Laboratory and numerical investigation of machine foundations reinforced with geogrids and geocells

Venkateswarlu, Hasthi; Ujjawal, K.N.; Hegde, A.

doi:10.1016/j.geotexmem.2018.08.006

Cited by 93 publications

(29 citation statements)

References 44 publications

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“…The initial void ratio was obtained from the relationship between dry unit weight, specific gravity, and void ratio. The geocell reinforced sand layer was modeled as Geocell-soil composite layer with improved stiffness and strength parameters (Rajagopal et al, 1999;Dash et al, 2003;Venkateswarlu et al, 2018;Ujjawal et al, 2019). The properties of the geocell composite layer were calculated using the equivalent composite approach (ECA), as suggested by Latha et al (2009).…”

Section: Numerical Analysismentioning

confidence: 99%

Performance of Geosynthetics Reinforced Subgrade Subjected to Repeated Vehicle Loads: Experimental and Numerical Studies

Hegde

Palsule

2020

Front. Built Environ.

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Use of the geosynthetics to strengthen the soil is one of the highly desirable techniques under static and dynamic loads. The present study describes the experimental and numerical studies performed on the geosynthetic reinforced subgrade subjected to repeated vehicle loads. The cyclic plate load tests were conducted on the sand subgrade reinforced with planar and 3D geosynthetic reinforcements. The vehicle load was simulated by applying a repeated load of magnitude 275 kPa with 1 Hz frequency on the reinforced subgrade. Results of the experimental investigations revealed that the performance of the subgrade soil improved significantly in the presence of reinforcements. The estimated parameters illustrated the three-fold reduction in settlement of the subgrade in the presence of reinforcement. Further, the heaving of the subgrade soil was found completely arrested with the use of geosynthetic reinforcement. The three-dimensional geocell reinforcement performed effectively as compared to planar geogrids under dynamic load. The measured pressure values at different depth demonstrated a significant reduction in the pressure in the presence of reinforcements. Besides, numerical simulations were performed using PLAXIS 2D to understand pressure and settlement distribution patterns in the reinforced subgrade. In overall, a good agreement was observed between numerical and experimental results.Abbreviations: B, width of geocell mattress (mm); C, cohesion of unreinforced sand (kPa); C c , coefficient of curvature (dimensionless); C r , increased apparent cohesion (kPa); C u , uniformity coefficient (dimensionless); C , total apparent cohesion (kPa); d 0 , equivalent geocell pocket diameter (mm); D, width of loading plate (mm); D 10 , effective particle size (mm); δ, soil surface settlement (mm); e min , minimum void ratio (dimensionless); e max , maximum void ratio (dimensionless); E, young's modulus of elasticity (kPa); ε a , axial strain (dimensionless); G, shear modulus (kPa); G s , specific gravity of sand (dimensionless); γ d , dry unit weight (kN/m 3 ); h, height of geocell (mm); H, height of sand bed (mm); k p , coefficient of passive earth pressure (dimensionless); M, secant modulus of geocell material (kPa); N r , number of loading cycles for reinforced case (dimensionless); N u , number of loading cycles for unreinforced case (dimensionless); r, radial distance from the center of loading plate (mm); S 0 , settlement of unreinforced subgrade (mm); S r , settlement of reinforced subgrade (mm); σ n , horizontal stress increment (kPa); σ ' yy , vertical effective stress (kPa); w, specific weight (kN/m/m); W, width of the sand bed (mm); µ, poisson's ratio (dimensionless); z, depth of geocell (mm); α/β, rayleigh damping parameters (dimensionless); φ, angle of internal friction (degrees); ψ, dilatancy angle (degrees).Frontiers in Built Environment | www.frontiersin.org 1 February 2020 | Volume 6 | Article 15

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Section: Numerical Analysismentioning

confidence: 99%

Performance of Geosynthetics Reinforced Subgrade Subjected to Repeated Vehicle Loads: Experimental and Numerical Studies

Hegde

Palsule

2020

Front. Built Environ.

