... past experience and to avoid similar instabilities in the future. INTRODUCTION Highwall mining is a remotely controlled mining method which extracts coal from the base of an exposed highwall, typically via a series of parallel entries driven to a significant depth within the seam horizon...

... ABSTRACT: Since the middle of 1980Õs, the longwall top-coal caving technique has developed rapidly in China. At present, it is one of the main approaches in the thick coal seam mining. This paper describes some mechanics problems of the caving technique, such as the damage and failure...

... measures aiming to lower acting stress and ability of surrounding rock to accumulate strain energy in shape of elastic energy. This involves irrigation of compact rock over the block to be mined, large-extent blasting operations in this rock, irrigation of coal seam throughout the mining area, etc...

..., which will increase to about 190m over the next 10 years. structural geology depressurisation Reservoir Characterization coal Upstream Oil & Gas seam stability movement adjacent ground movement operation aquifer depressurisation batter stability Australia Latrobe Valley batter...

... metals & mining coal pillar extraction maingate reservoir geomechanics pillar failure site seam lower seam pillar lower seam pillar visual observation Reservoir Characterization pillar failure seam pillar tailgate Sigma Colliery pillar panel bord bottom seam pillar...

... INTRODUCTION Economically significant Permian coal Seams have been formed in different Portions of the Sydney Basin, New South Wales, a linear molasse trough situated between a cratonized foreland (Lachlan Fold Belt) to the west and a mobile hinterland (New England Fold Belt) to the northeast...

... coalfield roof rock seam roof shale Upstream Oil & Gas colliery seam metals & mining Thickness taltore seam roof Reservoir Characterization strength roof shale sandstone shale roof India plane raghunathbati seam roof fall seam roof shale specimen jamuria 7...

... of coal, the excavation of coal seams with faults under bottom of sea, etc. For analyzing such problems by computer, we assume an elastic-collapse model with artificial plasticity and applied Prof. kawai's Rigid Body Spring Model (RBSM) (kawai 1980). In the RBSM coal seams or rock strata are considered...

... labile sandstones. The sandstones occur as thin beds within siltstones or more persistent bands up to 1 m thick. Up to three coal seams are developed in the present open pit areas. The upper seam (Aries or A Seam) is of increasing economic importance down-dip but only remnants occur in the areas...

...Proceedings of the International Symposium on Weak Rock / Tokyo /21-24 September 1981 Relaxation and creep properties of thin interbedded clayey seams and their fundamental role in the stability of dams TAN TJONG KIE Academia Sinica, Beijing, China LI KE RI Academia Sinica, Wuhan, China SUMMARY...

... ROOF FALL IN INCLINED COAL SEAM IN NOWA RUDA COAL MINE HSMEHEHHE ~HSHKo-MEXAHMqECKHX' CBO~CTB IECTKHX nECtrAHHKOB H KOH- r~OMEPATOB BCnEAc~~ HArHETAHHRBOAH B KPOB~D ~~R TOrO, qrOBY C,l1EJJATh BOSMOJRHOvtPASPABOTKY C OBPYDlEmJEJI H A1lR CmnKEffH.R OnACH era OCE,l1AIDUI nOPOA KPOBJIH B HAKJIOHHHX YrO...

... and maintenance of the longwall workings. metals & mining load-bearing capaoity face support operation diagram whioh immediate roof strata cohesive roof strata model test seam root strata rock mass Prop construction longwall face roof strata solid coal strata functional relationship...