- Email: [email protected]
Some direct and inverse problems in land subsidence theory
EXCAVATIONSSUBSIDENCE 967337 Restoration of the Ackton opencast coal site, West Yorkshire ANON, Coal Znternational, 244(2), 1996, pp 73-74. This short article describes the restoration of a site which was scarred by spoil heaps from underground mining and from subsequent opencast mining operations. The reinstatement of the site resulted in a prestigious environmental award for Miller Mining. (Author) 967338 Restoration of a coal-mine overburden dump - a case study R. S. Singh, S. K. Chaulya, B. K. Tewary & B. B. Dhar, Coal International, 244(2), 1996, p 80. For the restoration of a coal-mine overburden dump, five tree species viz Dalbergia sisoo, Azadirachta indica, Albizia procera, Delonix regia and Acacia nilotica were seeded to evaluate their germination and growth performance. Dalbergiu sisoo was found to be the best early successional leguminous plant species showing maximum increase in shoot length and diameter on the mine dump. Therfore, it is recommended that the findings of this study be implemented on mass scale in the dry tropics of India. (Authors) 967339 Subsidence land reclamation by use of a hydraulic dredge pump in Chinese coal mines Z. Hu, Mining Technology, 78(895), 1996, pp 79-81. The technique of reclaiming disturbed land by use of a hydraulic dredge pump (HDP) (which is a set of hydraulic machines for earthwork), termed ‘digging deep to fill shallow’, has been used in the reclamation of subsidence areas in Chinese coal mines. This paper discusses the operational principal of the technique and summarises its reclamation procedures, which are being used in current reclamation practice. (from Author)
Subsidence,
caving and rockbursts
331A
mechanical non-equilibrium state as a result of receiving and dissipating mechanical energy. The natural system is identilied as a viscous-elastic medium, for which is inherent the phenomenon of creeep. The influence of the temperature field on the stress-strain state of the rock mass is also taken into account. The thermodynamic criterion for assessing the land subsidence state is the entropy variation. (Authors) 967342
Simulation of subsidence in soil layers in a ~eotecb~ica~ centrifuge H. G. B. Allersma, in: Land subsidence. Proc. ~~ternat~ona~ symposium, The Hague, 1995, ed F.B.J. rends & others, (IAHS; Publication, 234), 1995, pp 1I7-I Tests were performed in the small ge~techni~~ centrifuge at the University of Delft in order to examine the behaviour of soil layers that are subjected to a large localized settlement at a large depth. Uniform soil layers as well as soil with a clay layer and a layer of rocky material we clearly show the interaction between the (Author) 967343 Historique de I’incident d’Okn 32, Sahara Algerien (History of the Okn-32 incident in t ~t~e~~ part 5f the Algerian Sahara) S. Akretche & L. Okbi, in: Land subsidence. Proc. international symposium, The Hague, 1995, ed F.B.J. Barends & others, (IAHS; Publication, 234), 1995, pp 107-116. On 26 October 1986 a land subsidence incident occurred at Haoud Berkaoui Oil Field in the northern part of the Algerian Sahara. which swallowed un the Gkn-32 oil well and the core drill-2. The resulting crater kas 80 m dee in diameter. Six months later after subsequent subsidence events destroyed Okn-32 bis situated 80 m from Okn-32, the crater was 320 m in diameter. The origin of this event is discussed. (English summary) 967344
967340 Some direct and inverse problems in land subsidence theory V. Dimova, in: Land subsidence. Proc. international symposium, The ZZague, 1995, ed F.B.J. Barends & others, (IAHS; Publication, 234) 1995, pp 269-275. Two problems are considered and solved in this paper. 1) Direct problem - the mining system is given; determine the equation of the land subsidence. This problem is reduced to the Dirichlet problem for Fourier’s equation, 2) Inverse problem - the equation of the mining subsidence is given, determine the underground operations from which the given subsidence is realized. This problem is of extreme importance in the cases when mining has to be done under built-up areas. In these cases the building standards dictate the land subsidence equation. This necessitates a more rigorous formulation of a new inverse problem in the land subsidence theory. The problem is reduced to an inverse Dirichlet problem for Fourier’s equation. This is an incorrectly posed problem of mathematical physics in the sense of Hadamard. Its solution is obtained by Lions’ quasi-inversion method. Some generalizations of the posed problems are discussed. (from Author)
Subsidence due to coal mining in In R. P. Sinah & R. N. Yadav. in: Land subsidence. Proc. international symposium, The Hague, 6995, ed F.B.J. Barends & others, (IAHS; Publication, 234), 1995, pp 207214. Subsidence is very prevalent in the niganj coal field which is a major coal producing area. The occur~~~ee of thick coal seam at shallow depth is the main reason for the subsidence and as a result collapses have occurred in many coal mines in recent years. In the present paper, a review of coal mining subsidence in India will be presented, Computed subsidence profiles of Ratibati and Shivadanga coal mines of the Raniganj coal field have been compared. The results show a reasonable match of the predicted and observed subsidence in the case of the Ratibati coal mine. In %be case of the Shivadanga coal mine the predi found to be larger than the obse bottom of the observed troughs is found to match with the predicted troughs. Detailed analyses have bee investigate the effect of mine parameters on t (from Authors) 967345 Subsidence of underground quarries Y. Yokoyama, K. Uena & T.
