Utilization status of underground space of mine remains and application prospect of structural filling technology
FENG Guorui
CUI Yekai
LI Zhu
WANG Zhen
MENG Xiangtian
WU Guowei
ZHAN Mengnan
YAO Xin
Abstract：Intensive coal mining in China has generated vast underground voids,whose resource utilization holds signific-ant implications for alleviating land pressure,preventing secondary disasters,and achieving carbon neutrality goals.This paper systematically reviews current comprehensive utilization technologies for coal underground spaces,examines re-search progress in CO2 geological sequestration and underground reservoir technologies,and analyzes critical challenges and development prospects through the lens of structural backfill technology proposed by our research team.Existing stud-ies reveal that while CO2 sequestration via industrial solid waste mineralization shows promise,critical issues persist re-garding the permeability and long-term stability of carbon fixation materials,along with unclear damage mechanisms of reservoir surrounding rocks under multi-field coupling effects.Underground reservoir technology constructs water storage systems through goaf modification,yet faces critical challenges of cyclic hydraulic pressure-induced wet-dry fatigue in dam structures.Structural backfill technology establishes stable underground structures through low backfill ratio and high-stability designs,providing mechanical guarantees for functional space utilization,but confronts bottlenecks including un-defined critical backfill positions,material performance-function mismatches,unclear multi-field coupling mechanisms,and insufficient intelligent processes.Future research should prioritize functional backfill material development,cross-scale THMC multi-field coupling modeling,and intelligent perception-digital twin integration to establish a technical sys-tem encompassing"geological precision detection-functional orientation design-dynamic optimization control".Through interdisciplinary collaboration,policy support,and standardization efforts,this study aims to transform underground voids from environmental burdens into strategic resources,providing theoretical and technical foundations for green mining transition and carbon neutrality achievement.
Keywords：underground space of mine remainsCO2 underground storageunderground reservoirstructural fillingcollaborative application
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 1-14 )