The geometry of the soil nailed slope used for the numerical simulation is given in the Fig.1. The Mohr-Coulomb model is used to model soil and for nails along with facing elements, an elastic model is used.
It is well established that the accuracy of numerical simulations depends significantly on the constitutive soil model used and the selection of the appropriate corresponding model parameters.ĪPPLICATION OF PLAXIS 2D FOR SIMULATION OF A SOIL NAILED SLOPEįor the numerical simulation, two-dimensional finite element code PLAXIS is used.
Consequently, in practice, often numerical simulations are performed using rigorous computational codes based on numerical techniques such as finite element method, discrete element method (e.g. As construction proceeds from the top to bottom, shotcrete or concrete is also applied on the excavation face to provide continuity.Ĭonventional soil nailing design procedures based on limit equilibrium methods fail to address the complex mutual interaction between its main components which affects the performance of soil nail. Soil nailing is also used as temporary shoring for basement excavations and as permanent and temporary earth support for excavations associated with railroads and tunnels. The technique is also used for construction of permanent retaining walls, slope stabilization, underpinning, and protection of existing cuts. Soil nailing consists of the passive reinforcement (i.e., no post-tensioning) of existing ground by installing closely spaced steel bars (i.e., nails), which are subsequently encased in grout. Parameters of soil nail wall used for numerical simulation Horizontal and vertical spacing (SH x SV)Įlasticity modulus of grout (M20 concrete) Eg Table I provides the typical values of various properties of in-situ soil, nails and facing elements used for simulation. Input parameter definitions in PLAXIS require averaging the effect of a three-dimensional problem to a two-dimensional problem.Īt this stage, the soil parameters and other pre-determined variables are used as inputs to run the slope stability analysis using PLAXIS software. KeywordsIn-Situ Earth Retaining Technique, PLAXIS 2D, Base Heave Subsequently the response of the system for the effect of berm provision in the construction, nail configuration, and base heave are also included herein this work. A detailed parametric study is conducted to substantiate the general characteristics of a soil nail system.
On quantifying the improvement of the slope stability after nail installation, it is observed that lateral deformation is reduced by about 41 percent and factor of safety is increased by almost 1.2 times that of slope without nail. A critical comparative study is accomplished for the cut with and without nails. A model is generated for a 10m vertical cut in lateritic soil with horizontal nails installed. In this study, PLAXIS 2D is employed for the comprehensive study of nailed soil structures. Chandrakaran Department of Civil EngineeringĪbstract Soil nailing is an in-situ earth retaining technique excessively used all over the world for the various slope stability applications. Midhula Jayanandan Department of Civil Engineering NIT Calicut Numerical Simulation of Soil Nailed Structures