厚煤层一次采全高沿空掘巷围岩变形机理及控制研究.pdf

万方数据 20159 20184 20185 20186 万方数据 STUDY ON DEATION MECHANISM AND CONTROL OF ROADWAY DRIVING ALONG NEXT GOAF FULL SEAM MINING IN THICK COAL SEAM A Dissertation ted in fulfillment of the requirements of the degree of MASTER OF ENGINEERING from Shandong University of Science and Technology by Deng Lei Supervisor Professor Yang Yongjie College of Mining and Safety Engineering June 2018 万方数据 万方数据 万方数据 万方数据 I 5m 46 1008 万方数据 II Abstract In this paper, we take roadway driving along next goaf full seam mining of thick coal seam in the Fucun Coal Mine as the research object. By theoretical analysis, field test and numerical simulation, the failure characteristics of surrounding rock in roadway driving along goaf with full height mining at thick coal seam are studied. On the basis of this, the optimization scheme of bolt support suitable for mining full height along goaf in thick coal seam is determined and applied to field practice to achieve efficient and the efficient and safe coal recovery having been realized. Through field measurement, the distribution rule, peak position and low stress range of the abutment pressure of fully mechanized coal face are obtained. On this basis, through the comparison and analysis of the stress numerical simulation of the surrounding rock of different coal pillar sizes, the rational retention width of the small coal pillar in the gob roadway is determined to be 5m. In order to avoid the significant influence of the violent movement of the basic top and alleviate the abnormal tension between mining and driving, through the measurement and analysis of surrounding rock deation of the gob side entry roadway in the thick coal seam of the Fucun Coal Mine.The time of roadway driving along the goaf should not be less than 46 days. With the numerical simulation , the influence of different factors such as the depth of coal seam, the size of the section and the thickness of coal seam on the distribution of surrounding rock and displacement is analyzed, and the influence of different factors on the deation and failure characteristics of the surrounding rock is further explored. Through the field measurement, the influence range of the advance support pressure caused by the working face recovery is determined, and the deation and failure characteristics of the surrounding rock of the thick coal seam with full height along the goaf are clarified, mainly including the relatively broken surrounding rock, the poor integrity and integrity of the roadway surrounding rock, and the low stiffness of the rock mass within the anchorage range.The main reasons for the deation and failure of the surrounding rock are revealed, such as the complex stress 万方数据 III environment in the roadway surrounding rock, the unreasonable selection of roadway support parameters, the unreasonable selection of the bolt supporting component and the large size of the tunnel section. In view of the deation and failure characteristics of the surrounding rock of full high seam roadway excavated in thick coal seam and the actual situation of Fucun Coal Mine, the Countermeasures of surrounding rock control are put forward, which are “improve anchor pre tightening force high strength steel belt strengthen weak position“, and applied to the production practice of 1008 working face along goaf. The field application results show that the deation of the roadway surrounding rock is greatly reduced after the optimization scheme, the control effect of the roadway surrounding rock meets the normal production requirements of the working face, and effectively solves the problem of the difficulty of supporting the thick coal seam with the full height along the empty roadway in the coal mine of Fucun Coal Mine.The research results in this paper have a good reference and promotion value for bolt support in gob side entry under similar conditions. Keywords extra-thick coal seam, roadway driving along next goaf, deation of surrounding rock, destruction characteristics, control strategy 万方数据 IV .....................................................................................................1 ...................................................................................... 1 .................................................................................................. 3 .................................................................................................. 8 .............................................................................................11 .............................................................................................................11 ........................................................................................................ 12 ........................15 .................................................................................... 15 .................................................................................... 24 ............................................................................................................ 26 ............27 .................................................................................................... 27 ............................................ 28 ............................................ 35 ............................................................................................................ 40 ............................41 ........................................ 41 ............................................ 51 ............................ 54 ............................................................................................................ 56 .............................................................................................58 ............................................................................................................ 58 .................................................................................................... 58 ............................................................................................................ 61 万方数据 V .........................................................................................63 ............................................................................................................ 63 .................................................................................................................... 64 .................................................................................................65 .....................................................................................................69 .....................................................................70 万方数据 VI Contents 1 Introduction............................................................................................................. 