Seismic Bearing Capacity of Strip Foundations on Fiber-Reinforced Granular Soil
- PDF / 5,087,723 Bytes
- 15 Pages / 547.087 x 737.008 pts Page_size
- 71 Downloads / 211 Views
(0123456789().,-volV) ( 01234567 89().,-volV)
ORIGINAL PAPER
Seismic Bearing Capacity of Strip Foundations on FiberReinforced Granular Soil Amin Keshavarz
. Mehdi Nemati . Abdoreza Fazeli
Received: 5 February 2017 / Accepted: 28 August 2020 Ó Springer Nature Switzerland AG 2020
Abstract The present study investigated the bearing capacity of strip footings on a bed of granular fiberreinforced soils. Analyses were performed by the stress characteristics method (SCM). The failure criterion considers anisotropic distribution of fiber orientation and ignores the rupture of reinforcements. Seismic effects were included in the stress equilibrium equations as the horizontal and vertical pseudo-static coefficients. Stress equilibrium equations were solved by the finite difference method. A computer code was provided to solve the problem. Using the soil and reinforcement input parameters, the code determines the characteristics network and calculates the bearing capacity. The bearing capacity was expressed as the bearing capacity factors of the soil unit weight and surcharge. Parametric analysis was performed to investigate the effect of soil and reinforcement parameters on the bearing capacity and the shape of the failure zone. The outcomes indicated that the SCM results lower ultimate bearing capacity as compared with the upper bound method. Also, the depth of the failure zone increases with an increase in the amount of reinforcement or decrease in the horizontal seismic coefficient. Considering the anisotropic distribution of fiber orientations leads to more bearing capacity than the isotropic distribution. A. Keshavarz (&) M. Nemati A. Fazeli School of Engineering, Persian Gulf University, Bushehr, Iran e-mail: [email protected]
Keywords Bearing capacity Fiber-reinforced soil Seismic effects Stress characteristics method
1 Introduction One of the main issues in geotechnical engineering is to calculate the bearing capacity of shallow foundations. Conventional methods for calculating the bearing capacity include limit equilibrium method (LEM), limit analysis and numerical methods such as finite difference and finite elements analysis. Many studies have been conducted on the seismic behavior of unreinforced soil. Budhu and Al-Karni (1993), Richards et al. (1993), Johari et al. (2017), Conti (2018) and Alzabeebee (2020) evaluated the seismic bearing capacity or settlement of shallow foundations resting on unreinforced soils. Furthermore, Mansour et al. (2016), Dimitriadi et al. (2017, 2018) and Chaloulos et al. (2020) studied the effect of liquefaction on the seismic performance of the footings. In recent decades, natural or polymeric materials have been extensively used for soil reinforcement. In this case, the soil bears more stress because of high tensile strength of reinforcements. There are different types of reinforcements. Some of them such as geogrids or geotextiles are plate-like materials. Fibers are one of the other types of reinforcements. The fibers
123
Geotech Geol Eng
can be very short o
