An approach to predicting the compressive strength of reinforced broken rock mass

Subjects: Mine Engineering Technology >> Mine Geology submitted time 2025-07-17

Yanxu Guo Jinlong Wang Baohui Wang Chune Wang Ying Zhoua Shujing Chen Hongbo Wang Qingsong Zhang

Abstract： Grouting is a common technical measure to improve the mechanical properties of broken rock mass and ensure the stability of underground excavation. The strength characteristics of reinforced broken rock mass are important parameters in geotechnical engineering design. However, due to the complex structure of broken rock mass, the strength characteristics of reinforced broken rock mass are influenced by various factors, making quantitative studies of its strength extremely complex. To establish a reasonable approach for predicting the compressive strength of reinforced broken rock mass, this paper examines how various properties of broken rock mass (i.e., strength, volumetric block proportion, degree of fragmentation, shape, and angle) and the characteristics of cement stone body (i.e., cement stone body strength and interface strength) influence the reinforcement strength, and quantifies these effects. It reveals the mechanisms by which these factors influence the reinforcement strength. Considering factors such as rock shape, orientation, and intrinsic angle, a dimensionless quantitative method to describe rock structure is proposed. On this basis, a prediction model for the compressive strength of reinforced broken rock mass is established by comprehensively considering the properties of both the broken rock mass and the grout stone body. The prediction equation is validated using data from the literature, confirming the accuracy of the prediction model. The research findings provide a valuable reference for refining the reinforcement theory of broken rock mass.

Peer Review Status:Awaiting Review

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