1 1.1 The proposal and research significance of the subject...............................................................1 1.2 Research status at home and abroad..........................................................................................3 1.3 Research contents and s.................................................................................................8 2 Engineering survey................................................................................................11 2.1 General situation of mine ........................................................................................................11 2.2 General situation of working face............................................................................................12 3 Research on reasonable roadway location and time for fully mechanized gob side entry driving in thick seam.......................................................................... 15 3.1 Research on the position of roadway driving along goaf ........................................................15 3.2 Study on the time of roadway driving along goaf ...................................................................24 3.3 Brief summary.........................................................................................................................26 4 Numerical study on deation and failure characteristics of surrounding rock in a fully mechanized gob side entry roadway with thick seam.............. 27 4.1 Numerical simulation scheme .................................................................................................27 4.2 Stress distribution rule of surrounding rock in roadway driving with full height and gob side entry in thick seam...................................................................................................................28 4.3 Displacement distribution rule of surrounding rock in roadway driving along goaf with full height mining at thick seam.....................................................................................................35 4.4 Brief summary.........................................................................................................................40 5 Control strategy for roadway with surrounding rock at once and full height along thick coal seam ........................................................................................... 41 5.1 Measurement and analysis of original support scheme for thick coal seam with full height and gob side entry driving..............................................................................................................41 5.2 Optimization of bolt support parameters for gob side entry mining with thick seam and full height mining...........................................................................................................................51 5.3 Numerical simulation analysis of surrounding rock control effect of original support scheme and optimized support scheme ................................................................................................54 5.4 Brief summary.........................................................................................................................56 万方数据 VII 6 Engineering application ....................................................................................... 58 6.1 Monitoring scheme..................................................................................................................58 6.2 Analysis of monitoring results.................................................................................................58 6.3 Brief summary.........................................................................................................................61 7 Conclusion and prospect ...................................................................................... 63 7.1 Reference.................................................................................................................................63 7.2 Expectation..............................................................................................................................64 Reference .................................................................................................................. 65 Thanks....................................................................................................................... 69 .................................................. 70 万方数据 1 45 10158.0m 万方数据 2 33 10075.5m 10074.4m4.2m 18.48m2 33 万方数据 3 [1-5] [6-16] [17-19] OS C4 [20-24] 万方数据 4 [25] [26] [27] [28] 万方数据 5 [29] UDEC [30] [31] FLAC3D 万方数据 6 [32] [33] [34-37] [38-40] 万方数据 7 Louis A. Panek20 [41] [42][43-52] [53-60] 1 195660 10 2 3 万方数据 8 1 10071008 2 3 4 5 万方数据 9 1.1 1.1 Fig.1.1 Technology route of research 1 万方数据 10 2 3 FLAC3D 万方数据 11 1 27Mt/a 16km19km 2.1 2.1 Fig.2.1 Traffic position diagram 万方数据 12 2 307m 3 1007 724m175m5.5m597 -455.3m-540.0m 31007 100810011001 1008 35.355.77m5.50m0.4 1.0f1.52.23 2.23 1 310072371 11316171193-490.33m -530.50m3 万方数据 13 2.2 3 Fig.2.2 Integrated histogram of roof and floor of 3 coal seam 2 3 4200mm4400mm3800mm 900800mm900800mm-50 50mm14002400mm 1040mm50m50m8 2.3 万方数据 14 2.3 Fig.2.3 Staircase support map of timber Lane anchor net 万方数据 15 100m2 3.1 Fig.3.1 A schematic diagram of the layout of a borehole stress meter 万方数据 16 220m2 6m3.1 13 2 4 4 3.1 3.1 Table 3.1 Installation position of borehole stress meter in each station /m/m 1 1956m 21006m 2 31236m 41256m 3.2a d3123m 73m a1 万方数据 17 b2 c3 d4 3.2 Fig.3.2 Results of borehole stress observation 万方数据 18 3.2 13.7MPa 22.5m5.5MPa 3.29MPa8.4m 2.4MPa 2.4m 2MPa 25.1MPa 21.5m5.7MPa 4.6MPa9.3m 3.8MPa 1.4m 3.3MPa 32.9MPa 22.7m4.28Mpa 2.7MPa8.7m 2.2MPa 42.7MPa 4.7MPa43.5m 15m 5.2MPa4.5MPa 万方数据 19 7.5m 2.8MPa2.8m 3.2 Table 3.2Influence range of support pressure determined according to stress of borehole 1234 /m 63.861.540.863.257.3 /m 22.521.522.715.020.43 /m 8.49.38.77.58.5 3.3 Fig.3.3 A schematic diagram of advance support pressure distribution of working face 3.24 57.3m23.6m 8.5m3.3 3.4 8.5m 8.5m 万方数据 20 3.4 Fig.3.4 A sketch map of the distribution of support pressure around the working face X1007 400mY520mZ100m 3.5 3.5 Fig.3.5 Numerical calculation model 3.3 xy 500m 12.5MPa 万方数据 21 3.3 Table3.3Rock mechanics parameter /kg/m3/MPa/MPa/MPa/MPa/ 2400850089906.544.6331 2430813090605.615.4329 2130570041003.473.1525 13408608100.640.3430 2000330037003.432.9125 2460770082004.194.7330 1007 3.63.7 3.63.7 8m 8m 8m 3.6 Fig.3.6 Cloud map of lateral support pressure distribution in working face 万方数据 22 3.7 Fig.3.7 Curve of lateral support pressure distribution in working face 63m4m5m 6m7m8m 3m4m 5m6m 万方数据 23 7m8m 3.8 Fig.3.8 Vertical stress cloud map of coal columns with different sizes 3.9 Fig.3.9 Vertical stress distribution of coal pillar with different width 3.8 3.9 3.83.9 3m 10.3MPa3m 4m 5m 22.1MPa68m 3.7 5m 万方数据 24 10071008 1007 310081007 183.10 [61] 3.10 Fig.3.10 Survey station layout 3.11 30 Fig.3.11 Each point set up within 30 days of accumulated deation 02468101214161820 150 200 250 300 350 400 450 500 152 159 164 164 178 193 195 215 228 237 258 286 302 321 358 136 125 115 1007 万方数据 25 31008 31007 303.113.4 3.4 30 Table 3.4Measuring points set up 30 days of accumulated deation statistics 31007 /m/mm/mm 1228358171187.00 234321173194.00 334302191213.00 437286213214.00 5310258217219.00 6310237226244.00 7313228252249.00 8316215258260.00 9316195275281.00 10319193293298.00 11322178290295.00 12325164313317.00 1341164317326.00 1449159325328.00 15413152370371.00 16413136392389.00 17417125426429.00 18417115449456.00 31007159m 46 30170325mm31007 31007159m46 30370mm 31007 3 1007159m4631007 万方数据 26 46 1 2 57.3m23.6m 8.5m 3 8m 45m 5m 53100831007 159m463 100731007 万方数据 27 3.1 400m500m600m700m 800m 2 5 5m4.6m4.4m4.2m4m3.6m3.4m2.8m2.8m2.2m 万方数据 28 3.5m4m4.5m5m5.5m 1 4.14.24.3 4.4 400m500m 600m700m 800m 4.1 Fig.4.