Matakuliah: S0522/ Aplikasi Geosintetik Dalam Teknik Sipil Tahun: Juli 2005 Versi: 01/01 Pertemuan 05 PEMILIHAN MATERIAL GEOTEKSTIL, GEOGRIDS/GEONETS.

Presentasi berjudul: "Matakuliah: S0522/ Aplikasi Geosintetik Dalam Teknik Sipil Tahun: Juli 2005 Versi: 01/01 Pertemuan 05 PEMILIHAN MATERIAL GEOTEKSTIL, GEOGRIDS/GEONETS."— Transcript presentasi:

1 Matakuliah: S0522/ Aplikasi Geosintetik Dalam Teknik Sipil Tahun: Juli 2005 Versi: 01/01 Pertemuan 05 PEMILIHAN MATERIAL GEOTEKSTIL, GEOGRIDS/GEONETS

2 Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu :  Mahasiswa mampu mengkategorikan pemakaian geonets, geogrid dan geotekstil sesuai kebutuhan desain di lapangan  C5

3 Outline Materi Pertimbangan desain Kondisi tanah Analisa pemilihan material Perbandingan penggunaan geotekstil dan geogrid, serta geonets sesuai kebutuhan dan kondisi lapangan Sebagian materi ini diambil dari IGS Lecturer notes No. 9 of 19 Reinforced Soil - Steep Faced Embankments By Jerry Love Geotechnical Consulting Group, UK

4 Lecture Outline 1Application areas and general introduction 2Types of geosynthetics and fill material used 3Review of design methods 4Examples of installation of geosynthetics 5Examples of completed structures

5 Application Areas

6 Highway Widening

7 Temporary Structures

8 Slip Repairs

9 Noise Barriers

10 Use of Poor Quality Fills

11 Summary Reinforcement allows soil structures to be built at angles steeper than the natural angle of repose of the soil Advantages include : –Simple construction methods –Manual handling –Lightweight plant –Cheaper fill material –More rapid construction –Tolerance to differential movement –Visually pleasing structures

12 Types of Geosynthetic Used

13 Geogrid/soil Interlock

14 Woven Geotextiles

15 Non Woven Geotextiles

16 Fill Materials Granular fill Cohesive fill Chalk fill PFA

17 Design Methods

18 Step 1 Establish the geometric, loading, and performance requirements for design: Geometry Loads Performance requirements

19 Step 2 Determine the stratigraphy and engineering properties of the insitu soils in and below the slope: Soil profiles Soil strength parameters, unit weight, and consolidation parameters Groundwater regime Cause of previous instability if applicable

20 Step 3 Determine the engineering properties of the fill material Gradings and plasticity Compaction characteristics and placement requirements Shear strength parameters Chemical composition of soil

21 Step 4 Determine design parameters for the reinforcement. Long-term rupture strength Pull-out strength Direct sliding coefficient

22 Step 5 Determine the factor of safety of the un- reinforced slope: Standard stability analysis computer programs Is reinforcement required? Establish the size of the critical zone to be reinforced

23 Step 6 Establish reinforcement layout Method 1: Direct method using prescriptive design rules or charts Method 2 : Iterative method using trial-and-error technique

24 Two Part Wedge Method (UK Highways)

25 t1 t2 t3 t4 T (available) = t1+t2+t3+t4 T (available) > t (required) Trial Surfaces

26 Typical Reinforcement Layout  Primary reinforcement Secondary reinforcement Main reinforcement wrapped round face

27 Check External Stability

28 Step 8 Evaluate requirements for subsurface and surface water control drains placed at the rear and/or beneath the reinforced zone. Surface water collector drains above the reinforced slope. Front face erosion protection This completes the design process.

29 Typical Installation – by Pushing Fill Forward

30 Placing Fill by Excavator Bucket

31 Steep Faced Slope With Mesh Facing

32 Steep Faced Slope, Soft Face With Berms

33 Green Faced Steep Slope

34 Bridge Abutment

35 Geotextile Wrap Round Face

36 Green Faced Steep Slope