Study of Rock Blasting Failure Pattern with One Free Boundary
Table 1
Mineral features according to polarizing microscope images.
Minerals
Features
Potassium feldspar (Kfs)
It is semi‐idiomorphic, columnar, and argillaceous; it mainly consists of a strip of orthoclase and a stripe of feldspar; and it has a two-long structure with potassium feldspar.
Plagioclase (Pl)
It is semi‐idiomorphic, columnar, and polycrystalline and undergo sericitization and zoisite fossilization; it has a two-long structure with plagioclase.
Quartz (Qtz)
It is xenomorphic-granular. The main grain size is 2–5 mm; some grain size is 0.5–2 mm, and the content is about 20%.
Biotite (Bt)
It is idiomorphic schistose, brown, chloritization in varying degrees; it shows metasomatic residual or pseudomorphic structure. The main grain size is 0.2–2 mm, and the content is about 7%.
Amphibole (Hbl)
It is semi-idiomorphic and columnar. The main grain size is 0.5–2 mm, and the content is about 2%.
Others
The auxiliary minerals are magnetite, zircon (Zrn), and apatite (Spn). The altered minerals are sericite, tetrahedrite, and chlorite.