scholarly journals Reviewing the Possibility of Using Marginal Soils as Backfill Materials for Mechanically Stabilized Earth Retaining Walls

2021 ◽  
Vol 856 (1) ◽  
pp. 012024
Author(s):  
Ahmed Sabah Aljawadi ◽  
Malik H. Assi ◽  
Noor. S. Taresh
Keyword(s):  
Retaining Walls ◽  
Mechanically Stabilized Earth ◽  
Marginal Soils ◽  
Backfill Materials ◽  
Mechanically Stabilized

Experimental Testing of Retaining Walls of Precast Elements

2015 ◽  
Vol 725-726 ◽  
pp. 168-175
Author(s):  
Zoran Bonić ◽  
Nebojša Davidović ◽  
Verka Prolović ◽  
Nikola Romić ◽  
Nikolay Vatin
Keyword(s):  
Experimental Testing ◽  
Retaining Walls ◽  
Dynamic Loads ◽  
Future Research ◽  
Mechanically Stabilized Earth ◽  
Static Loads ◽  
Retaining Structures ◽  
Mechanically Stabilized ◽  
Precast Elements ◽  
Construction Practice

In contemporary construction practice is increasingly being applied flexible retaining structures of mechanically stabilized earth, gabions and precast elements. Although widely used only recently, their benefits are proven and widely accepted. The first part of the paper provides an overview of the possible ways of using of precast elements in the construction of retaining walls. The second part gives a detailed overview of the experimental testing of stability of retaining walls of prefabricated betonblok elements. The effect of static loads on the wall was examined in the first, and the effect of the dynamic loads in the second experiment. The results are analyzed and recommendations for future research are given.

Crash Wall Design to Protect Mechanically Stabilized Earth Retaining Walls

2013 ◽  
Vol 2377 (1) ◽  
pp. 49-60
Author(s):  
Akram Y. Abu-Odeh ◽  
Kang-Mi Kim
Keyword(s):  
Structural Damage ◽  
Retaining Wall ◽  
Retaining Walls ◽  
Wall Structure ◽  
Mechanically Stabilized Earth ◽  
Element Analysis ◽  
Wall Panels ◽  
Mse Wall ◽  
Mechanically Stabilized ◽  
Earth Fill

Mechanically stabilized earth (MSE) retaining walls are used to provide roadway elevation for bridge approaches, underpass frontage roads, and other roadway elevation applications. Vehicular traffic may exist on the high (fill) side of the MSE retaining wall, the low side, or both sides. For traffic on the high side, a conventional traffic barrier might be placed on or near the top of the wall and mounted on a moment slab or a bridge deck. For traffic on the low side, a conventional traffic barrier might be installed adjacent to the wall or the wall itself may serve as the traffic barrier. Typical MSE wall panels are not designed to resist vehicle impacts. Therefore, structural damage to the wall panels and the earth fill would require complicated and expensive repairs. A simple reinforced-concrete crash wall constructed in front of the MSE wall panels could significantly reduce damage to the panels. It might prove practical to implement such a design to reduce costly repairs to the MSE wall structure. In this paper, LS-DYNA finite element analysis code was used to model and analyze a sacrificial crash wall design to determine its effectiveness in protecting an MSE retaining wall. Based on the LS-DYNA simulations, a crash wall that is 8 in. (0.2 m) thick is considered to be an adequate design to reduce damage to the MSE wall.

MODELING OF MECHANICALLY STABILIZED EARTH RETAINING WALLS AND THEIR DYNAMIC ANALYSIS

2018 ◽  
Author(s):  
Bojana Grujić ◽  
Igor Jokanović ◽  
Sabid Zekan ◽  
Žarko Grujić ◽  
Mila Svilar
Keyword(s):  
Dynamic Analysis ◽  
Retaining Walls ◽  
Mechanically Stabilized Earth ◽  
Mechanically Stabilized

Evaluation and Recommendations for Flowfill and Mechanically Stabilized Earth Bridge Approaches

2008 ◽  
Vol 2045 (1) ◽  
pp. 51-61
Author(s):  
Naser M. Abu-Hejleh ◽  
Dennis Hanneman ◽  
Trever Wang ◽  
Ilyess Ksouri
Keyword(s):  
Filter Material ◽  
Soil Mass ◽  
Reinforced Soil ◽  
Mechanically Stabilized Earth ◽  
Repair Costs ◽  
Bridge Approach ◽  
Class B ◽  
Class 1 ◽  
Backfill Materials ◽  
Mechanically Stabilized

