Floor Heave Controlling Technology of Deep Soft Rock Roadway

2012 ◽  
Vol 170-173 ◽  
pp. 68-71 ◽  
Author(s):  
Zhan Jin Li ◽  
Shi Bo Li ◽  
Xue Li Zhao
Keyword(s):  
Soft Rock ◽  
Engineering Practice ◽  
Bending Rigidity ◽  
Line Field ◽  
Floor Heave ◽  
Simulation Results ◽  
Soft Rock Roadway ◽  
Adjacent Rock ◽  
Coupling Support ◽  
Rock Roadway

The floor heave is one of soft rock roadway distortion. Based on soft rock supporting theory and engineering practice, the program bolt-mesh-anchors and floor corner, bolts coupling support to control floor heave of the soft rock roadway is proposed. Numerical simulation results show that bolt-anchors can mobilize the strength of the deep adjacent rock, at the same time, and properly arranged floor corner bolts with high bending rigidity can cut the slip-line field and achieve the goal of controlling floor heave effectively.

Study on Stability for Intersection of Deep Soft Rock Roadway

2011 ◽  
Vol 243-249 ◽  
pp. 2666-2669
Author(s):  
Zhan Jin Li ◽  
Yang Zhang ◽  
Xue Li Zhao
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Intersection Problem ◽  
The Third ◽  
Geological Conditions ◽  
Control Stability ◽  
Soft Rock Roadway ◽  
Crossing Point ◽  
Coupling Support ◽  
Rock Roadway

With the depth increasing continuously, more complicated of geological conditions, will make intersection in deep soft rock roadway is very difficult to support. In order to solve the intersection problem of difficult to support, combined with the third levels of the Fifth Coal Mine of Hemei, the coupling supporting design—anchor-mesh-cable + truss to control stability of crossing point—is proposed. Based software of FLAC3D, simulate the program applicable in deep soft rock roadway intersection. Application results show that the coupling support technology of anchor-mesh-cable + truss can effectively control the deformation of intersection in deep soft rock roadway.

scholarly journals A Study of Soft Rock Roadway Coupling Support in Xiajing Coal Mine

2014 ◽  
Vol 84 ◽  
pp. 812-817
Author(s):  
Li Xuefeng ◽  
Cheng Guihai ◽  
Li Xiaoquan ◽  
Zhang Ruichong
Keyword(s):  
Coal Mine ◽  
Soft Rock ◽  
Soft Rock Roadway ◽  
Coupling Support ◽  
Rock Roadway

Mechanism and support measures of floor heave mainly caused by horizontal extrusion stress in soft rock roadway

2010 ◽  
pp. 387-394
Author(s):  
Yang Xiaojie ◽  
Wang Fuqiang ◽  
Guo Zhibiao ◽  
Han Qiaoyun ◽  
Zhang Zhao ◽  
...  
Keyword(s):  
Soft Rock ◽  
Support Measures ◽  
Floor Heave ◽  
Soft Rock Roadway ◽  
Rock Roadway

Mechanism and support measures of floor heave mainly caused by horizontal extrusion stress in soft rock roadway

2010 ◽  
pp. 387-394
Author(s):  
Yang Xiaojie ◽  
Wang Fuqiang ◽  
Guo Zhibiao ◽  
Han Qiaoyun ◽  
Zhang Zhao ◽  
...  
Keyword(s):  
Soft Rock ◽  
Support Measures ◽  
Floor Heave ◽  
Soft Rock Roadway ◽  
Rock Roadway

scholarly journals A Case Study of Optimization and Application of Soft-Rock Roadway Support in Xiaokang Coal Mine, China

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Shuai Guo ◽  
Xun-Guo Zhu ◽  
Xun Liu ◽  
Hong-Fei Duan
Keyword(s):  
Soft Rock ◽  
Surrounding Rock ◽  
Geological Conditions ◽  
Floor Heave ◽  
Roadway Support ◽  
Soft Rock Roadway ◽  
Surrounding Rock Stress ◽  
Rock Roadway

The roadway of S2S2 fully mechanized caving face (FMCF) in Xiaokang Coal Mine is one of the most typical deep-buried soft-rock roadways in China and had been repaired several times. In order to figure out the failure reasons of the original roadway support, the geological conditions were investigated, the surrounding rock stress was monitored, the rib displacement, roof separation, and floor heave were in situ measured, and the performance of the U-shaped steel support was simulated. The above analysis results indicated that the support failure was mainly caused by (1) the unreasonable arch roadway section, (2) the high and complex surrounding rock stress, (3) the failure control of the floor heave, and (4) the inadequate self-supporting capacity of the surrounding rock. For optimizing, the roadway section was changed to circle and a new full-section combined support system of “belt-cable-mesh-shotcrete and U-shaped steel-filling behind the support” was adopted, which could specifically control the floor heave, allow the roadway deformation in control, and improve the self-supporting ability and stress field of the surrounding rock. To determine the support parameters, the selected U-shaped steel support was verified by simulation, and various bolt-cable support schemes were simulated and compared. Finally, such an optimized support scheme was applied in the roadway of the next replacement FMCF. The in situ monitoring showed that the rib-to-rib convergence and roof-to-floor convergence were both controlled within 600 mm, which indicated that the roadway was effectively controlled. This case study has important reference value and guiding function for the optimal design of the soft-rock roadway support with similar geological conditions.

scholarly journals Numerical Analysis and Control Study on Surrounding Rock Deformation of Deep Soft Rock Roadway

2021 ◽  
Vol 257 ◽  
pp. 03017
Author(s):  
Enbing Yi
Keyword(s):  
Numerical Analysis ◽  
Plastic Zone ◽  
Large Scale ◽  
Soft Rock ◽  
Design Parameters ◽  
Engineering Practice ◽  
Support Design ◽  
Left And Right ◽  
Soft Rock Roadway ◽  
Rock Roadway

Aiming at the problem of large-scale deformation of the track and alleys in the East Second Mining Area, the numerical analysis method is used to analyze the stress and deformation law of the roadway. The results show that the critical depth of the roadway deformation is 800m, the shear stress of the deep roadway is about 8.7MPa in the left and right shoulders, and the vertical stress increases sharply in the range of 0~5.5m from the center of the roadway, and is 6~ from the center of the roadway. The peak value is reached within 8m, the plastic zone of the roadway roof is 2.6m, the left and right plastic zones are 5.2m and 5.4m, respectively, and the plastic zone of the floor is 6.1m. This result can provide a basis for the design parameters of deep soft rock roadway support. The engineering practice proves that the support design effectively controls the strong deformation of the roadway and achieves better support effect.

Mechanics model and numerical analysis of floor heave in soft rock roadway

2011 ◽  
Vol 17 (4) ◽  
pp. 372-376 ◽  
Author(s):  
Chuan-qu Zhu ◽  
Yong Wang ◽  
Miao-ming Chen ◽  
Zhi Chen ◽  
Hong-ming Wang
Keyword(s):  
Numerical Analysis ◽  
Soft Rock ◽  
Mechanics Model ◽  
Floor Heave ◽  
Soft Rock Roadway ◽  
Rock Roadway
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