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“…Few researchers suggested that the subgrade stiffening not only mitigate the traffic vibration but also reduces the track settlement and deflections (Ekanayake et al, 2014;Thompson et al, 2015). The techniques adopted for stiffening the subgrade are vibro-compaction, jet grouting, vibro-replacement, excavation and replacement, stabilization, and reinforced earth (Thompson et al, 2015;Venkateswarlu et al, 2018a). Coulier et al (2015) investigated the efficacy of jet grout columns in mitigating the rail induced vibration through the field and numerical investigation.…”

Section: Type Of Vehicle Train Truck Bus Carmentioning

confidence: 99%

“…The numerical evaluation of Azzam (2015) found that the presence of confined cell could effectively mitigate the amplitude of vibration through increasing the damping of a subgrade. Venkateswarlu et al (2018a) reported that increase in elastic response of foundation bed due to the inclusion of geocells. Few studies reported the potential using the geocell in mitigating the lateral spreading of machine induced vibration (Venkateswarlu and Hegde, 2018;Venkateswarlu et al, 2018b).…”

Section: Type Of Vehicle Train Truck Bus Carmentioning

confidence: 99%

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Mitigation of Traffic Induced Vibration Using Geocell Inclusions

Hegde

Venkateswarlu

2019

Front. Built Environ.

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This paper describes the potential use of geocell reinforcement in mitigating the traffic induced vibration. The vibration caused by the vehicular movement was simulated over the unreinforced and geocell reinforced sections using a mechanical oscillator. The displacement amplitude and peak particle velocity were measured to understand the vibration mitigation efficacy of geocell. The effect of depth of placement of geocell on the mitigation of vibration parameters was studied. The inclusion of geocell was found effective in reducing the induced vibration based on the experimental results. The vibration mitigation efficacy of geocell was improved significantly at the shallow depth of placement of geocell mattress. The improvement in elasticity of the subgrade was observed maximum when the geocell was placed at a depth of 0.1B from the ground surface. Further, analytical and numerical approaches were used to predict the displacement amplitude vs. frequency response of reinforced soil sections. FLAC3D was used for performing the numerical investigation. The geocell was modeled according to its honeycomb shape to acquire the accurate response of geocell reinforced section. Whereas, mass spring dashpot analogy was followed for the analytical evaluation. In overall, the amplitude response predicted from the numerical and analytical studies were found to be in good agreement with the experimental results.

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“…The vibrations are well controlled by geocell reinforcement. Venkateswarlu et al [20] have compared the displacement behaviour of geogrids and geocell reinforcement and concluded that geocell have less displacement compare with geogrids. The bearing capacity of circular rigid foundations increases when the reinforcement and the friction angle increases.…”

Section: Foundations In Soft Soilmentioning

confidence: 99%

Applications and Performance of Geogrids in Structures

Balaji*,

Vinodhkumar,

Ridhuvarsine

2019

IJRTE

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A type of geosynthetic material named geogrid plays a pivotal role in the behaviour of concrete by implementing them as an additional reinforcement. Geogrids have good tensile strength as they are formed by the reticulation of tensile elements with an opening of an ample size which allows interlock with the nearby fill materials. These grids are flexible mesh which is highly effective and enhances the life of the structure. The prime constituents of geogrid are polyester, high-density polyethylene, and polypropylene. More often, in the field of civil engineering,uni-axial, bi-axial and tri-axial geogrids are used. As the cost and duration of construction are nominal, geogrids can be optedfor cost-effective and resilient construction. They are frequently used as reinforcement and for stabilization in structures like retaining walls, pavements, foundations, slopes, and embankments. The geogrids are employed in various construction which results in sustainable development. Thus, this paper discusses diverse studies that have been carried out by using different types of geogrids for various purposes by different research scholars

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Laboratory and numerical investigation of machine foundations reinforced with geogrids and geocells

Cited by 93 publications

References 44 publications

Performance of Geosynthetics Reinforced Subgrade Subjected to Repeated Vehicle Loads: Experimental and Numerical Studies

Performance of Geosynthetics Reinforced Subgrade Subjected to Repeated Vehicle Loads: Experimental and Numerical Studies

Mitigation of Traffic Induced Vibration Using Geocell Inclusions

Applications and Performance of Geogrids in Structures

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