# Study on Asymmetric Support of Anchor Cable with C-Shaped Tube in Inclined Coal Seam Roadway
## 5 Support Effect of Different Support Schemes
### Comparison of Supporting Effect between Asymmetric Scheme and Symmetrical Scheme  
Scheme 1 is the _ACC_ asymmetric support scheme, and Scheme 2 is the _ACC_ symmetric support scheme. As shown in Table 6, using Scheme 1 on the basis of the original support scheme, the maximum displacement of the roof and the total maximum displacement of the two sides were reduced by 14.1% and 14.9%, respectively. Using Scheme 2 on the basis of the original support scheme, the maximum displacement of the roof and the total maximum displacement of the two sides were reduced by 14% and 14.7%, respectively. It can be seen that using the _ACC_ asymmetric reinforcement scheme on the basis of the original support scheme can better control the deformation of the roadway compared with the _ACC_ symmetric reinforcement scheme. According to Figure 16,f,i, it can be seen that different reinforcement schemes result in similar distributions of plastic failure zones to the original support scheme, but with significantly reduced plastic zone ranges, particularly in the vicinity of the roof and the left and right sides. There was a noticeable improvement in the plastic zone at the top corner of the right side, and the asymmetry in the left and right regions was reduced to some extent. As shown in Table 6, when Scheme 1 was adopted on the basis of the original support scheme, the volume of the plastic zone was reduced by 27.7%, and when Scheme 2 was adopted on the basis of the original support scheme, the volume of the plastic zone was reduced by 19.1%. This indicates that the _ACC_ asymmetric reinforcement scheme  
Figure 16: Numerical simulation results under different support reinforcement schemes: (**a**) Scheme 1 vertical displacement; (**b**) Scheme 1 horizontal displacement; (**c**) Scheme 1 plastic zone; (**d**) Scheme 2 vertical displacement; (**e**) Scheme 2 horizontal displacement; (**f**) Scheme 2 plastic zone; (**g**) Scheme 3 vertical displacement; (**h**) Scheme 3 horizontal displacement; (**i**) Scheme 3 plastic zone. can effectively control the plastic failure zone and improve the stability of the roadway compared to the \(ACC\) symmetric reinforcement scheme. Ten monitoring points of displacement (points 1-10) located on the sides of the roadway, as shown in Figure 9, were selected as observation objects to study the effects of different reinforcement schemes on the horizontal displacement of the roadway sides. The results are presented in Table 7.  
As shown in Table 7, the horizontal displacement of the sides of the roadway decreased significantly for all monitoring points with the application of different reinforcement schemes, compared to the original support scheme. The trend of the horizontal displacement with respect to the distance from the roadway surface was found to be similar to that of the original support scheme. The asymmetry of the sides of the roadway with respect to the distance from the roadway surface for different reinforcement schemes is shown in Figure 17. It can be observed from Figure 17 that the asymmetry of the sides of the roadway increased with the distance from the roadway surface, and then decreased for all the different reinforcement schemes. In the case of Scheme 2, the asymmetry of the sides of the roadway increased significantly with depth, indicating that the symmetrical reinforcement scheme aggravated the asymmetric deformation characteristics of the sides. On the other hand, in the case of Scheme 1 or 3, the asymmetry of the shallow coal seam on both sides decreased significantly, and the asymmetry of the deep coal seam did not change significantly, resulting in a decrease in the overall asymmetry of the sides of the roadway. From Table 7 and Figure 17, it can be concluded that, compared with Scheme 2, the total displacement of the sides of the roadway at the same position is the smallest and the overall asymmetry of the sides of the roadway is also the smallest when Scheme 1 is applied.