Lateral earth pressure

About: Lateral earth pressure is a research topic. Over the lifetime, 5334 publications have been published within this topic receiving 62552 citations.

Analysis of the arching action in granular mass

Abstract: When the lining of a tunnel is more flexible than the surrounding soil, the pressure applied to the lining is in general far smaller than the value estimated from the weight of the overburden. Pressure applied to an underground conduit or a trapdoor is also smaller than the weight of overburden. Similarly, earth pressure applied to a retaining wall or to the timbering of an open cut, and particularly to the lower part of the wall or the cut, is sometimes smaller than the values estimated from the theory of earth pressure. Some studies of this arching action to the soil assume that the soil remains in an elastic state; others assume a plastic soil model with a Tresca yield criterion. In this Paper the stress distribution in the soil is analysed assuming that the soil is in a state of plastic equilibrium and that Mohr-Coulomb's failure hypothesis is satisfied. Results are compared with those obtained by measuring the inner air pressure of models made of vinyl tubes or bags buried in dry sand or gravel. Si l...

Face Stability Evaluation of a TBM-Driven Tunnel in Heterogeneous Soil Using a Probabilistic Approach

Abstract: The stability condition of the tunnel face is of great importance in both conventional and modern [tunnel-boring machine (TBM)] methods of construction. Inadequate and excessive amounts of support pressure toward the face lead to surface settlement and blowout, respectively, whereas blowout occurs only in cases of pressurized shield implementation. In this research, the stability condition of a tunnel face excavated by an earth pressure balanced shield (EPBS) in Line 3 of the Tehran subway in Iran was investigated. Considering the sensitivity of urban facilities to ground movement, and to reduce uncertainty, data simulation by Monte Carlo technique was applied. Random data generated through a simulation process were used in an analytical method to calculate the factor of safety and its probability of being less than a predetermined value for a certain amount of applied support pressure. The soil was modeled by finite-element software, and the amount of face pressure at which the face collapses was...

Thermal analysis of energy piles in sand

Abstract: The present work investigates the behaviour of geothermal energy piles in sand subjected to thermal loading and the resulting soil-structure interaction, numerically using the finite element software Abaqus and user-defined material subroutines for soil. The stress-strain response of sand has been simulated using CASM constitutive model based on critical-state soil mechanics. Detailed parametric sensitivity studies have been carried out to understand the effects of different end conditions of the pile, relative densities of the soil, coefficients of lateral earth pressure of the ground, lengths and diameters of the pile, thermal loads, coefficients of friction at the pile-soil interface, critical-state friction angles of soil, thermal conductivity of soil, specific heat of soil and thermal conductivity of the pile on the stress response of soil, deformation of the pile and soil, and strains in the pile. The results show that negative shear stress is generated in the soil at the pile-soil interface. In the...