Coulomb Strength

In Manning model, the slope off versus the Coulomb strength or the linear charge density parameter lB lB/l is discontinuous at 1 [31,48], This is a consequence of the fact, that for all less than or equal to unity, / is linear function of 1/s and saturates at unity [31, 35, 48]. The present model indicates a sigmoidal variation off with 1/e and saturates as /H > 0 [48],... 

As in literature [8], Mohr-coulomb strength conditions considering temperature effects can be expressed as follow. 

According to the Mohr—Coulomb strength conditions and salt rock shear strength thermal damage, thermal damage factor as (3). 

As we know, the ability of deformation resistance and strength of rock-mass will be improved due to the increases of lateral compressive stress. This is described by Hooke s law and Coulomb strength model ... 

The term cohesion is perhaps one of the most ill-used and vague terms in our discipline. In one sense, it is used to describe a coherency in the consistency of a soil sample the particles hanging together as a unit. In the context of shear strength, it becomes nebulous as it can mean either the undrained shear strength (c = Cu or Su) or the effective cohesion intercept (c ), a parameter from the well-known linear Mohr-Coulomb strength criterion. The dilemma is depicted in Figure 4 which shows both of these cohesions within a q-p space. 

The elastic-plastic constitutive model for triaxial simulations is introduced to illustrate the Mohr-Coulomb strength criterion and dilatancy. Figure 11 shows the soil model for the simulation of a displaeement-controlled drained triaxial test, where total stresses from the previous isotropic compression are taken as initial conditions. A vertical displacement... 

We shall call E as the charge density parameter or Coulomb strength parameter interchangeably. The electric potential follows from Equations 3.78 and 3.79 as... 

Effect of Coulomb Strength on Degree of Ionization and Size 6.3.2.1 Salt-Free Solutions... 

We further notice that the salt concentration, c 2, at which the polymer collapses, decreases with increasing Coulomb strength (Figure 6.24a and b) further confirming that the first-order collapse induced by the ion-bridging by divalent (or multivalent) cations is an electrostatic phenomenon. In addition. Figure 6.24c shows that c 2 varies approximately inversely with both forms of the Coulomb strength, Ib and 6. We find Ibc 2 — 0.0006 (for 8 = 2.5) and 8c 2 Ci 0.0005 (for k = 3.0). 

Figure 6.24 Effect of Coulomb strength on bridging collapse the salt concentration at which the first-order collapse occurs, as functions of Iq (a), and 6 (b). In (a), Iq — 3.0. In (b), 6 = 2.5. All other parameters are the same...

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