Bulletin of Earthquake Science and Engineering

Bulletin of Earthquake Science and Engineering

Numerical Analysis of Lateral Displacement and Bending Moment of Double Anchored Sheet Pile with Embankment Reinforced with Tire Chips in Static and Pseudo-Static Conditions

Document Type : Research Note

Authors
1 Masters student, Department of Civil Engineering, Faculty of Engineering, Qom University of Technology, Qom, Iran.
2 Assistant Professor, Civil Engineering Depatrment, Faculty of Engineering, Qom University of Technology, Qom, Iran
3 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Qom University of Technology, Qom, Iran
Abstract
With the increase of high-rise construction and the use of underground transportation in urban environments, the need to use deep excavation is felt more and more, and the use of a sheet pile wall is one of the practical methods for stabilizing these excavations. We can use tires in different shapes to reinforce the soils; full waste tire, tire shreds as well as waste tire chips. Different filed studies, laboratories studies and also numerical investigations demonstrate the economic and technical application of these cheap waste materials. It should be mentioned that these waste materials are harmful for the nature if we have no plan for these waste materials. The usage of a mixture of sand and tire chips in the embankment of sheet pile walls with different depths can have different effects on the lateral displacement and maximum bending moment of the double-anchored sheet pile wall. Therefore, in this research, using the characteristics of sandy soil and tire chips with volume ratios of 15 and 30%, the effects of using this mixture in the embankment were investigated in static and pseudo-static conditions by means of different horizontal seismic coefficients for walls with different heights. It is obvious that increasing the back fill’s height increases the bending moment and also the horizontal displacement of the sheet pile. This issue is correct when we use reinforced or unreinforced back fill, but the most important matter that clearly exists in this research, is that using reinforced tire shred-sand, decreases the bending moment and also horizontal displacement. The obtained results demonstrate that this reinforced material with a low weight, in comparison with unreinforced sand, decrease the moment and displacement applying to the sheet pile. It is a key parameter in an economic design of sheet pile. The drainage is another key important in design of retaining walls and sheet piles. This reinforced material creates a good drainage condition for the sheet pile system. All these benefits are available when we use a very cheap and disposal material just behind the sheet piles. The reinforced sand-waste tire shreds, has a flexible behavior in seismic fields. The waste tire shreds with high damping ratio, although it is not studied in this research, decreases the forces, moments and also horizontal displacements against the sheet pile in seismic conditions. It was observed that in static conditions, the use of a mixture of sand and tire chips in the embankment of the wall, instead of full sand embankment leads to a reduction in the lateral displacement and the bending moment of the sheet pile. The lateral displacement and bending moment in the sheet pile, with the increase of the horizontal seismic acceleration coefficient, has shown an increasing trend, but in a constant horizontal seismic acceleration coefficient, by using a mixture of sand and tire chips, the obtained values have decreased, in the meantime, the performance of the mixture with a volume ratio of 30% was better than the performance of the mixture with a volume ratio of 15%. Also, the use of soil reinforced with tire chips, due to the reduction of the bending moment in the sheet pile, leads to a more economical plan for the seismic design of the sheet pile wall. It is very important to compact the sand-waste tire shreds to approach the desired compaction ratio desired for a specific project. Using waste tire shreds with high percent content in a mixed soil, makes the compaction impossible or it may be very hard to reach the desired compaction ratio. Thus it is recommended that using 30% would be a practical and also economic content, to reach the optimum conditions in a real and applicable project in the field.
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  • Receive Date 07 February 2023
  • Revise Date 26 August 2023
  • Accept Date 13 September 2023