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Abstract
Soft soil has low shear strength and its density is high; construction of embankments on them would cause problems such as large and non-uniform subsidence. One way to avoid these subsidence is using of geo-grid combined with cement and lime columns. Geo-grids due to their tensile strength, and cement and lime columns due to their bearing capacity and their body friction, reduce embankment subsidence. Extensive researches have been done in order to reduce the subsidence of the embankments located on the roads, but few studies have being done about the inclined embankments on soft soil layers. In this paper, the road embankment has been located on inclined soft soil layers; the study will try to reduce embankment subsidence and uniform them using geo-grid combined with cement and lime column subsidence. The results show that the realization of this issue will cause subsidence reduction and uniformity in the embankment surface.
Highlights
Soil reinforcement is one of the reliable and effective ways in improving soil’s properties
It is assumed that the columns have been built in a day and geo-grid has run on the same day; embankment has done in five stages and 2 days has been considered for each stage in order to stabilize the soil
One way to improve soil in this article is reinforcing the soil beneath the embankment by a geo-grid combination with cement and limestone columns
Summary
Soil reinforcement is one of the reliable and effective ways in improving soil’s properties. Geo-grids are rigid or flexible polymer sheets that are perforated with numerous applications in civil engineering. Some of their uses can be reducing the embankment’s subsidence located on soft soils. Long columns strength and rigidity is more than short ones, so long columns are being used in extensive subsidence and shorter columns are being used in restrictive subsidence These columns will uniform embankments subsidence and would bear different loads caused by embankments and transportation vehicles, due to their bearing capacity and their body friction; would unify soil amount and would increase its bearing capacity. Esna-ashari (2010) did his studies in the field of combined embankments with cement and limestone columns in the soft soil inclined layers [10]. Several three-dimensional finite analyses have been carried out on gray limestone columns with different lengths and diameters by Zheng (2003 and 2008) [11] [12]
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