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Stability reliability analysis of multi-stage slope under earthquake action
Published in Mohd Johari Mohd Yusof, Junwen Zhang, Advances in Civil Engineering: Structural Seismic Resistance, Monitoring and Detection, 2023
Zhao Long, Yi-lei Shi, Wei-li Li, Cheng-ming Cao
There are many uncertain factors affecting slope stability, such as strength parameters of rock and soil mass, earthquake action, rainfall action, reinforcement structure of frame anchor, and so on. It has been shown that the uncertainty and variability of internal friction angle and cohesion of rock of soil strength parameters have an obvious influence on the stability of slope (Chen 2018; Jiang 2015; Guo 2018; Zhang 2017; Zhu 2019). The acceleration of seismic action fluctuates with seismic action time, and the random uncertainty is obvious, which has a serious adverse effect on slope stability (Dong 2015, 2017). Therefore, during reliability analysis of slope stability, it is necessary to consider the influence of soil strength parameters and the uncertainty of seismic action on slope stability.
Land-use and climate-change impacts on landslide hazards in SE Britain
Published in David M. Cruden, Robin Fell, Landslide Risk Assessment, 2018
A small-scale landslide is a big event to the inhabitants of one or more affected properties. Slopes in southern Britain have often been left with a sensitive mantle of readily-disturbed landslide debris. Seemingly insignificant activities can destroy the reserves of stability which do exist. Anthropogenic activities are often intrinsically damaging to slope stability. The consequences of failing to appreciate that a slope has some of its present reserve of safety by virtue of a past land-use or land-use related system, as in the case of the disruption of shallow land drainage, can have additional impacts.
Erosion Sediment Control
Published in M. Sengupta, Environmental Impacts of Mining, 2018
Soil slopes include natural soil slopes and all denuded cut and fill. Manmade cut and fill slopes are usually constructed at a grade of 0 to 50%. Under some exceptionally good soil and hydrological conditions the grade can be steepened to 67%. A slope of 33% is considered to be the maximum for the safe operation of excavation equipment. Factors usually considered in designing a slope include slope stability, soil erodibility, and the ability of the soil to support vegetation.
Determination of critical phreatic level for landslide assessment using a scaled down laboratory model
Published in International Journal of Geotechnical Engineering, 2022
R. Ramkrishnan, Animesh Sharma, Karthik Viswanathan, D. Ravichandran
The term landslide refers to a form of slope stability failure characterized by massive ground movements of the earth, rocks, or debris under the effect of external factors like extreme precipitation and earthquakes, eventually resulting in various modes of mass movements such as rock-falls, slope failures, mud-flows or debris flows. Occurrences of landslides can be characterized as disastrous events as they often result in the loss of a multitude of resources and even human lives. The city of Coimbatore, Tamil Nadu is located on the banks of river Noyyal and is surrounded by Western Ghats (Sahayadri mountain range), which are frequently prone to landslides and slope failures, often during monsoons and thereby attributing the effect to changes in hydrological factors. Several other human factors can also be attributed to slope stability issues such as topographical variations induced due to human activities such as quarrying, mining, construction, etc. (Sajinkumar et al. 2014).
An experimental and numerical investigation of reinforced slope using geotextile encased stone column
Published in International Journal of Geotechnical Engineering, 2021
Masoud Nasiri, Mohammad Hajiazizi
Over the years, stabilisation of soil slopes was one of the important subjects of scientific researches and attracted lots of attention. Stabilisation methods include specific techniques that should be well known and can be modelled practically (Abramson et al. 2002). Slope stability can increase by various methods such as changing geometry of the slope surface, using soil reinforcement or installing reinforcing structures such as stone columns. Some of the reasons that make stone columns suitable for stabilising soil slopes are as follows: Increasing load carrying capacity, reducing settlement, increasing shear strength (in silty and clay soils), controlling liquefaction, and drainage (due to high permeability). Stone columns act as resistant members, which are normally expose to lateral forces. Geotextile encasing increases confining pressure in addition to resistance to horizontal displacement.
Landslides susceptibility mapping using GIS and weights of evidence model in Tetouan-Ras-Mazari area (Northern Morocco)
Published in Geomatics, Natural Hazards and Risk, 2018
Meryem Elmoulat, Lahcen Ait Brahim
Drainage is another major cause of landslides by undercutting and eroding slopes. Fluctuation of sub-surface water changes the pores’ water pressure in the soil and then changes the slope stability. As it was mentioned (WP/WLI 1994; Kouli et al. 2014), fluvial erosion is one of the most common triggering causal factors of landslides. The hydrographic network factor was automatically derived from DEM using ArcHydro tool. This extension was developed by ESRI along with a hands-on document that explained step-by-step how to perform drainage analysis on a terrain model. DEM Raster analysis is performed to generate data on flow direction, flow accumulation and watershed delineation. These data are then used to develop a vector representation of catchments and drainage lines. Using this information, a geometric network is constructed (ESRI 2011). The final map of distance to drainage was validated using the topographic map of Tetouan scale 1:50,000. After that, the map was classified into five classes by using the quantile classification method, Figure 4(c).