A Study on the Mechanism and Controlling Techniques of Roadway Deformations Under High In Situ Stress Conditions
- 15 Downloads
To successfully control the roadway deformations under high in situ stress conditions, first, field investigations were conducted on the haulage roadway deformation at the -850 section in Qu Jiang mine. Besides, an analysis was performed on the roadway deformation characteristics. Moreover, four supporting strategies were proposed based on the geological conditions and the roadway deformation characteristics. And these strategies were simulation using FLAC3D. Furthermore, the supporting mechanism of the first, the second and grouting supports was analyzed. The first supporting was the preliminary support installed at the stress release stage of surrounding rocks, and limited deformations were permitted in this stage. To permanently stabilize the roadway, the second supporting then was installed to restrain the creep deformation and improve the strength and integrity of the fissured rock masses. Grouting, which can infill and cement the fissures, was used to improve the anchor forces of the bolts and cable and promote the delivery and diffusion of the supporting resistances. Simulation results indicate that roadway deformations are successfully controlled by the proposed strategies where bolts, steel nets, concrete spraying, cables, and grouting were applied.
KeywordsLarge deformation High in situ stress Numerical simulation Roadway supporting
The study is supported by the National Natural Science Foundation of China (Grant Numbers 51804109; 51434006; 51874130) and the Scientific Research Foundation for Doctor of Hunan University of Science and Technology (Grant Number E51851).
Compliance with Ethical Standards
Conflict of interest
The authors declare that they have no conflicts of interest.
- Chen DF, Feng XT, Xu DP et al (2015) An equivalent numerical method for evaluating the reinforcing effectiveness of grouted bolts. Rock Soil Mech 36(4):1195–1204Google Scholar
- Fang XQ, Zhao JJ, Hong MY (2012) Failure mechanism and control measure of roadway deformation with fractured surrounding rock in deep mine. J Min Saf Eng 29(1):1–7Google Scholar
- Guo PF, He MC, Wang J (2018) Study on coupling support technique in the roadway of Hecaogou no. 2 coal mine with soft roadway of large deformation. Geotech Geol Eng 36:1161–1173Google Scholar
- Kang HP, Lin J, Yang JH et al (2011) Stress distribution and synthetic reinforcing technology for chamber group with soft and fractured surrounding rock. Chin J Geotech Eng 33(5):808–814Google Scholar
- Li GC, Sun H, Zhang N et al (2015b) Application research on new high-strength anchor cable bundle based on the shear stress distribution of anchor cable. J China Coal Soc 40(5):1008–1014Google Scholar
- Li ZP, Xu JC, Du JQ (2016) Application of bolt–mesh–cable coupling support with high convex strip in deep roadways. Electr J Geotech Eng 21(12):4463–4473Google Scholar
- Liu HT, Li JQ (2015) Research on timeliness of coordination support of bolting-mesh-shotcreting-grouting in deep roadway. J China Coal Soc 40(10):2347–2354Google Scholar
- Ma NJ, Zhao XD, Zhao ZQ et al (2015) Stability analysis and control technology of mine roadway roof in deep mining. J China Coal Soc 40(10):2287–2295Google Scholar
- Meng QB, Han LJ, Qiao WG et al (2016) Supporting effect and application of bolt-net-anchor coupling support under extremely weak cementation formation. J Min Saf Eng 33(5):770–778Google Scholar
- Song YJ, Han LJ, Gao JM (2013) Instability mechanisms and dynamic superposition coupling support in extremely fractured and soft rock roadway. J Min Saf Eng 30(3):355–362Google Scholar
- Tao WB, Chen TL, Tang B (2019) Response law of horizontal principal stress to mechanical characteristics of anchorage zone. J Harbin Eng Univ 40(6):1–7Google Scholar
- Wang YX, Shan SB, Cao P et al (2017) Numerical simulation on unloading deformation and supporting effect of soft rock excavation. J Hefei Univ Technol 40(12):1643–1648Google Scholar
- Yan H, He FL, Wang SG (2014) Safety control and evaluation of roadway with super-large cross-section and soft-weak thick coal roof. Chin J Rock Mech Eng 33(5):1014–1023Google Scholar
- Zhang JW (2017) Theoretical analysis on failure zone of surrounding rock in deep large-scale soft rock roadway. J China Univ Min Technol 46(2):292–299Google Scholar
- Zheng GQ, Lian HQ, Ling BC et al (2013) Measurement of geostress in deep coal seams in Guqiao coalmine of Huainan coal field. J Liaoning Tech Univ (Nat Sci) 32(10):1324–1328Google Scholar