Horizontal Drains as Effective Measure for Landslide Remediation

Kopecký, M.; Ondrášik, Martin; Antolova, D.

doi:10.2478/sgem-2013-0011

Cited by 8 publications

(4 citation statements)

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“…This is in line with the discoveries of (Kenney and K.C. Lau, 1982), (Kopeckr, Ondrasi and Antolova, 2013), (Ahmed et al, 2012b), (Lin et al, 2016), (Pfeiffer, 2014) and (Amatya and Mori, 2018).…”

Section: Introductionsupporting

confidence: 84%

Effectiveness of Horizontal Sub-drain to Increase Slope Stability with Vertical Cracks and Weathering Soil in Areas with High Rainfall Intensity

Sari

Mochtar

Chaiyaput

2022

Preprint

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A landslide occurred a few meters from the foot of the power plant tower in a hilly area in the Tulakan District, Pacitan, East Java Province, Indonesia. This incidence occurred after the area was flooded with a cumulative intensity of more than 1000 mm in one month and a maximum daily rainfall above 300 mm. Previous reports considered horizontal sub-drain cost-effective to reduce the groundwater level and the impact of rainwater seepage into the soil on slope stability. Therefore, this study aims to determine the effectiveness of horizontal sub-drain as an alternative for managing groundwater and rainwater that seeps into the soil to increase the slope factor of safety. The effect of real-time rainfall for 30 days before the landslide, hydraulic conductivity, changes in soil parameters due to cracking and weathering, and the existing groundwater level are also considered. The analyses were carried out using the coupled program SEEP/W for transient seepage and SLOPE/W with finite element method and limit equilibrium. The result showed that horizontal sub-drain increases the slope factor of safety from critical limit to more than 1.1 in 30 days of rainfall in high ground water level condition. The hydraulic conductivity parameters of the soil, the location of the horizontal sub-drain, as well as the cracked and weathered conditions in the soil also affect the effectiveness. In low-level ground water conditions, the duration of the rain and the intensity of the rain also greatly affect the effectiveness of the horizontal sub-drain as well as the number of cracks. In this condition, the safety factor on the slope with the horizontal sub-drain can increase the safety factor from less than one to more than one thus the slope becomes more stable. The results of this study also show that the effectiveness of the horizontal sub-drain is very sensitive to many things, therefore in its planning it is necessary to review many aspects more carefully.

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Section: Introductionsupporting

confidence: 84%

Effectiveness of Horizontal Sub-drain to Increase Slope Stability with Vertical Cracks and Weathering Soil in Areas with High Rainfall Intensity

Sari

Mochtar

Chaiyaput

2022

Preprint

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“…Among the most common methods of mitigation techniques, the subsurface drainage of landslide slopes is the most suitable by using horizontal drainage borehole (HDB). The advantage of this method lies in its quick effectiveness and relatively low cost (Kopecký et al 2013). HDB effi ciency is the best if the horizons are captured, especially in the upper parts of the slope where the effect of the water hydrostatic pressure reduction contributes most to the slope stability.…”

Section: Evaluation Of Mitigation Techniquesmentioning

confidence: 99%

“…HDB effi ciency is the best if the horizons are captured, especially in the upper parts of the slope where the effect of the water hydrostatic pressure reduction contributes most to the slope stability. They are effective also for drainage of groundwater gathered on a dilatational slip surface of landslides (Kopecký et al 2013). On the other hand, it is not suitable to use HDB in thick layers of fi ne-grained (pelitic) rocks with low permeability.…”

Section: Evaluation Of Mitigation Techniquesmentioning

confidence: 99%

“…Lots of horizontal boreholes is necessary to install in such case, because the areal coverage of one HDB in such material is very small. Great care must be taken when using HDB for remediation of deep landslides not only in pelitic, but also in strongly weathered and broken semi-hard rocks (Kopecký et al 2013). The simulation of pore water pressure distribution at the slip surface during low and high rainfall periods helps to identify the critical locations with higher pore water pressure even during low rainfall periods (Shrestha et al 2014).…”

Section: Evaluation Of Mitigation Techniquesmentioning

confidence: 99%

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Occurrence of landslides in Nepal and their mitigation options

Thapa

2015

Journal of Nepal Geological Society

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Landslides are very common occurrences in Nepal that have been affected development infrastructures, lives, and properties of the people every year. Many hill villages are situated on or adjacent to unstable slopes and old landslides are reactivated from time to time. The rapidly increasing construction of infrastructure, such as roads, irrigation canals, and dams without due consideration of natural hazards is contributing to triggering of landslides and debris fl ows. Thus, this paper has explored the cause and characteristics of landslides occurrences and their mitigation practices in Nepal. Topographic, geologic and triggering factors, and human intervention causing landslides are characterised to suggest the suitable mitigation options that can be implemented in the mountain hill-slopes. Among the wide range of slope stabilisation measures which are available to practitioner engineer, the lowering of groundwater level in combination of controlling of surface infi ltration (e.g. sealing of tension cracks) of water into landslide are the most cost effective options for mountainous terrain because the rise in pore water pressure is one of the basic cause of landslides during the rainy season. In addition, removing of unstable slope debris, surface drainage, and retaining walls are the useful landslide mitigation measures depending on site conditions, availability of budget, and specifi c requirements. Various support systems and elements can be crafted for creative solutions of the slope instability problems in Nepal.

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The Performance of Horizontal Drain as a Landslide Mitigation Strategy

Sari

2022

Lecture Notes in Civil Engineering

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Horizontal Drains as Effective Measure for Landslide Remediation

Cited by 8 publications

References 1 publication

Effectiveness of Horizontal Sub-drain to Increase Slope Stability with Vertical Cracks and Weathering Soil in Areas with High Rainfall Intensity

Effectiveness of Horizontal Sub-drain to Increase Slope Stability with Vertical Cracks and Weathering Soil in Areas with High Rainfall Intensity

Occurrence of landslides in Nepal and their mitigation options

The Performance of Horizontal Drain as a Landslide Mitigation Strategy

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