Abstract
The slope instability may result due to change in stress conditions, rise in groundwater and rainfall. Similarly, many slopes that have been stable for many years may suddenly fail due to loss of soil shear strength, and external forces. This is a crucial problem as it may destroy buildings, damage roads, and even leads to loss of human life. So it is imperative to understand failure mechanism and adopt safety measures to prevent such failures. The objective of this study is to analyze the slope at different angles (at 300, 350, 450 & 600 ) in silty soil and propose a method to stabilize it. The proposed methods to stabilize the existing slope are replacing soil-cement (7% by weight) by vertical layering and layering along the slope. Limit equilibrium method was used to analyze the slopes. The existing slopes were likely to be failed because values of minimum FOS was computed less than 1.5. The FOS improved significantly after replacing soil cement by both methods. Among the two methods, it was revealed that the layering along slope method of soil replacement was most economical and easy to be executed at the site.
Highlights
Slope instability problems in natural and manmade slopes are most common challenges for civil engineers
Limit equilibrium analyses were performed using SLOPE/W to evaluate the stability of slopes
The limit equilibrium analyses were performed on three different cases of slopes stabilization, for each case, the stability of slope was determined at four different slope angles (i.e. 30o, 35o, 45o, 60o)
Summary
Slope instability problems in natural and manmade slopes are most common challenges for civil engineers. The slope instability may result due to change in stress conditions, rise in groundwater table and rainfall. Many slopes that have been stable for many years may suddenly fail due to changes in the slope geometry, loss of soil shear strength, and external forces effect [1]. The long-term slope stability is affiliated with the chemical influence and weathering action that can lessen the soil shear strength and produce tension cracks. In these conditions, the slope stability evaluation turns a basic interest all over
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