Full-Scale Field Trials of Tire Shreds as Lightweight Retaining Wall Backfill Under At-Rest Conditions

1998 ◽  
Vol 1619 (1) ◽  
pp. 64-71 ◽  
Author(s):  
Jeffrey J. Tweedie ◽  
Dana N. Humphrey ◽  
Thomas C. Sandford
Keyword(s):  
Retaining Wall ◽  
Fluid Pressure ◽  
Earth Pressure ◽  
Horizontal Stress ◽  
Full Scale ◽  
Wall Friction ◽  
Test Facility ◽  
Design Parameters ◽  
Interface Shear ◽  
Tire Shreds

A 4.88-m (16-ft), full-scale retaining wall test facility was constructed to investigate the use of tire shreds as backfill for conventional retaining walls. The facility can test backfill at at-rest and active conditions and is instrumental for measuring horizontal stress and interface shear. Tire shreds from three suppliers were tested. The results for at-rest conditions are presented. The average at-rest horizontal stress for tire shreds was about 45 percent less than expected for conventional granular backfill. Moreover, the at-rest horizontal stress was about the same for tire shreds from the three suppliers. Design parameters were developed by using two procedures. The first used the coefficient of lateral earth pressure and the other was based on equivalent fluid pressure. The horizontal and shear forces acting on the concrete face of the wall were used to determine the angle of wall friction, which ranged from 30° to 32° for tire shreds from the three suppliers.

Formulation of Seismic Passive Resistance of Retaining Wall Backfilled with c-F Soil

2012 ◽  
Vol 3 (2) ◽  
pp. 15-24 ◽  
Author(s):  
Sima Ghosh
Keyword(s):  
Retaining Wall ◽  
Pressure Coefficient ◽  
Earth Pressure ◽  
Friction Angle ◽  
Wall Friction ◽  
Unit Weight ◽  
Passive Resistance ◽  
Angle Of Internal Friction ◽  
Variation Of Parameters ◽  
Wide Range

Knowledge of passive resistance is extremely important and it is the basic data required for the design of geotechnical structures like the retaining wall moving towards the backfill, the foundations, the anchors etc. An attempt is made to develop a formulation for the evolution of seismic passive resistance of a retaining wall supporting c-F backfill using pseudo-static method. Considering a planar rupture surface, the formulation is developed in such a way so that a single critical wedge surface is generated. The variation of seismic passive earth pressure coefficient are studied for wide range of variation of parameters like angle of internal friction, angle of wall friction, cohesion, adhesion, surcharge, unit weight of the backfill material, height and seismic coefficients.

scholarly journals Effect of Wall Inclination on Dynamic Active Thrust for Cohesive Soil Backfill

2018 ◽  
Vol 9 (2) ◽  
pp. 6 ◽  
Author(s):  
A. Gupta ◽  
V. Yadav ◽  
V. A. Sawant ◽  
R. Agarwal
Keyword(s):  
Retaining Wall ◽  
Earth Pressure ◽  
Cohesive Soil ◽  
Retaining Walls ◽  
Wall Friction ◽  
Cohesionless Soil ◽  
Active Earth Pressure ◽  
Seismic Active Earth Pressure ◽  
Design Charts ◽  
Seismic Loadings

Design of retaining walls under seismic conditions is based on the calculation of seismic earth pressurebehind the wall. To calculate the seismic active earth pressure behind the vertical retaining wall, many researchers reportanalytical solutions using the pseudo-static approach for both cohesionless and cohesive soil backfill. Design charts havebeen presented for the calculation of seismic active earth pressure behind vertical retaining walls in the non-dimensionalform. For inclined retaining walls, the analytical solutions for the calculation of seismic active earth pressure as well as thedesign charts (in non-dimensional form) have been reported in few studies for c-ϕ soil backfill. One analytical solution forthe calculation of seismic active earth pressure behind inclined retaining walls by Shukla (2015) is used in the present studyto obtain the design charts in non-dimensional form. Different field parameters related with wall geometry, seismic loadings,tension cracks, soil backfill properties, surcharge and wall friction are used in the present analysis. The present study hasquantified the effect of negative and positive wall inclination as well as the effect of soil cohesion (c), angle of shearingresistance (ϕ), surcharge loading (q) and the horizontal and vertical seismic coefficient (kh and kv) on seismic active earthpressure with the help of design charts for c-ϕ soil backfill. The design charts presented here in non-dimensional form aresimple to use and can be implemented by field engineers for design of inclined retaining walls under seismic conditions. Theactive earth pressure coefficients for cohesionless soil backfill achieved from the present study are validated with studiesreported in the literature.

