In-Situ Stress Measurement in Raniganj Coalfield and Its Applications in Mine Stability Analysis
- 79 Downloads
The in situ stresses have significant effects on the stability of openings, support requirements, parting stability, pillar strength, etc. In order to analyze the stability of underground structures, the measurement of magnitude and direction of horizontal stress is necessary in addition to knowing other geomining parameters and rock properties. In this direction, this paper presents a systematic determination of in situ stresses in three mines of the southern Raniganj coalfield of India, using single sleeve fracturing technique. Based on the analysis of field test results, the gradients of major, minor and average horizontal stresses are established for the southern Raniganj coalfield. The determined in situ stress values are used in numerical modeling for stability evaluation of known case histories of parting between contiguous seams and pillars of this coalfield. The numerical modeling results analyzed in this paper validated that the in situ stresses determined in the Raniganj coalfield are acceptable for the stability analysis of coal pillars, parting and underground roadways.
KeywordsIn-situ stress measurement Sleeve fracturing technique Horizontal stress Parting stability analysis Numerical modeling
The authors would like to thank the Director, CSIR-CIMFR, for permitting to publish this paper. The authors are immensely thankful to our former colleagues, Dr. A. K. Sinha, Mr. A. K. Ghosh, Dr. Mohan Prasad, Mr. D. G. Rao and Mr. Pramod Kumar who provided insight and expertise during the execution of this research works.
This work was supported by Coal Science and Technology grant of the Ministry of Coal, Government of India.
- 6.Clark JB (1949) A hydraulic process for increasing the productivity of wells. Petrol Trans Am Inst Min Eng TP 2510(186):1–8Google Scholar
- 7.Hubbert KM, Willis DG (1957) Mechanics of hydraulic fracturing Petrol. Trans Am Inst Min Eng 210:153–166Google Scholar
- 8.Fairhust C (1964) Measurement of in situ rock stresses with particular reference to hydraulic fracturing. Rock Mech Eng Geol 2:129–147Google Scholar
- 9.Hooker VE, Bickel DL (1974) Overcoring equipment and techniques used in rock stress determination. USBR IC-8618Google Scholar
- 10.Bhola KL (1968) Geology of Narwapahar uranium deposit. Prague, Czech Republic, Int Geol CongGoogle Scholar
- 11.Bhola KL (1968) Geology of Narwapahar uranium deposit. In: International geology congress, Prague, Czech RepublicGoogle Scholar
- 12.John LP (2000) Three dimensional numerical modelling of machine hall and transformer hall caverns at Ghatghar pumped storage scheme. CMRI reportGoogle Scholar
- 13.Sheorey PR (1997) Empirical failure criteria. A.A. Balkema, RotterdemGoogle Scholar
- 14.Prasad M, Sinha A, Prasad L (2001) Design of pillars in hard rock mines by numerical simulation techniques. In: Proceedings of the 3rd Indian conference on computer applications in mineral industry (ICCAMI), New Delhi, India, 301–314Google Scholar
- 15.Sharma P (1997) In-situ stress measurement and its application in mining–case studies of Indian mines. In: Obaraeds Y, Sugawara K (eds) Rock stress. A.A. Balkema, RotterdemGoogle Scholar
- 17.Anireddy HR, Ghose AK, Kejriwal BK (1994) Estimation of in situ horizontal stresses in Indian coal basins. Minetech 15(2):5–16Google Scholar
- 24.Stephansson O (1983) Rock stress measurement by sleeve fracturing. In: Proceedings of the 5th Congress IntSoc Rock Mech, Melbourne, Austrailia. Rotterdam: AA Balkema, F129-37Google Scholar
- 26.Stress/Property measurement system S-350 (1997) Users’ Manual, Serata Geomechanics Inc., Richmond, California-94806, USAGoogle Scholar
- 27.Goodman RE (1980) Introduction to rock mechanics. Wiley, New York, pp 107–109Google Scholar