An-Najah National University Faculty of Engineering Civil Engineering

An-Najah National University Faculty of Engineering Civil Engineering

An-Najah National University Faculty of Engineering Civil Engineering Department. {Graduation Project} By: Adie Qashoua Yazan Zubaida

Amer Qawariq Supervisor: Ph.D. Isam Jardaneh 2011 Soil Reinforcement Mechanically Stabilized Retaining Wall

Project Outline CHAPTER 1 Introduction CHAPTER 2 Literature Review of Soil Reinforcement CHAPTER 3 Mechanically Stabilized Retaining Wall CHAPTER 4 Design of Conventional Retaining Wall

CHAPTER 5 Design of Mechanically Stabilized Retaining Wall. CHAPTER 6 Quantities and Cost Comparison General View Reinforced earth is an expression

used by specialized soil

reinforcement companies that refers to the combination of geotechnical and structural engineering principles. History of Soil Reinforcement Modern Structures

The modern concept of the soil reinforcement and soil structure was proposed by Casagrande.

The modern form of earth reinforcement was introduced by Vidal in the 1960s. Vidals concept Application of

Soil Reinforcement There are many applications of soil reinforcement such as : 1) Bridge abutments. 2) Bridge abutments with piled

bankseat. 3) Sloping bridge abutments. 4) Embankments. 5) Dams. Bridge abutment

Bridge Abutment with Piled Bankseat Sloping Bridge Abutment Embankment Dam

Advantages and Disadvantages of Soil Reinforcement Advantages of Soil Reinforcement

1. Allow in-situ strengthening on existing slope surface. 2. Allow excellent working space in front of the excavation face. 3. Avoid unnecessary temporary works. 4. Only requires light machinery and equipment.

Disadvantages of Soil Reinforcement 1. Less suitable for course grained soil and soft clayey soil. 2. Suitable only for excavation above groundwater. Mechanically

Stabilized Retaining Wall General Definition It is

a new Geotechnical technology

that reinforcement materials to

backfill of reinforce the

retaining walls. uses Construction Components Metallic Facing System. reinforcement.

Facing Connection. Backfill Materials. Facing System Metallic reinforcement Facing Connection

Backfill Materials Design of Mechanically Stabilized Retaining wall

Dimensions and Soil Properties Internal and External Stability Internal Stability External Stability Horizontal Spacing

1m FS (Siding) 3.57 Vertical Spacing

0.5 m FS (Overturning) 27.3 Maximum Tie Force

24.33 KN FS (Bearing Capacity) 5.83 Thickness of Tie ( t ) 6 mm Length of Tie (L) 13 m

Conventional Retaining Walls Definition Conventional retaining walls are classified as the earliest

supporting systems used at excavation sites, soil slopes, highway beds and bridge abutments. Types of Conventional Retaining Walls Design

of Conventional Retaining Wall External Stability Check Internal Stability

(Steel Distribution) Quantities and Cost Comparison Mechanically Conventional

Stabilized Retaining Retaining Wall Wall Quantity Cost Quantity Cost Steel

0.56 ton 1792 NIS 0.639 Ton 2045 NIS No. of Concrete/ Concrete 1796 NIS Facing 700 NIS Facing 6.1 Cm

14 Backfill material is Backfill 18.2 Cm 145.6 NIS used from the site Total Cost 3707 NIS 2745 NIS

Thank You For Your Listening

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