Earth Pressure Analysis and Retaining Walls

2015 ◽  
pp. 313-410
Keyword(s):  
Retaining Wall ◽  
Earth Pressure ◽  
Retaining Walls ◽  
Wall Friction ◽  
Underground Structures ◽  
Retaining Structure ◽  
Earth Pressures ◽  
Braced Excavations ◽  
Surcharge Load ◽  
Line Loads

Retaining walls are structures used not only to retain earth but also water and other materials such as coal, ore, etc. where conditions do not permit the mass to assume its natural slope. In this chapter, after considering the types of retaining wall, earth pressure theories are developed in estimating the lateral pressure exerted by the soil on a retaining structure for at-rest, active, and passive cases. The effect of sloping backfill, wall friction, surcharge load, point loads, line loads, and strip loads are analyzed. Karl Culmann's graphical method can be used for determining both active and passive earth pressures. The analysis of braced excavations, sheet piles, and anchored sheet pile walls are considered and practical considerations in the design of retaining walls are treated. They include saturated backfill, wall friction, stability both external and internal, bearing capacity, and proportioning the dimensions of the retaining wall. Finally, a brief treatment of earth pressure on underground structures is included.

scholarly journals Impact of wall movements on the location of passive Earth thrust

2021 ◽  
Vol 13 (1) ◽  
pp. 570-581
Author(s):  
Meriem F. Bouali ◽  
Mahdi O. Karkush ◽  
Mounir Bouassida
Keyword(s):  
Retaining Wall ◽  
Earth Pressure ◽  
Friction Angle ◽  
Retaining Walls ◽  
General Assumption ◽  
Wall Friction ◽  
Wall Movement ◽  
Numerical Predictions ◽  
Test Models ◽  
Earth Pressures

Abstract The general assumption of linear variation of earth pressures with depth on retaining structures is still controversial; investigations are yet required to determine those distributions of the passive earth pressure (PEP) accurately and deduce the corresponding centroid location. In particular, for rigid retaining walls, the calculation of PEP is strongly dependent on the type of wall movement. This paper presents a numerical analysis for studying the influence of wall movement on the PEP distribution on a rigid retaining wall and the passive earth thrust location. The numerical predictions are remarkably similar to existing experimental works as recorded on scaled test models and full-scale retaining walls. It is observed that the PEP varies linearly with depth for the horizontal translation, but it is nonlinear when the movement is rotational about the top of the retaining wall. When rotation is around the top of the wall, the resultant of PEP is located at a depth that varies between 0.164 and 0.259H of the wall height measured from the base of the wall, which is lesser than 1/3 of the wall height. The passive earth thrust location is highly affected by the soil–wall friction angle, especially when the friction angle of the backfill material increases. Despite the herein presented results, further experiments are recommended to assess the corresponding numerical predictions.

Response of buried steel pipelines subjected to relative axial soil movement

2009 ◽  
Vol 46 (7) ◽  
pp. 735-752 ◽  
Author(s):  
Dharma Wijewickreme ◽  
Hamid Karimian ◽  
Douglas Honegger
Keyword(s):  
Earth Pressure ◽  
Axial Direction ◽  
Full Scale ◽  
Interface Shear ◽  
Dense Sand ◽  
Pullout Resistance ◽  
Soil Movement ◽  
Pullout Testing ◽  
Research Findings ◽  
Dry Sand

The performance of buried steel pipelines subjected to relative soil movements in the axial direction was investigated using full-scale pullout testing in a soil chamber. Measured axial soil loads from pullout testing of pipes buried in loose dry sand were comparable to those predicted using guidelines commonly used in practice. The peak values of axial pullout resistance observed on pipes buried in dense dry sand were several-fold (in excess of 2 times) higher than the predictions from guidelines; the observed high axial pullout resistance is primarily due to a significant increase in normal soil stresses on the pipelines, resulting from constrained dilation of dense sand during interface shear deformations. This reasoning was confirmed by direct measurement of soil stresses on pipes during full-scale testing and numerical modeling. The research findings herein suggest that the use of the coefficient of lateral earth pressure at-rest (K0) to compute axial soil loads, employing equations recommended in common guidelines, should be undertaken with caution for pipes buried in soils that are likely to experience significant shear-induced dilation.

Seismic active earth pressure behind a nonvertical retaining wall using pseudo-dynamic analysis

2008 ◽  
Vol 45 (1) ◽  
pp. 117-123 ◽  
Author(s):  
Priyanka Ghosh
Keyword(s):  
Dynamic Analysis ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Failure Surface ◽  
Friction Angle ◽  
Wall Friction ◽  
Active Earth Pressure ◽  
Nonlinear Variation ◽  
Seismic Active Earth Pressure ◽  
Planar Failure

This note describes a study on the seismic active earth pressure behind a nonvertical cantilever retaining wall using pseudo-dynamic analysis. A planar failure surface has been considered behind the retaining wall. The effects of soil friction angle, wall inclination, wall friction angle, amplification of vibration, and horizontal and vertical earthquake acceleration on the active earth pressure have been explored in this study. Unlike the Mononobe–Okabe method, which incorporates pseudo-static analysis, the present analysis predicts a nonlinear variation of active earth pressure along the wall. The results have been compared with the existing values in the literature.

scholarly journals The Mechanics of Arching in Induced Trench Construction – A New Theoretical Formulation

2021 ◽  
Author(s):  
Campbell Bryden ◽  
Kaveh Arjomandi ◽  
Arun J. Valsangkar
Keyword(s):  
Case Studies ◽  
Pressure Coefficient ◽  
Earth Pressure ◽  
Horizontal Stress ◽  
Full Scale ◽  
Theoretical Formulation ◽  
Finite Element Software ◽  
Lateral Earth Pressure ◽  
Earth Pressure Coefficient ◽  
Good Agreement

