Publisher

LMULMU

Journal Buletin Profesi InsinyurBuletin Profesi Insinyur Abstract

This study investigates the stability of natural slopes along the Martapura River, particularly in areas adjacent to roadways, with a focus on assessing the impact of river water level fluctuations on slope safety factors. The analysis was performed using SLOPE/W, a GeoStudio module, based on the widely adopted limit equilibrium method. Several hydrological scenarios, including dry, normal, rapid rise, and rapid drawdown conditions, were simulated to evaluate their influence on slope behavior. The results demonstrate that both river and groundwater level variations significantly affect slope stability. Rising groundwater levels increase pore water pressure, reduce effective stress, and lower the factor of safety (FS) from 1.118 under dry conditions to 1.102 in the normal-water scenario (−1.4%). In contrast, a sudden increase in river level induces a temporary stabilizing effect, elevating the FS to 1.473 ( 33.7% relative to normal), before stabilizing at 1.323. The most critical condition arises during rapid drawdown, where a sudden drop in river level while groundwater remains high leads to elevated pore pressure, loss of hydrostatic support, and a significant FS reduction to 0.929 (−30%), posing a risk of slope failure. Moreover, the hydrologic hysteresis between river and groundwater responses, mainly governed by soil permeability, emerges as a key factor influencing slope stability dynamics. These findings highlight the importance of integrating hydrological variability into slope monitoring and risk mitigation strategies.

Conclusion

The study concludes that fluctuations in river water level and groundwater significantly impact slope stability along the Martapura Riverbank.A rapid drawdown phase, where river water levels decrease while groundwater remains high, poses the most critical risk of slope failure due to increased pore pressure and loss of hydrostatic support.Hydrologic hysteresis, influenced by soil permeability, plays a key role in these dynamics, emphasizing the need for comprehensive monitoring and mitigation strategies.

Future Research

Penelitian lanjutan perlu dilakukan untuk memahami lebih dalam pengaruh variasi lapisan tanah terhadap respons hidrologis lereng, terutama dalam kondisi fluktuasi muka air sungai yang cepat. Studi eksperimen di laboratorium dan pemodelan numerik yang lebih kompleks dapat digunakan untuk mensimulasikan interaksi antara air tanah dan air sungai dalam berbagai konfigurasi lapisan tanah, sehingga dapat memprediksi potensi kegagalan lereng dengan lebih akurat. Selain itu, pengembangan sistem peringatan dini berbasis pemantauan real-time terhadap perubahan muka air sungai dan tekanan air pori di dalam lereng sangat penting untuk mengurangi risiko bencana tanah longsor. Sistem ini harus mampu mengintegrasikan data dari berbagai sumber, seperti sensor muka air, piezometer, dan data curah hujan, serta memberikan peringatan dini kepada masyarakat dan pihak berwenang ketika kondisi lereng mencapai ambang batas kritis. Terakhir, penelitian perlu difokuskan pada pengembangan teknik perbaikan lereng yang efektif dan berkelanjutan, dengan mempertimbangkan karakteristik geoteknik dan hidrologi spesifik di wilayah aliran sungai Martapura.

Metadata

File size	619.42 KB
Pages	8
DMCA	Report