Study on Aeolian Sand-Box Backfill Geomechanical Characteristics and Overlying Strata Control Effects
Author:
Zhao Bo12ORCID, Zhang Zhiyi12, Gong Xiaoping12, Wang Wei12, Tong Xiaoyong3, Chen Hui12, Guan Weiming12ORCID, Li Xin12, Feng Shuo12, Yang Dezhi4, Huang Lubo4, Zhao Yuhang1
Affiliation:
1. School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China 2. Collaborative Innovation Center of Green Mining and Ecological Restoration for Xinjiang Mineral Resources, Urumqi 830046, China 3. The First Hydrology Engineering Geological Brigade of Xinjiang Bureau of Geology and Mineral Resources, Urumqi 830046, China 4. No. 156 Coalfield Geological Exploration Team, Xinjiang Uygur Autonomous Region Coalfield Geological Bureau, Urumqi 830046, China
Abstract
The aeolian sand-box backfilling method proves effective for environmentally friendly coal extraction in northwestern regions, including Xinjiang. This study investigated the geomechanical characteristics of aeolian sand-box backfill material and its control effects on overlying strata through indoor experiments, mechanical analysis, and numerical simulations. Uniaxial compression tests on models with varying mesh sizes, wire diameters, and dimensions revealed that larger mesh sizes and wire diameters increased the bearing capacity of the aeolian sand-box backfill material, while increasing dimensions had the opposite effect. A mechanical analysis of the metal mesh box deformation produced equations describing its restraining force. Subsequent experiments and simulations on models of different dimensions consistently demonstrated the material’s mechanical properties, with stress-displacement curves closely aligned. 3DEC5.2 software simulations highlighted the effectiveness of aeolian sand-box backfill material in controlling displacement and stress variations in goaf areas. Notably, smaller-sized backfill material exhibited a more pronounced impact on controlling overlying strata displacement and stress development.
Funder
National Natural Science Foundation of China Natural Science Youth Project of the Autonomous Region’s University Research Plan Tianshan Youth Program for Young Doctoral Scientific and Technological Talent Cultivation in Xinjiang Uygur Autonomous Region Xinjiang Uygur Autonomous Region Major Science and Technology Special Project
Subject
Geology,Geotechnical Engineering and Engineering Geology
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