Full-scale experimental case studies have shown that the induced trench construction method effectively reduces the vertical earth load that is exerted on culverts installed beneath high embankments. Induced trench culverts are traditionally designed on the basis of Marston’s theory; however, various theoretical shortcomings of this formulation have recently come to light. In this paper, a new induced trench theoretical formulation is presented. The proposed analytical model employs inclined shear planes within the embankment fill; such geometry is consistent with experimental findings reported in the literature, and leads to positive arching resulting from a reduction in vertical stress and an increase in horizontal stress (thus increasing the lateral earth pressure coefficient within the induced trench zone). A series of parametric studies are performed using finite element software. The proposed theoretical formulation is shown to be in good agreement with the numerical results, and correlations are developed to provide guidance in selecting the appropriate values of: 1) the induced trench lateral earth pressure coefficient, and 2) the height to the plane of equal settlement. Two instrumented full-scale induced trench case studies are discussed, and the proposed theoretical formulation is shown to produce results that are in good agreement with the experimental data.

Sliding Stability of Retaining Wall Supporting c-Φ Backfill under Pseudo-Statically Seismic Active Load

2013 ◽  
Vol 4 (1) ◽  
pp. 1-16
Author(s):  
Sima Ghosh
Keyword(s):  
Factor Of Safety ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Wall Friction ◽  
Dynamic Factor ◽  
Active Earth Pressure ◽  
Seismic Active Earth Pressure ◽  
Wedge Surface ◽  
Wide Range ◽  
Sliding Stability

The sliding stability of retaining wall is one of the four important stability criteria for the safe design of retaining wall. Here an attempt is made to determine the sliding stability of retaining wall under seismic loading condition supporting c- F backfill considering both soil and wall inertia using pseudo-static method. The analysis for seismic active earth pressure for that particular study is done in such a way to develop a single critical wedge surface which is more realistic. The effect of wide range of variation of parameters like angle of internal friction of soil, angle of wall friction, cohesion, adhesion, seismic acceleration are studied on normalized seismic active earth pressure variation, wall inertia factor, thrust factor, combined dynamic factor and dynamic factor of safety against sliding. Results are presented in terms of formula for critical wedge surface and seismic active earth pressure and non-dimensional charts for the variation of different factors. Finally, a failure zone against sliding is recommended in the Factor of safety against sliding charts.

Pseudo-Dynamic Evolution of Seismic Passive Earth Force and Pressure Behind Retaining Wall

2011 ◽  
Vol 2 (2) ◽  
pp. 1-15
Author(s):  
Sima Ghosh
Keyword(s):  
Dynamic Method ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Friction Angle ◽  
Wall Friction ◽  
Dynamic Evolution ◽  
Linear Variation ◽  
Passive Earth Pressure ◽  
Non Linear ◽  
Surface Inclination

This paper presents a detailed study on the seismic passive earth pressure behind a non-vertical cantilever retaining wall supporting inclined backfill, using pseudo-dynamic method. In addition to the consideration of wall and backfill surface inclination, the soil friction angle, wall friction angle, and both horizontal and vertical seismic coefficients are taken into account. From the obtained results, a non-linear variation of passive earth pressure along the height of the wall is observed. The results compare well with the existing values in research.

Study of Seismic Design Method for Slope Supporting Structure of Soil Nailing

2013 ◽  
Vol 353-356 ◽  
pp. 2073-2078
Author(s):  
Tian Zhong Ma ◽  
Yan Peng Zhu ◽  
Chun Jing Lai ◽  
De Ju Meng
Keyword(s):  
Seismic Design ◽  
Calculation Method ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Calculation Model ◽  
Soil Nailing ◽  
Case Record ◽  
Analysis And Design ◽  
Supporting Structure ◽  
Earthquake Action

Slope anchorage structure of soil nail is a kind of economic and effective flexible slope supporting structure. This structure at present is widely used in China. The supporting structure belong to permanent slope anchorage structure, so the design must consider earthquake action. Its methods of dynamical analysis and seismic design can not be found for the time being. The seismic design theory and method of traditional rigidity retaining wall have not competent for this new type of flexible supporting structure analysis and design. Because the acceleration along the slope height has amplification effect under horizontal earthquake action, errors should be induced in calculating earthquake earth pressure using the constant acceleration along the slope height. Considering the linear change of the acceleration along the slope height and unstable soil with the fortification intensity the influence of the peak acceleration, the earthquake earth pressure calculation formula is deduced. The soil nailing slope anchorage structure seismic dynamic calculation model is established and the analytical solutions are obtained. The seismic design and calculation method are given. Finally this method is applied to a case record for illustration of its capability. The results show that soil nailing slope anchorage structure has good aseismic performance, the calculation method of soil nailing slope anchorage structure seismic design is simple, practical, effective. The calculation model provides theory basis for the soil nailing slope anchorage structure of seismic design. Key words: soil nailing; slope; earthquake action; seismic design;

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