Volume 8, Issue 2 (Autumn & Winter 2023)
KJES 2023, 8(2): 117-142 |
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Hashemi S, Bolouri Bazaz J. Experimental and numerical investigation on the effect of overburden and soil compaction on nail pullout strength in earth reinforced with nailing. KJES 2023; 8 (2) :117-142
URL: http://gnf.khu.ac.ir/article-1-2824-en.html
URL: http://gnf.khu.ac.ir/article-1-2824-en.html
1- Ferdowsi University of Mashhad
2- Ferdowsi University of Mashhad , bolouri@um.ac.ir
2- Ferdowsi University of Mashhad , bolouri@um.ac.ir
Abstract: (207 Views)
One of the most important issues in urban areas is the stabilization of vertical and sloping earth walls. Nailing technique used for slope stabilization, has become popular day by day in urban environments, around the world. Normal drilling wells, even at shallow depths, have collapsed many times when subjected to applied loads, resulting in reduced work progress, loss of life and unpredictable economic costs. On the other hand, the collapse of drilling holes causes to loosen the soil structure and reduce its density, which in turn causes more horizontal and vertical deformations to occur in the earth’s surface. This research, introduces the deep excavation stabilization with the aid of laboratory and numerical modeling and presents the effect of overburden and soil density on the nails behavior. It was observed that under the conditions of the same soil density, the pullout capacity of all types of nails increases with the increase of the overburden pressure applied on the soil. For example, by increasing the overburden from 0.2 to 0.5 kg/cm2, in a soil sample with a specific weight of 1.4 gram/cm3, it causes a 100% increase, and in a soil sample with a specific weight of 1.6 gram/cm3 causes a 150% increase in the nail pullout capacity. Also, under the same conditions of the applied overburden pressure, the pullout capacity of the nails will increase due to the increase in the specific dry weight of the soil, which is an increase in the density of the soil. In other words, by increasing the specific dry weight of the soil from 1.4 to 1.6 gram/cm3, by applying overburden of 0.2, 0.5, and 0.8 kg/cm2, the pullout capacity of the nail increases by 16, 35, and 40 percent compared to the initial state.
Keywords: Soil Nailing, Overburden, Soil Density, Nail Pullout Strengh, Experimental and Numerical Modeling
Type of Study: Original Research |
Subject:
Engineering Geology
Received: 2022/11/14 | Accepted: 2023/02/17 | Published: 2023/03/17
Received: 2022/11/14 | Accepted: 2023/02/17 | Published: 2023/03/17
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