Validity of Menard relation in dynamic compaction operations

Ghassemi, Ali; Pak, Ali; Shahir, Hadi

doi:10.1680/grim.2009.162.1.37

Cited by 15 publications

(4 citation statements)

References 22 publications

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“…For engineering design or control aspects, a simple calculation method is still needed. Menard and Broise [9] were the first to propose an equation to calculate the densification depth D = √ W H containing two parameters: the weight of the hammer W and the falling height of the hammer H. Mayne et al [14] added a coefficient n to this equation to adapt it to complex working conditions, and many subsequent studies were conducted to refine the value of this coefficient [2,[15][16][17][18]. However, the shortcomings of this equation are obvious in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Modeling of Ground Displacement Induced by Dynamic Compaction in Granular Soils

Zhang

et al. 2023

Buildings

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Dynamic compaction (DC) is a ground treatment method that achieves soil densification effects using impact forces. The ground displacement of a crater induced by a hammer is often used for the determination of densification, but less attention has been paid to internal displacement in the ground. To establish an overall understanding of the displacements caused by DC, a laboratory experiment was conducted with sand. The experiment included four energy levels by changing the falling height of the hammer. Meanwhile, a calculation model based on stochastic media theory was proposed to calculate the displacement in the soil. The relationship between the geometric characteristics of the crater and the internal displacement of the soil was established in the model based on the experimental results. The ranges of the relevant parameters were determined, and the feasibility of the calculation model was verified. The model showed good consistency with the experimental data. By selecting the critical settlement, the model could be used to estimate the specific densification scope, including the reinforcement depth and radius. This method can provide a reference for the calculation and optimization of DC.

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Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Modeling of Ground Displacement Induced by Dynamic Compaction in Granular Soils

Zhang

et al. 2023

Buildings

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“…Lee and Gu [7] proposed a method to evaluate the depth and degree of infuence of dynamic compaction on sand foundation treatment. Ghassemi et al [8] established a mathematical model to analyze the efects of initial density and dynamic compaction energy level on the sand. Wang et al [9] analyzed the infuence of impact load on soil stress and deformation through a dynamic triaxial laboratory test.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Loess High Slope under Dynamic Compaction Based on Matrix Discrete Element Method

Wang

2022

Advances in Civil Engineering

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In order to investigate the safety and stability of loess high slope under dynamic ramming, the MatDem software was used to simulate the process of heavy rammer compacting the spot which was 11 m away from the toe of loess high slope. The rammer was applied with different energies of 10000 kN·m, 8000 kN·m, and 6000 kN·m. In this way, the safety and stability of slope under the action of different dynamic tamping energies can be determined. The results show that the loess high slope presented circular landslide damage by dynamic compaction. Under the same ramming times, with the decrease of ramming energy, the damage degree of loess high slope gradually reduced. According to the displacement value of different monitoring points, the large horizontal and vertical displacement points in landslide were obtained. When the ramming energy was 10000 kN·m and 8000 kN·m, the maximum horizontal displacements were 15.45 m and 10.72 m, and the maximum vertical displacements were 17.43 m and 11.91 m. When the ramming energy was 6000 kN·m, the soil at the bottom of slope would produce slight vibration. Considering the actual project, when the ramming energy was 10000 kN·m and 8000 kN·m, the minimum safe distance was recommended to be 25 m and 20 m. When the ramming energy was 6000 KN·m, the slope remained stable as a whole, and the minimum safe distance suggested should not be less than 11 m. A safety distance of collapse of loess high slope under dynamic compaction was determined, which provided a strong safety guidance for loess high slope construction under dynamic compaction.

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“…Thus, in dynamic compaction there has been a strong appreciation of numerical tools based on Finite Element methods (FEM), Finite Difference methods (MDF) and Discrete Element method (DEM) (Wang et al 2019a, b). There are works in the geotechnical literature that studied the development of craters and / or the depth of influence of the dynamic compaction technique using numerical models 1D, 2D and 3D (e.g., Lee et al 1988;Scott and Pearce 1976;Chow et al 1992;Pora ´n and Rodriguez 1992;Pan and Selby 2001;Lee and Gu 2004;Lopez-Quero ´l et al 2008;Ghassemi et al 2008;Mustafa 2010;Ghanbari and Hamidi 2015;Wang et al 2017Wang et al , 2019aDou et al 2019;Hamidi 2014;Mehdipour and Hamidi 2017;Jia et al 2018;Moon et al 2019). However, these solutions require complex and delicate models that require a large data repertoire and high processing time, which are not always available.…”

Section: Introductionmentioning

confidence: 99%