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 .
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 .
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.