Discontinuous deformation analysis for subsidence of fractured formations under seepage: A case study  

作　　者：Jingyao Gao Wei Wang Yiyang Tang Hongyun Fan 

机构地区：[1]School of Resources and Safety Engineering,Central South University,Changsha,410083,China [2]Department of Civil and Structural Engineering,Kyushu University,Fukuoka,819-0395,Japan [3]School of Environmental Studies,China University of Geosciences,Wuhan,430078,China [4]Henan First Geological Exploration Institute Co.,Ltd.,Zhengzhou,450001,China [5]School of Civil and Environmental Engineering,Nanyang Technological University,50 Nanyang Avenue,639798,Singapore

出　　处：《Rock Mechanics Bulletin》2024年第4期102-111,共10页岩石力学通报（英文）

基　　金：supported by China Scholarship Council(CSC,No.202108050072).

摘　　要：With the growing prominence of recycling projects of groundwater,the attention towards subsidence concerns in geological formations is intensifying.However,due to the long evolutionary time and complex underground discontinuities,the deformation field and subsidence mechanism are difficult to obtain.To this concern,this study implemented the Hydro-Mechanical Coupled Discontinuous Deformation Analysis(HM-DDA)in a groundwater recycling project located at a goaf mining site.The method for establishing numerical stratigraphic models and determining the required numerical parameters is introduced.This contributes to the comprehensive reconstruction of changes in in-situ stress within the goaf area,encompassing the initial stress equilibrium state,as well as the processes of water pumping and injection.The results indicated that the water injection process mitigated stress concentrations at both ends of the goaf area.Specifically,a 30-m rise in water head resulted in a corresponding elevation of the ground surface by 3.94 cm.

关 键 词：Discontinuous deformation analysis Seepage field Groundwater cycle application 

分 类 号：TU433[建筑科学—岩土工程]