In addition, according to the effect of the single joint angle on the strength of the single-crack rock specimen, when fi satisfies the following (5), sliding failure along the
joint plane direction occurs in the single-crack rock, and the corresponding strength is the lowest [31].
performed the conventional triaxial compression tests on the marble specimens containing natural joints, and the effects of joint angle (between the
joint plane and major principal stress) varying from 29.3[degrees] to 56.0[degrees] on the strength and failure model were studied [4].
In this model, after the
joint plane is defined, a smooth joint (SJ) is assigned to the contacts between the particles.
FLY ON WALL Rivet
Joint plane could be sent over North Korea
The smooth joint can be envisioned as a set of elastic springs uniformly distributed over a circular cross-section, centered at the contact point and oriented parallel with the
joint plane. Once the SJ model is created, preexisting parallel bonds would be deleted and replaced with SJ model.
Figure-5 clearly fulfills the Hocking's refinement where: a1 = Trend of the line of intersection a2 =Dip direction of
joint plane 2 af=Dip direction of slope face
In accordance with the methodology of the quantitative description of discontinuities in rock mass (ISRM, 1983), the interval between joints of each system, persistence of joint, roughness of
joint plane, joint separation, minerals filling and the amount of the potential inflow intensity of water were monitored.
The principal values of permeability in maximum and minimum in a rock sample with
joint plane angle being 15[degrees] are listed in Table 2.
* Hydraulic continuity problems--If persistent and open discontinuities intersect the proposed bore path, then the possibility of a "frac-out" along a discrete
joint plane cannot be ruled-out.
IR preheating of the
joint plane almost eliminates particulates, and active braking of the vibration head increases weld strength significantly, claims Branson.
After the fracture propagates along the joint and overlaps the
joint plane, it propagates along these overlapped joints.