Cement-Modified Backfills for Mechanically Stabilized Earth Walls with Built-In Facing

A field study was undertaken to evaluate the performance of model geotextile-reinforced mechanically stabilized earth walls constructed using locally available marginal backfill soils without and with cement modification. Cyclic plate load tests were carried out on the constructed walls both at optimum moisture content and in fully wet conditions in the case of plain backfills and in fully wet condition for cement-modified backfills. The performance and utility of the proposed built-in soil cement facing with folded-back geotextile layers were also examined. The reduction in load-carrying capacity of walls upon wetting could be compensated by cement modification of marginal backfills while maintaining the pullout resistance of reinforcing layers with nominal variation in the flexibility of walls. The performance of model walls constructed using cement-modified marginal backfills is found to be even superior to the wall constructed using free draining sand backfill in terms of higher load-carrying capacity with reduced lateral facing deformations. It was observed that the geotextile-reinforcing layers in marginal backfills also facilitate the internal drainage.

[1]  Thomas F. Zimmie,et al.  Retrofit-reinforcement of cohesive soil slopes using high strength geotextiles with drainage capability , 2005 .

[2]  F Tatsuoka,et al.  CEMENT-MIXED SOIL FOR TRANS-TOKYO BAY HIGHWAY AND RAILWAY BRIDGE ABUTMENTS , 2004 .

[3]  Michael T. Adams,et al.  LARGE MODEL SPREAD FOOTING LOAD TESTS ON GEOSYNTHETIC REINFORCED SOIL FOUNDATIONS , 1997 .

[4]  Christina C. Ma,et al.  Field Performance of an Independent Full-Height Facing Reinforced Soil Wall , 2004 .

[5]  Jean Binquet,et al.  Bearing Capacity Tests on Reinforced Earth Slabs , 1975 .

[6]  Stephanie Glendinning,et al.  Reinforced Soil Using Cohesive Fill and Electrokinetic Geosynthetics , 2005 .

[7]  C S Yoo,et al.  Lessons Learned from a Failure of Geosynthetics-Reinforced Segmental Retaining Wall , 2004 .

[8]  Chung-Sik Yoo,et al.  Case History of Geosynthetic Reinforced Segmental Retaining Wall Failure , 2006 .

[9]  T. Ingold,et al.  A laboratory investigation of grid reinforcements in clay , 1983 .

[10]  Mohammad Jamal Khattak,et al.  Durability and mechanistic characteristics of fiber reinforced soil–cement mixtures , 2006 .

[11]  Robert M. Koerner.  Emerging and Future Developments of Selected Geosynthetic Applications , 2000 .

[12]  T. S. Ingold.  A laboratory simulation of reinforced clay walls , 1981 .

[13]  Richard J. Bathurst,et al.  Failure of a geogrid-reinforced soil wall , 1990 .

[14]  Gordon Keller,et al.  EXPERIENCES WITH MECHANICALLY STABILIZED STRUCTURES AND NATIVE SOIL BACKFILL , 1995 .

[15]  Braja M. Das,et al.  Stabilization of Weak Clay with Strong Sand and Geogrid at Sand-Clay Interface , 1998 .

[16]  Malcolm D. Bolton,et al.  Collapse limit states of reinforced earth retaining walls , 1981 .

[17]  James G. Collin.  LESSONS LEARNED FROM A SEGMENTAL RETAINING WALL FAILURE , 2001 .

[18]  Y H Wang,et al.  Internal stability of reinforced soil retaining structures with cohesive backfills , 1992 .

[19]  Deborah J. Goodings,et al.  Failure of Geotextile-Reinforced Vertical Soil Walls with Marginal Backfill , 2001 .

[20]  Braja M. Das,et al.  MODEL TESTS FOR STRIP FOUNDATION ON CLAY REINFORCED WITH GEOTEXTILE LAYERS , 1987 .