Effect of Flexibility of Geosynthetic Inclusion on The Interface Shear Capacity of Segmental Block System


Md. Zahidul Islam Bhuiyan

Graduate Research Assistant, Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
e-mail: mdzibhuiyan@gmail.com

Faisal Hj. Ali

Professor, Department of Civil Engineering, National Defense University of Malaysia, 57000 Kuala Lumpur, Malaysia
e-mail: fahali@upnm.edu.my

Firas A. Salman

Consulting Engineer, Eliot Sinclair & Partners, Christchurch, New Zealand
e-mail: firasalman@hotmail.com



Geosynthetic reinforced segmental retaining walls (GR-SRWs) are in a period of development and have achieved popularity all over the world because of their many fold advantages. Inclusion of a geosynthetic layer at the interface has great influence on interface frictional performance of segmental retaining wall units.The paper describes the influence of geosynthetic inclusion on interface shear capacity of segmental concrete units. A series of direct shear tests were conducted according to the existing ASTM and National Concrete Masonry Association (NCMA) test protocols to assess the frictional performance of the innovated block system with different types of geosynthetic inclusions. Test results reveal that the presence of geosynthetic layer at the facing unitís (segmental concrete unit) interface reduces the interface shear capacity and it depends on the flexibility of the used geosynthetic reinforcements. For stiff geogrid inclusion, the reduction in friction angle against no-inclusion is about 30.9%. On the other hand, the reductions in friction angle for the presence of flexible geotextile and flexible geogrid are about 15.4% and 2.7% respectively.

Keywords: Geosynthetics, interface shear, segmental concrete block, retaining wall, reinforced soil.

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