Digital image based numerical micromechanics of geocomposites with application to chemical grouting

Mechanical Properties and Consolidation Performances of High-Polymer Material in Coal

“…The detailed stratigraphic column and the layout plan of the roadway are shown in Figure 2. The eight coal layer of this mine is at the bottom of the third sub-segment in Section 5 of the Xujiahe formation of the upper Triassic (T 3 xj ); this coal seam is the primary mineable coal bed of the Tangjiahe coal mine, and it has a thickness of 1. with chemical materials [14,15]. Despite extensive research into violent failure in coal seams, little progress has been made in improving our understanding or towards control measures.…”

“…Owing to this good performance, high-polymer material grouting should be applied more widely in geotechnical engineering. Domestic and overseas scholars have studied the mechanical properties of rocks that are consolidated with 2 of 18 chemical materials [14,15]. Despite extensive research into violent failure in coal seams, little progress has been made in improving our understanding or towards control measures.…”

Parallel solution of elasticity problems using overlapping aggregations

“…The orthogonality of searched directions was restored with respect to last 3 directions. (a) The first model (see Figure 5(a)) corresponds to the laboratory uniaxial test on a geocomposite (see [6]). The constant nonzero normal displacements are prescribed on the upper side of the cube, the zero normal displacements are prescribed on the bottom side of the cube.…”

High Performance Computing Applications

“…The Neumann BC enter opposite non-zero forces on the top and bottom sides in the direction of uniaxial loading, the other sides have zero normal forces. The use of pure Dirichlet and pure Neumann BC allow us to get upper and lower bounds for the upscaled elasticity tensor, see, e.g., [4]. Due to irregular placement of steel fibers as well as voids in the microstructure, the results document anisotropy of tested material, when the values of material properties strongly vary for different directions of loading, e.g., the Young's modulus E (Sample 4, Neumann BC) in Table 3 varies about more than 1 GPa.…”

“…This inverse problem exploits the objective function (the cost functional) ( ), = ( ; ), 1 = 2 = 1, introduced in Section 2. For more details, see [4]. Optimization is performed by the non-gradient Nelder-Mead (NM) method with starting values ( , ) provided by three pairs (17.000, 0.26), (21.000, 0.17), (18.000, 0.23).…”