**6. Conclusions**

In view of the problem of controlling the surrounding rock in large sections of whole coal cavern groups due to the influence of soft surrounding rock and a large section, this study proposes an innovative LBG support technology and obtains the following innovative conclusions, different from the perspective of improving the stress state of the surrounding rock:


(4) The stratified reinforcement ring concept of a LBG is proposed based on the obtained deformation mechanism to control surrounding rock deformation of the WCCG. The supporting technology of an anchor bolt (3 m), grouting anchor cable (8.3 m), and a long anchor cable (15 m) is proposed and adopted to connect the broken zone, the plastic zone, and the elastic zone in the gas storage cavern group with the large section. The roof subsidence and two-sided displacement are controlled at 140 mm and 120 mm, respectively, by using the supporting scheme of a LBG, and the surrounding rock deformation in the caverns is obviously reduced. The results of the numerical simulation and the field monitoring show that the LBG technology is effective for the stability control of the WCCG.

**Author Contributions:** Conceptualization, L.C. and Z.W.; methodology, Z.W.; software, L.C. and Z.W.; validation, L.C., W.W. and J.Z.; data curation, L.C. and Z.W.; supervision, W.W.; project administration, L.C., Z.W. and J.Z.; funding acquisition, Z.W. and J.Z. All authors have read and agreed to the published version of the manuscript.

**Funding:** The authors sincerely thank the following agents for their financial supports: the Scientific and Technological Project of Henan Province (222102320060), the Strength Improvement Plan of the Advantageous Disciplines of Zhongyuan University of Technology (SD202232), the Natural Science Foundation of China of Zhongyuan University of Technology (K2023QN013), the National Natural Science Foundation of China (52204264), and the Key Specialized Research and Development Breakthrough of Henan Province (222102320086).

**Data Availability Statement:** The data applied to support the results in this study are available from the corresponding author upon request.

**Conflicts of Interest:** The authors declare no conflict of interest.

### **References**


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