilization measures if necessary (retaining structures, revegetation, etc.).
- Alternative potential options (not provided): Other engineering approaches could include rock bolts, retaining walls, surface drainage, soil nailing, revegetation, or slope regrading. Since none are listed, we cannot evaluate them here.
- Why this option is sound: Mitigating mass wasting often hinges on reducing pore pressures and seepage forces within the slope, and below-ground drainage directly targets that mechanism, making it a valid engineering solution.
- Potential caveats: If drainage is not properly designed or if drainage paths become clogged, effectiveness can diminish. Careful design and maintenance are necessary to ensure long-term stability.
Overall assessment: The provided option aligns with standard engineering practice for slope stabilization by lowering groundwater pressures, making it a correct and plausible solution within the scope of mass wasting mitigation.

Note: The dataset provided lacks additional answer options to compare against; in a typical multiple-choice setting, one would contrast this option with alternatives to identify the most appropriate solution. Here, the single option is evaluated on its own merits as an engineering approach to reduce mass wasting risk.

ESCI 1012 (001) Quiz 7 Landslides and down slope movement

Which of these is an engineering solution to mitigating mass wasting risk?

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