Bearing Capacity of Shallow Footings Reinforced with Braid and Geogrid Adjacent to Soil Slope
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(2020) 6:41
ORIGINAL PAPER
Bearing Capacity of Shallow Footings Reinforced with Braid and Geogrid Adjacent to Soil Slope Sajjad Satvati1 · Hossein Alimohammadi2 · Mohammadali Rowshanzamir3 · Seyed Mahdi Hejazi3 Received: 18 June 2020 / Accepted: 22 August 2020 © Springer Nature Switzerland AG 2020
Abstract One of the common features used for improving the bearing capacity of footings adjacent to a soil slope is reinforcement by geosynthetics. These elements may somehow isolate the soil inside of the geosynthetic and eliminate shear-stress mobilization. In this study, a new kind of three-dimensional geosynthetics called expandable braided sleeve (braid) and geogrid have used a laboratory modeling approach to investigate the effects of different variables on the bearing capacity of footings on soil slopes. Some parameters, including relative density and soil compaction, were assumed constant in all tests. In contrast, other variable parameters, including the vertical distance between the surface and the first layer of geosynthetics, the distance of a footing from the slope edge, and planar and tabular shapes of braid and geogrid were investigated. Results demonstrated that for the same conditions of some parameters, cylindrical reinforcement has a more significant effect than the planar form of the reinforcement concerning enhancing bearing capacity and settlement reduction. Inclusion of geosynthetic reinforcement can also reduce stress concentration and distribute the applied load, resulting in settlement reduction. Moreover, braid material was found to result in somehow better performance than geogrids in reducing settlement. Keywords Geosynthetics · Reinforced slope · Bearing capacity · Shallow footing
Introduction Bearing capacity and settlement are primary factors in the design of several types of geotechnical structures such as bridge foundations, building foundations close slopes, and roads in mountainous areas. Design of foundations adjacent to soil slopes depends significantly on a variety of factors such as foundation properties (shape, width, and depth), soil mechanical properties (friction angle, shear properties, and density), and distance of a foundation from the soil slope [1–7]. Since there are many situations where the bearing capacity of the footings adjacent to the sloping surfaces, are significantly reduced from that of footings located on horizontal ground, solutions such as improving the geometry
* Sajjad Satvati [email protected] 1
Terracon Consultants, Inc., Omaha, NE 68144, USA
2
Civil, Construction and Environmental Engineering, Iowa State University, Ames 50011, USA
3
Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
of sloping surfaces, injections, or use of soil reinforcers are required to improve the bearing capacity of foundations under such conditions. One suitable method for improving the bearing capacity of footings is to reinforce the slope with geosynthetic layers [8, 9] that can be used on a steep slope in various app
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