Title: Theoretical study and application on the distribution conformation of loads on the overlay of key stratum

Authors: Feilong Guo; Xiangbin Meng; Wenyang Zhang; Hongjie Liu

Addresses: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China ' School of Resources and Safety Engineering, Chongqing University, Chongqing, 400030, China ' School of Resources and Safety Engineering, Chongqing University, Chongqing, 400030, China ' School of Resources and Safety Engineering, Chongqing University, Chongqing, 400030, China

Abstract: A load transfer model for stacked beams in the upper and lower rock layers is established using Timoshenko beams. The results show that the greater the thickness ratio of overlying rock layers, the greater the load transfer. When the thickness ratio is 2, the intermediate pressure reaches 0.89 q and the boundary pressure is 0.72 q. The elastic modulus ratio will affect the magnitude of load transfer. The greater the softness of the upper rock layer, and the greater the load transfer to the underlying rock layer. When the ratio of the elastic modulus of the upper and lower rock layers is less than 1/10, the load can be transferred to the underlying key layer. Poisson ratio has a minimal effect on the load transfer. Adopting on-site measurement and composite blasting cutting of the top of the key layer shows good application of the project.

Keywords: stacked beam; key stratum; interlayer pressure; Timoshenko beam.

DOI: 10.1504/IJMME.2026.154340

International Journal of Mining and Mineral Engineering, 2026 Vol.17 No.2, pp.141 - 159

Received: 09 Oct 2025
Accepted: 01 Dec 2025
Published online: 23 Jun 2026 *

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