Exact(12)
Varying the thermal conductivity of the backfilling material changed the borehole thermal resistance by up to 41% (Figure 2c).
Finally, we perform a parametric study on a ground heat exchanger with single U-shaped tube, by which the spacing between U-tube legs, the length-to-radius ratio of borehole, the ratios of thermal diffusivities and conductivities of the ground and backfilling material are analyzed.
The results show that: (i) The covering-rock mechanics of the overly strata comes from "two-arch structures + hinged girder + bend beam" to "backfilling material + hinged girder + bent beam" by increasing the fill ratio from 0%to85%5%, the beginning of overlying strata movement appears later and the total duration of subsidence velocity increased from zero to the highest value increases.
In such a case, we have to consider the use of wider pillar, narrow opening and stronger backfilling material.
For example, these guidelines require proof of suitability of the backfilling material used by an accredited institution.
Compacted crushed stone was used as a backfilling material between the piles, and the steel mesh was used to tie the components of the mechanically stabilized (MSE) wall.
Similar(48)
This paper presents the theoretical design for a practical HGSHP experimental system considering the borehole distance, borehole depth, and backfilled material.
The mechanical properties and parameters of two different backfilling materials were simulated and listed in Table 2.
This research indicates that traditional considered waste materials can be reused viably as alternate pipe backfilling materials.
Also shear strength properties were found to be equivalent or superior to those of typical quarry backfilling materials.
Waste rocks have been used in the world for many years as backfilling materials to provide additional support to underground excavations in mines.
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