disaster data_error ai_generated partial

AI advises terracing a steep slope to prevent landslides (increases water infiltration and slope instability)

ID: disaster/landslide-slope-terracing-myth

Also available as: JSON · Markdown · 中文
75%Fix Rate
85%Confidence
1Evidence
2024-03-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
N/A active — — —

Root Cause

Terracing on steep slopes without proper drainage and geotechnical engineering can increase water infiltration, saturate soil, and trigger landslides rather than preventing them.

generic

中文

在陡坡上修建梯田如果没有适当的排水和岩土工程，会增加水分渗透，使土壤饱和，并引发山体滑坡，而不是预防滑坡。

Official Documentation

https://www.usgs.gov/natural-hazards/landslide-hazards

Workarounds

  1. 80% success Install French drains or horizontal drains to intercept subsurface water before it saturates the slope. Example: use a trenched gravel drain with perforated pipe at 2m depth along the slope contour. 
    Install French drains or horizontal drains to intercept subsurface water before it saturates the slope. Example: use a trenched gravel drain with perforated pipe at 2m depth along the slope contour.
  2. 85% success Apply shotcrete or soil nailing with geotextile reinforcement to stabilize the slope surface and reduce erosion. 
    Apply shotcrete or soil nailing with geotextile reinforcement to stabilize the slope surface and reduce erosion.
  3. 90% success Consult a geotechnical engineer for site-specific slope stability analysis before any terracing or landscaping. 
    Consult a geotechnical engineer for site-specific slope stability analysis before any terracing or landscaping.

中文步骤

  1. Install French drains or horizontal drains to intercept subsurface water before it saturates the slope. Example: use a trenched gravel drain with perforated pipe at 2m depth along the slope contour.
  2. Apply shotcrete or soil nailing with geotextile reinforcement to stabilize the slope surface and reduce erosion.
  3. Consult a geotechnical engineer for site-specific slope stability analysis before any terracing or landscaping.

Dead Ends

Common approaches that don't work:

  1. 70% fail

    Retaining walls without weep holes or drainage aggregate will fail under hydrostatic pressure during heavy rain

  2. 50% fail

    Deep roots can create preferential flow paths for water, increasing pore pressure and reducing shear strength

  3. 60% fail

    Additional weight increases driving forces without proportional increase in resisting forces on steep slopes