Deformation of access roadways and roadside packs in coal mines

135A 844114

844118

Design of shaft fittings in Coal Measure rocks Bell, M J In: Strata Meckamics (paper to the Symposhun on Strata Mechanics, Newcastle upon Tyne, 5-7 April 1982) P160-166. Publ Amsterdam: Elsevier, 1982

Raitoul layout of roadways in floor strata sffected by longwall extraction Lu Shiliang In: Strata Mechanics (paper to the Symposium on Strata Mechanics, Newcastle upon Tyme, 5-7 April 1982) P201-206. Publ Amsterdam: Elsevier, 1982

Describes design methods adopted for modern concrete shaft linings. Although design loadings are of paramount importance, other factors such as methods of ground treatment, chemical resistance and watertightness need to be considered. 844115 Deformation of a deep shaft inset in coal measures rocks during and after construction

Analyses factors influencing the stability of roadways in floor strata: the extraction of the overlying coal seams, the mechanical properties of the surrounding rocks, the vertical distance between the roadways and the overlying seams, and the horizontal distance between the roadways and the edge of coal pillars left in overlying seams. It is concluded that properties of the surrounding rock are the most important factor.

Borsah, J K; Shelton, P D; Tomlin, N In: Strata Meekanics (paper to the Symposium on Strata

Meclumies, Newcastle upon Tyne, 5-7 April 1982) P167-173. Publ Amsterdam: Elsevier, 1982 Results obtained from vibrating wire strain gauges installed within the concrete lining of a 660m deep shaft inset are examined together with measurements of carcass deformation during initial excavation. Prior to placement of the lining, roof lowering and floor heave had occurred, although the rate of movement did decrease considerably. There are some indications that floor heave was regenerated during lining placement. The strain gauge results support the view that the lining is behaving similarly to a series of fixed-end, uniformly loaded beams subject to hoop strains which greatly enhance its stability. 844116

Smafl scale brittle model studies of mine roadway deformation Brook, N In: Strata Meckanics (paper to the Symposium on Strata Mechanics, Newcastle upon Tyne, 5-7 April 1982) P184-189. Publ Amsterdam: Elsevier, 1982 A field investigation of the roadway behaviour in the tailgate of a retreat face at Fryston Colliery, UK, is reported. The measurements of load, rock properties and deformation are compared with the behaviour of 1:150 scale models, designed according to a comparative behaviour criterion, based on tensile strength measurements. 844117

844119 Deformation of access roadways and roadside packs in coal mines Farmer, I W In: Strata Mevlmaics (paper to the Symposium on Strata Mechanics, Newcastle upon Type, 5-7 April 1982) P207-212. Publ Amsterdam: Elsevier, 1982 Observations of roadway closure, pack closure and pack stress were examined. From the results it was concluded that: (1) roadway closure has two components - initial closure related to pack closure occurring over the first 50-100m of face advance and secondary convergence caused mainly by uplift of floor clays and floor penetration, (2) pack closure can be defined in terms of pack stress, initial void ratio of pack material and pack compression index, and (3) to estimate pack closure and secondary convergence an accurate estimate of pack stress is necessary. 844120 Rdalions between closure and support in deep mine excavalions

Sbelton, P D In: Strata Mechanics (paper to the Symposium on Strata

Mechanics, Newcastle upon Tyne, 5-7 April 1982) P230-233. Publ Amsterdam: Elsevier, 1982 The mechanics of rock deformation around underground openings in Coal Measures rocks are discussed with reference to yield zone solutions and the brittle-ductile behaviour of seatearths and sheared mudstones. The possible use of the New Austrian Tunnelling Method for support is considered.

Retreat working using an anhydrite packed gateroad twice

Mallory, R In: Strata Meckanics (paper to the Symposium on Strata Meclumles, Newcastle upon Tyne, 5-7 April 1982) P196-200. Publ Amsterdam: Elsevier, 1982 An investigation was undertaken in the anhydrite packed maingate of T24's advancing face in the Trencherbone Seam at Parkside Colliery, UK. The roadway was used a second time as the tailgate for the adjacent T25's retreating face. The results indicate that: (1) the system of packing and roadway support achieved a stable roadway capable of being used a second time, and (2) during the advancing phase, the load in the anhydrite pack yielded when it reached 4MPa. It also reduced as the retreating face approached. In both cases it is probable that the fireclay floor yielded. However, when the floor was restrained pack load exceeded 12MPa.

844121 Size and shape effect in pillar design Tsur-Lavie, Y; Denekamp, S A In: Strata Meclumles (paper to the Symposium on Strata Mechanics, Newcastle upon Tyne, 5-7 April 1982) P245-248. Publ Amsterdam: Elsevier, 1982 Size and shape effect in pillars is approached theoretically using energy considerations. Size effect is quantitatively expressed by a relation between load at failure and cross sectional area. Energy considerations are also found to provide a partial explanation for shape effect. Empirical pillar strength formulae point to a definite relationship between size effect and shape effect. This relationship is explained by theoretical considerations linking both size and shape effect to fundamental material properties of the rock. 844122 Design of high extraction panels in a deep potash mine Cook, R F In: Strata Meeimmcs (paper to the SympoMJm on Strata Mechanics, Newcastle upon Tyne, 5-7 April 1982) 1'249-253. Publ Amsterdam: Elsevier, 1982