However, these earlier exposures would mean that the pore water pressures in the stope may not have fully dissipated, hence entering an effective stress state versus a total stress state. The goal of this paper was to examine how effective stress impacts these early exposures. This was done by...
While Terzaghi justified his principle of effective stress for water-saturated soil empirically, it can be derived by means of the neutrality of the mineral with respect to changes of the pore water pressure pw. This principle works also with dilating shear bands arising beyond critical points of...
2.2.1 Effective stress concept in poroplasticity As shown above, the plastic yield function and potential are both functions of two independent forces, the total stress and interstitial pressure. The determination of such functions requires laboratory tests involving complex loading paths in the space ...
4. c Scaling relation between the shear stress drop versus average slip rate obtained using the average stress profile recorded by strain gages (grey circles) or pressure sensors (white circles). Full size image Fig. 4: Propagation of rupture along the interface during slip events. The rupture...
The effects of effective stress and temperature on the permeability of the reservoir rock over a long time, associated with many theoretical studies, have been reported. For example, Ran and Li (1997) suggested that the rock total volume is composed of the matrix volume and the pore volume. ...
Strength evolution versus confining stress based on Eq. (4) for different porosities of hydrate-free sediments Full size image The strength increases nonlinearly near an effective confining pressure ofσc' = 3 MPa. Dense sand has a large peak friction angle at low-confining pressure, decreas...
Patellar resurfacing versus nonresurfacing in total knee arthroplasty: a meta-analysis of randomised controlled trials. Int Orthop. 2013;37(6):1075–83 [cited 2018 Nov 15]. Available from: http://www.ncbi.nlm.nih.gov/pubmed/23529719. 7. He JY, Jiang LS, Dai LY. Is patellar resurfacing ...
The PPM is derived from the number of weeping holes and slots required per unit assembly versus the actual number of deficiencies overall observed for the same number of units. Call center: This is a daily operational occurrence but increases in call complexity related to changes in the ...
How to measure:Compare the costs of test automation tools and maintenance with the benefits, such as time saved and improved quality. Definition:The return on investment for test automation efforts. Why it matters:Assesses the value derived from automating test cases versus the cost....
It states that the effect of the total stress σ and the pore pressure Pp can be described using a single parameter, which is known as the effective stress σ′, and is defined as follows:(1)σ′=σ−Pp. In general, Terzarghi׳s effective stress is not always valid for fluid-...