The initiation of microcracking occurred along the bedding plane, and it gradually runs through the bedding plane and causes the specimen destruction, resulting in an approximately parallel layered block.
On the one hand, if the rock has many weak bedding planes and fractures, the wellbore instability is easy to happen when the weak bedding plane destructs or slides [10].
where [[lambda].sup.x.sub.eff] is the effective thermal conductivity vertical to the bedding plane direction; [[lambda].sup.y.sub.eff] and [[lambda].sup.z.sub.eff] are the effective thermal conductivities parallel to the bedding plane direction; T is the particle temperature.
Xian and Tan [8] have carried out a theoretical investigation on the layered rock masses under static loading, indicating that the bedding plane and filling materials have straightforward effects on the failure mechanism.
* [s.sub.c1] is the simple uniaxial compressive strength in the [[sigma].sub.1] direction (i.e., the direction of applied load coinciding with 01 and parallel to the bedding plane).
The core features a complete and solid Aries 2 Seam of 3.35m thickness with no structural indications other than the occasional bedding plane. This core will deliver approximately 150kg for the advance testing process.
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