| 释义 |
ˈshortwall Mining.
[f. short a. + wall n.1]
A short coalface. Freq. attrib., denoting (equipment designed for) a method of mining in which shortwalls are worked. Cf. longwall s.v. long a.1 18 a.
1912F. D. Power Coalfields & Collieries Austral. 409 Shortwall machine, a coal cutter for use in bords, which, when once the cutting part has made the sumping cut, is drawn across the face automatically by ropes, under⁓cutting as it proceeds. 1931Trans. Inst. Mining Engineers LXXXI. 474 The thin seams are extracted on a ‘shortwall’ (retreating) method. 1942Ibid. CII. 42 The shortwall is antagonistic to the basic principle that the maximum area of seam should be won with the minimum of roadway consistent with roadway costs. 1958I. C. F. Statham Coal Mining Pract. I. vii. 298 Mechanised methods are now generally adopted for the coal-cutting in these narrow opening-up places, using either a shortwall coal-cutter, a Universal coal-cutting machine or in some cases a long⁓wall machine. 1964A. Nelson Dict. Mining 406 A shortwall face may be any length between about 5 and 30 yd and is generally employed in pillar methods of working. 1973L. J. Thomas Introd. Mining vii. 258 A group of shortwalls are mined adjacent to each other with rib-pillars left between. |