Abstract
Although solid backfilling materials are featured with obvious nonlinear stress-strain properties, for a long time, they have been usually simplified as linear elastic materials for approximate calculation in mechanical analysis, so it is difficult to accurately reflect their deformation process. Based on test results of solid backfilling materials’ compaction characteristics, this paper provides a solution method to generate their elastic foundation coefficient. One multiparameter elastic foundation has been used to reflect stress-strain characteristics of solid backfilling material. In addition, the paper establishes a thin plate on a nonlinear elastic foundation model by adopting semianalytical and seminumerical method and obtains the relational expression between roof deflection, roof stress, and backfilling material’s compressive deformation. In combination with geological conditions in a specific mine, the paper probes into what influence both backfilling material’s particle size and the initial compaction force that the backfilling material bears could exert on roof subsidence and stress. Finally, the proposed model has been verified with measured data from industrial tests.
Highlights
China’s economic development is highly dependent on coal resources
Many coal mines have to set their eyes on the excavation of the coal resources under buildings, water bodies, and railways
As a matter of fact, a great amount of valuable coal resources is being buried under buildings, water bodies, and railways; for instance, for large stateowned coal mines alone, the figure hits over 13.0 billion tons
Summary
China’s economic development is highly dependent on coal resources. As a matter of fact, coal accounts for over 56.8% of China’s energy consumption system and the demand is still growing. The magnitude of coal mining has been multiplied and recoverable reserves in numerous mines (especially in eastern China) have plummeted as well Faced with this situation, many coal mines have to set their eyes on the excavation of the coal resources under buildings, water bodies, and railways. Aimed at emancipating the coal resources and solving the problem of gangue accumulation on the ground surface, solid backfilling technology has been developed by backfilling solid waste like gangue into mined-out areas so as to effectively control strata movement and reduce surface deformation and ensure the safety of ground buildings [4–8]. In the process of compression, the backfilling body would play an increasingly supportive role for the roof and share part of the overlying strata load In this sense, strata movements are jointly controlled by backfilling material and hydraulic support as well as coal body which altogether constitute a new stope support system [13–16]. Based on test results analysis concerning backfilling materials’ mechanical properties, this literature establishes a nonlinear elastic foundation plate model using seminumerical and semianalytical method for the purpose of exploring characteristic of strata behavior in SBM. is study has been verified in combination with industrial test
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