967341 Entropy approach - an alternative for effective prediction of land subsidence from mining G. Andreev & D. Gabeva, in: Land R. Halatchev,
subsidence. Proc. international symposium, The Hague, 1995, ed F.B.J. Barends & others, (IAHS; Publication,
234), 1995, pp 305-312. A new approach for thermodynamic modelling of the rock mass is developed, which is intended for predicting the land subsidence due to underground mining activity. It is based on the postulates of Non-Equilibrium Thermodynamics and the rock mass is treated as a dissipative system being in a
234), 1995, pp 225236. A collapse of an underground Ohya quarry in Ohya district, a northern part of Kanto area in Japan, caused a large scale subsidence about 3300 m2 wide. S~bsequeu% large scale subsidence has occurred in the same district, The authors investigated strength characteristics of Ohya stone, especially strength deterioration and creep characteristics” The specimens used in this study were strictly maintained in %heir
subsidence. Proc. international symposium, The Hague, Z995, ed F.B.I. Barends & others, (IAHS; Publication,
hya district, Japan unuma, in: Land
Subsidence,
caving and rockbursts
331A
mechanical non-equilibrium state as a result of receiving and dissipating mechanical energy. The natural system is identilied as a viscous-elastic medium, for which is inherent the phenomenon of creeep. The influence of the temperature field on the stress-strain state of the rock mass is also taken into account. The thermodynamic criterion for assessing the land subsidence state is the entropy variation. (Authors) 967342
Simulation of subsidence in soil layers in a ~eotecb~ica~ centrifuge H. G. B. Allersma, in: Land subsidence. Proc. ~~ternat~ona~ symposium, The Hague, 1995, ed F.B.J. rends & others, (IAHS; Publication, 234), 1995, pp 1I7-I Tests were performed in the small ge~techni~~ centrifuge at the University of Delft in order to examine the behaviour of soil layers that are subjected to a large localized settlement at a large depth. Uniform soil layers as well as soil with a clay layer and a layer of rocky material we clearly show the interaction between the (Author) 967343 Historique de I’incident d’Okn 32, Sahara Algerien (History of the Okn-32 incident in t ~t~e~~ part 5f the Algerian Sahara) S. Akretche & L. Okbi, in: Land subsidence. Proc. international symposium, The Hague, 1995, ed F.B.J. Barends & others, (IAHS; Publication, 234), 1995, pp 107-116. On 26 October 1986 a land subsidence incident occurred at Haoud Berkaoui Oil Field in the northern part of the Algerian Sahara. which swallowed un the Gkn-32 oil well and the core drill-2. The resulting crater kas 80 m dee in diameter. Six months later after subsequent subsidence events destroyed Okn-32 bis situated 80 m from Okn-32, the crater was 320 m in diameter. The origin of this event is discussed. (English summary) 967344
967340 Some direct and inverse problems in land subsidence theory V. Dimova, in: Land subsidence. Proc. international symposium, The ZZague, 1995, ed F.B.J. Barends & others, (IAHS; Publication, 234) 1995, pp 269-275. Two problems are considered and solved in this paper. 1) Direct problem - the mining system is given; determine the equation of the land subsidence. This problem is reduced to the Dirichlet problem for Fourier’s equation, 2) Inverse problem - the equation of the mining subsidence is given, determine the underground operations from which the given subsidence is realized. This problem is of extreme importance in the cases when mining has to be done under built-up areas. In these cases the building standards dictate the land subsidence equation. This necessitates a more rigorous formulation of a new inverse problem in the land subsidence theory. The problem is reduced to an inverse Dirichlet problem for Fourier’s equation. This is an incorrectly posed problem of mathematical physics in the sense of Hadamard. Its solution is obtained by Lions’ quasi-inversion method. Some generalizations of the posed problems are discussed. (from Author)
Subsidence due to coal mining in In R. P. Sinah & R. N. Yadav. in: Land subsidence. Proc. international symposium, The Hague, 6995, ed F.B.J. Barends & others, (IAHS; Publication, 234), 1995, pp 207214. Subsidence is very prevalent in the niganj coal field which is a major coal producing area. The occur~~~ee of thick coal seam at shallow depth is the main reason for the subsidence and as a result collapses have occurred in many coal mines in recent years. In the present paper, a review of coal mining subsidence in India will be presented, Computed subsidence profiles of Ratibati and Shivadanga coal mines of the Raniganj coal field have been compared. The results show a reasonable match of the predicted and observed subsidence in the case of the Ratibati coal mine. In %be case of the Shivadanga coal mine the predi found to be larger than the obse bottom of the observed troughs is found to match with the predicted troughs. Detailed analyses have bee investigate the effect of mine parameters on t (from Authors) 967345 Subsidence of underground quarries Y. Yokoyama, K. Uena & T.
967341 Entropy approach - an alternative for effective prediction of land subsidence from mining G. Andreev & D. Gabeva, in: Land R. Halatchev,
subsidence. Proc. international symposium, The Hague, 1995, ed F.B.J. Barends & others, (IAHS; Publication,
234), 1995, pp 305-312. A new approach for thermodynamic modelling of the rock mass is developed, which is intended for predicting the land subsidence due to underground mining activity. It is based on the postulates of Non-Equilibrium Thermodynamics and the rock mass is treated as a dissipative system being in a
234), 1995, pp 225236. A collapse of an underground Ohya quarry in Ohya district, a northern part of Kanto area in Japan, caused a large scale subsidence about 3300 m2 wide. S~bsequeu% large scale subsidence has occurred in the same district, The authors investigated strength characteristics of Ohya stone, especially strength deterioration and creep characteristics” The specimens used in this study were strictly maintained in %heir
subsidence. Proc. international symposium, The Hague, Z995, ed F.B.I. Barends & others, (IAHS; Publication,
hya district, Japan unuma, in: Land