Lishan Landslide Remediation (Drainage Well) Design

Location : Lishan Village, Heping District, Taichung City

Site Characteristics The project area lies within a historical large-scale landslide zone, where previous massive ground movements resulted in fractured geological formations and significant fluctuations in groundwater levels, posing long-term stability concerns.

Project Scale Design and construction supervision of drainage shafts and subsurface drainage galleries, along with the integration of existing monitoring data to establish an engineering information management system for the landslide area.

Geotechnical Features Groundwater control as the core remediation strategy: Groundwater uplift pressure has been a key factor triggering landslide movements in Lishan. The system of deep drainage shafts combined with subsurface drainage galleries effectively lowers pore-water pressure and improves slope stability. Part of a long-term remediation program: This work forms a component of the six-year landslide remediation plan initiated by the Soil and Water Conservation Bureau in 1995. Monitoring data integration: Existing monitoring records—such as groundwater levels, surface displacement, and deep-seated movement data—were consolidated to build an engineering information management system, enabling long-term tracking and adaptive planning. Complex subsurface conditions: The fractured strata and variable depths of the slip surfaces required careful evaluation of shaft placement and drainage efficiency, presenting significant geotechnical challenges.