In particular, it is shown there is an important interplay between the depth of the maximum compression, the stress gradient and the magnitude of the maximum compressive stress.
The derivative of Coulomb failure stress with respect to the angle between the faults and the maximum compression direction yields the required relation between frictional strength and geometry of the faults and maximum compressive stress axis as given below.
From unconfined compression testing, hydrogels containing Laponite exhibited a significant increase in both the maximum compressive stress, fracture strain, and toughness when compared to Laponite-free samples.
Prekinematic grains may also be surrounded by pressure shadows produced by minerals such as quartz that dissolve in zones of maximum compressive stress and reprecipitate in zones of lesser compressive stress adjacent to the rigid porphyroblasts.
The maximum compressive stress of surrounding rocks of the roadway is 27 MPa.
When the roadway's height-width ratio is equal to one, the maximum compressive stress in top-coal is 12 MPa.
When roadway's height-width ratio is 0.75, the maximum compressive stress in top-coal is 16 MPa.
According to Eq. 1, it could lead to a maximum compressive stress in the wet layer of 0.44 MPa.
Proposed design modification (Model 5) was able to reduce the maximum compressive stress from 76.09 MPa to 33.59 MPa.
When roadway's height-width ratio is 0.75, the maximum compressive stress in top-coal is 16 MPa, but the compressive stress concentration area increases significantly.
The maximum compressive stress near anchor bolt in the coal body is about for 0.55 MPa, the compressive stress between anchor bolts is approximately 0.25 MPa.
