A Study on Interfacial Friction Between Rockflour and Geotextiles

A STUDY ON INTERFACIAL FRICTION BETWEEN ROCK FLOUR WITH GEOTEXTILES
INTRODUCTION
 Interfacial friction angle developed by a fill material with reinforcing material plays a vital role in the design of reinforced soil structures.
 Frictional fills are preferred over cohesive frictional fills.
 The cost of reinforced earth construction can be reduced significantly by using cost effective material as fill.
 The present work is intended to assess the potential of rock flour, a waste material available at rock crushing plants for use as fill material.
 Extensive laboratory investigations are to be carried out on rock flour samples collected to evaluate engineering properties & frictional characteristics of the material with synthetic geo fabrics.
 Discussion is made on the test results.
LITERATURE REVIEW
 Reinforced earth technique is now   gaining popularity in construction of various civil engineering structures.
 The success of the technology mainly depends on the type of fill material and its interaction with reinforcing material used.
 Generally, granular soils are preferred over silts and clays in the construction as they exhibit higher values of friction coefficients.
              The effective angle of internal friction should not be less than 250  
Gradation specifications:
• % of fines < 10
• Uniformity coefficient > 5
 Mobilized friction parameters of synthetic fabrics are effected by surface texture, thickness of fabric as well as type, density and moisture content of soils.
 Mobilized friction angle ranges from 0.75 to 0.90 times the friction angle of soils.
Modified shear box test’s are conducted to study the interfacial angle
FOR ROCK FLOUR
 Specific Gravity :
            To determine specific gravity of the rock flour.
 Grain Size Analysis :
            To determine the percentage of individual grain size present in the rock flour sample.
 Compaction Test :
  IS-Light compaction & IS-Heavy compaction...