## 6 Conclusions  
The GSCRF technique is implemented on the soft roof working face of a mine in eastern China. Taking the haulage roadway of the 1510 working face in Xinyi Coal Mine as an example, through theoretical analysis and industrial experiments, the feasibility of this method is discussed, and the surrounding rock support scheme is proposed. This project has made a new exploration of pillarless coal mining under soft rock roof conditions.  
The main conclusions of this analysis are as follows:  
1. A pillarless mining technique by GSCRF under soft rock roof conditions is proposed and practiced. The technical principle of this roadway-forming method is described. This technique can effectively control the immediate roof in the roadway. It lets the immediate roof fall to form a wall outside the roadway. Compared with the traditional pillarless mining techniques, it does not need pillars for roadway protection and does not disturb the mining of the working face.
2. A method for determining the feasibility of GSCRF is proposed. A roof \"cavability\", \"wall formability\" and \"impact free\" formula is established. Based on this, the feasibility determination criteria for pillarless mining by GSCRF are created. The proposed support scheme of \"cable + steel beams + yielding prop\" has a good control effect on the overlying strata.
3. The GSCRF effect of the 1510 working face is good with minimal strata behavior and no obvious dynamic pressure impact. The tension on the anchor cables is relatively stable as a whole with no breakage failure. The support parameters are reasonable. The convergence of the roadway is within the controllable range. After the roadway is repaired, it can allow for ventilation and transportation.  
Conceptualization, J.H. and Y.S. ([PERSON]); methodology, J.H.; resources, G.L.; data curation, P.Z.; writing--original draft preparation, P.Z.; writing--review and editing, Y.S. ([PERSON]) and H.L.; visualization, P.Z.; supervision, J.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by National Natural Science Foundation of China, grant number 52174121 and Project of Shandong Province Higher Educational \"Youth Innovation Science and Technology Plan\" Team, grant number 2021 KJ060.  
Not applicable.  
Thanks to [PERSON], who provided the main ideas and financial support for the research. [PERSON] is responsible for the collation and writing of papers. Thanks to [PERSON], [PERSON], [PERSON] from the Shandong University of Science and Technology.  
The authors declare no conflict of interest.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Method**} & **Mining Roadway with Large Coal Pillar** & **Gob-Side Excavation of Small Coal Pillars** & **Roadway-Side-Filled Pillarless Mining** & **GSCRF** \\ \hline Roadway surrounding rock pressure & Large & Relatively small & Relatively small & Small \\ \hline Pillar existence & Exist & Exist & Exist & None \\ \hline Pillar deformation & Large & Large & Large & None \\ \hline Impact of working face mining & Exist & Exist & None & None \\ \hline Impact of working face mining & None & None & Exist & None \\ \hline \hline \end{tabular}
\end{table}
Table 4: Technical Features Comparison Table.