To alleviate the common bridge bump problem, the Colorado Department of Transportation (CDOT) has employed three new alternatives for bridge abutment backfill since 1992: flowfill, mechanically stabilized earth (MSE) using well-graded granular Class 1 backfill (reinforced soil mass as in MSE walls), and MSE using free-draining Class B filter material. However, the occurrence of bridge bump problems is still reported. A study evaluated CDOT current practice for design and construction of bridge approaches and then developed recommendations to improve this practice (improve performance and reduce costs) on the basis of the results of the following: (a) best practices for bridge approaches collected from CDOT staff and reported in the literature, (b) evaluation of the performance and cost-effectiveness of Colorado's MSE and flowfill bridge approaches, and (c) identification of the causes of significant bridge approach settlement problems observed in some of Colorado's MSE and flowfill bridge approaches. Evaluation procedures and forensic investigations were developed and applied to obtain the information needed for the first two items. Flowfill should remain a viable alternative for certain field and construction scenarios that justify its higher costs. MSE approaches with both Class B and Class 1 backfill materials should be routinely used in future CDOT projects with documentation of their performance and cost (construction and repair costs) for a future evaluation. Comprehensive recommendations are presented to mitigate the observed bridge approach settlement problem; the most important recommendations are for improved support and drainage systems for the sleeper slab where the settlement problem occurs.

A Process for Optimizing Gradation of Marginal Backfill of Mechanically Stabilized Earth Walls to Achieve Acceptable Resistivity

2018 ◽  
Vol 2672 (52) ◽  
pp. 251-257 ◽  
Author(s):  
Jose Luis Arciniega ◽  
W. Shane Walker ◽  
Soheil Nazarian ◽  
Kenneth L. Fishman
Keyword(s):  
Corrosion Rate ◽  
Fine Sand ◽  
Coarse Sand ◽  
Mechanically Stabilized Earth ◽  
Mechanically Stabilized Earth Walls ◽  
Texas Department ◽  
Backfill Materials ◽  
Mechanically Stabilized ◽  
Sand And Gravel ◽  
Earth Walls

The service life of mechanically stabilized earth walls depends on the corrosion rate of the metallic reinforcement used in their construction. The resistivity of the backfill aggregates needs to be measured accurately to estimate realistically the corrosion rate of the reinforcement. Resistivity testing is usually performed using the traditional soil box on the portion of the aggregates that passes a No. 10 or No. 8 sieve to either select or reject the backfill. For a more reasonable characterization of the corrosivity of coarse backfills, it is desirable to use their actual gradations. To that end, several resistivity boxes that were double and quadruple the dimensions of the original box were constructed. In addition to the three standard gradations specified by the Texas Department of Transportation, over 20 backfill materials sampled from sources throughout Texas were fractionated to fines, fine sand, coarse sand, and gravel. Resistivity tests were performed separately on each of these four constituents for each backfill. The results were used to evaluate a relationship that would allow the estimation of the resistivity of any desired backfill gradations from the resistivity values of these four constituents. The proposed model looks promising since the resistivity of the backfill composed of the actual gradation can be estimated with reasonable certainty. The results of this study can potentially help highway agencies and contractors use a number of local quarries that are currently disqualified based on the resistivity values obtained from only testing materials that pass a No. 8 or No. 10 sieve.

Temperature Distribution in Mechanically Stabilized Earth Wall Soil Backfills for Design Under Elevated Temperature Conditions

2015 ◽  
Vol 7 (2) ◽  
Author(s):  
Andrew M. Kasozi ◽  
Raj V. Siddharthan ◽  
Rajib Mahamud
Keyword(s):  
Las Vegas ◽  
Temperature Data ◽  
Measured Temperature ◽  
Mechanically Stabilized Earth ◽  
Ansys Fluent ◽  
Design Procedures ◽  
Model Predictions ◽  
Mse Wall ◽  
Mechanically Stabilized Earth Wall ◽  
Mechanically Stabilized

Two-dimensional (2D) transient numerical thermal modeling was undertaken using ansys fluent v12.1 software to estimate distribution of soil backfill temperatures in a typical mechanically stabilized earth (MSE) wall. The modeling was calibrated using field-measured temperature data from the Tanque-Verde MSE wall in Tucson, Arizona (AZ) in which computed temperature data were found to be within ±5% of the field data. The calibrated model predictions for Las Vegas, Nevada (NV) showed an overall average soil backfill temperature of 34.3 °C relative to a maximum outside surface temperature of 51.6 °C. Such a high average soil backfill temperature calls for modification of design procedures since conventional designs are based on geosynthetic tensile strength determined at 20 °C.

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