Abstract
The stability of retained roadway plays an important role in the safety production of coal mine underground working face. Taking the 21,101 auxiliary haulage gate in Yaping Mine as the engineering background, the supporting technology was systematically studied. Firstly, based on the previous situation of pillar setting and surrounding rock failure and deformation in double roadway layout, the reasonable size of pillar between roadways was studied. The width of the broken zone was realized as 2.95 m by theoretical analysis, and then the width of pillar between roadways was determined as 7.95 m. On this basis, the law of stress evolution and retained roadway deformation with the pillar width of 6 m, 8 m, 10 m, 12 m, 15 m under the influence of two times mining were analyzed, comprehensive analyzed the above research results, 8 m in width of pillar between roadways was determined. Secondly, the failure rules of pillar between roadways, the failure rules and the failure process of retained roadways during two times mining were revealed: the range between 70 m in front of the work and 80 m behind the work was determined as the mining influence area according to the damage degree of coal pillar, the failure depth of surrounding rock in retained roadway during the two times mining was the largest in the pillar side, the second in the roof and the coal wall side, the smallest in the floor, and the damage degree was the largest in pillar side, the second in floor, the smaller in roof and wall, and the overall failure of roadway was asymmetric. Finally, on the basis of the above research results, considering all kinds of influencing factors and technical difficulties of retained roadway surrounding rock support, the system analysis method was used to determine the combined support technology with high strength allowable cables support + asymmetric cables support + bolts support system + concrete floor-allowable pressure non-repeated supports dynamic strengthening support. Practice shows that the combined support technology is scientific and reliable, which can meet the safety mining requirements in large mining height face with double roadways layout.
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References
Aksoy CO, Ogul K, Topal I (2012) Numerical modeling of non-deformable support in swelling and squeezing rock. Int J Rock Mech Min Sci 52:61–70
Carranza-Torres C (2009) Analytical and numerical study of the mechanics of rockbolt reinforcement around tunnels in rock masses. Rock Mech Rock Eng 42:175–228
Cheng Q, Shi YK, Zuo LQ (2019) Numerical simulation and analysis of surface and surrounding rock failure in deep high-dip coal seam mining. Geotech Geol Eng 37:4285–4299
Das M (1986) Influence of width/height ratio on post-failure behaviour of coal. Int J Min Geol Eng 1:79–87
Gao GQ, Stead Doug, Kang HP (2015) Numerical simulation of squeezing failure in a Coal Mine roadway due to mining-induced stresses. Rock Mech Rock Eng 48:1635–1645
Hao YH, Azzam R (2005) The plastic zones and displacements around underground openings in rock masses containing a fault. Tunn Undergr Space Technol 20:49–61
Kang HP, Wang JH, Lin J (2010) Study and applications of roadways support techniques for coal mines. J Chin Coal Soc 35:1809–1814 (in Chinese)
Kang HP, Yan LX, Guo XP (2012) Characteristics of surrounding rock deformation and reinforcement technology of retained entry in working face with multi-entry layout. Chin J Rock Mech Eng 31:2022–2036 (in Chinese)
Kang YS, Liu QS, Gong GQ, Wang HC (2014a) Application of a combined support system to the weak floor reinforcement in deep underground coal mine. Int J Rock Mech Min Sci 21:143–150
Kang YS, Liu QS, Xi HL (2014b) Numerical analysis of THM coupling of a deeply buried roadway passing through composite strata and dense faults in a coal mine. Bull Eng Geol Environ 73:77–86
Li XH, Ju MH, Jia SK, Chong ZH (2016) Study of influential factors on the stability of narrow coal pillar in gob-side entry driving and its engineering application. J Min Saf Eng 33:761–769 (in Chinese)
Li HC, Zhao W, Zhou K, Liu YN, An XL, Gao G (2019) Study on the effect of bolt anchorage in deep roadway roof based on anchorage potential design method. Geotech Geol Eng 37:4043–4055
Liu HH, Rutqvist J, Birkholzer JT (2011) Constitutive relationships for elastic deformation of clay rock: data analysis. Rock Mech Rock Eng 44:463–468
Liu W, Pang L, Liu Y, Du Y (2019) Characteristics analysis of roof overburden fracture in thick coal seam in deep mining and engineering application of super high water material in backfill mining. Geotech Geol Eng 37:2485–2494
Petho SZ, Selai C, Mashiyi D, Vander Merwe JN (2012) Managing the geotechnical and mining issues surrounding the extraction of small pillars at shallow depths at Xstrata Coal South Africa. J Southern Afr Inst Min Metall 112:105–118
Pusch R (1989) Alteration of the hydraulic conductivity of rock by tunnel excavation. Int J Rock Mech Min Sci Geomech Abstr 26:79–83
Pusch R, Stanfors R (1992) The zone of disturbance around blasted tunnels at depth. Int J Rock Mech Min Sci Geomech Abstr 29:447–456
Qian MG, Shi PW, Xu JL (2010) Ground pressure and strata control. China University of Mining & Technology Press, China
Shabanimashcool M, Li CC (2013) A numerical study of stress changes in barrier pillars and a border area in a long wall coal mine. Int J Coal Geol 106:39–47
Shen BT (2014) Coal mine roadway stability in soft rock: a case study. Rock Mech Rock Eng 47:2225–2238
Tian H, Chen W, Yang D, Dai Y, Yang J (2016) Application of the orthogonal design method in geotechnical parameter back analysis for underground structures. Bull Eng Geol Environ 75:239–249
Wang XY (2012) Rational position and control technique of roadway driving alone next goaf in fully mechanized top coal caving face. J Chin Coal Soc 37:1546–1569 (in Chinese)
Wang H, Jiang Y, Xue S, Shen B, Wang C, Lv J, Yang T (2015) Assessment of excavation damaged zone around roadways under dynamic pressure induced by an active mining process. Int J Rock Mech Min Sci 77:265–277
Wang H, Chen WZ, Wang QB, Zheng PQ (2016) Application of a combined supporting technology with U-shaped steel support and anchor-grouting to surrounding soft rock reinforcement in roadway. J Cent South Univ 23:898–905
Wang Q, Fan YP, Li G, Guo WY, Yan DH, Zhang LP (2017) Research on width of pillar between roadways of fully mechanized caving face with double roadways layout in thick coal seam. Rock Soil Mech 38:3395–3405 (in Chinese)
Wilson CR, Witherspoon PA, Long JCS, Galbraith RM, DuBois AO, McPherson MJ (1983) Large-scale hydraulic conductivity measurements in fractured granite. Int J Rock Mech Min Sci Geomech Abstr 20:269–276
Xie GX, Yang K, Chang JC (2006) Effect of coal pillar width on the stress distribution law of surrounding rocks in fully mechanized top-coal caving mining face. J Univ Sci Technol Beijing 28:1005–1008 (in Chinese)
Acknowledgements
This study was supported by the Key R & D Program of China (2017YFC0804305); the Key R & D Program of Shanxi Province (201803D121005); the Science and Technology Innovation Venture Capital Special Program of Tiandi Co., Ltd (2018-TD-QN040, 2018-TD-QN035).
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Wang, Q., Wang, B. Combined Support Technology of Retained Entry in Large Mining Height Face with Double Roadways Layout. Geotech Geol Eng 38, 4661–4674 (2020). https://doi.org/10.1007/s10706-020-01317-2
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DOI: https://doi.org/10.1007/s10706-020-01317-2