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Experimental analysis on the interaction between underground structures and sand layer under groundwater level change

查看全文 作　　者：Hanlong [1,2,3]Liu;Weixin [2]Sun;Yanmei [4]Zhang;Wengang [1,2,3]Zhang;Fucheng [2]Han;Weijia [2]Su 高影响力作者 机构地区：[1]Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Chongqing 400045,China;[2]School of Civil Engineering,Chongqing University,Chongqing 400045,China;[3]National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas,Chongqing University,Chongqing 400045,China;[4]School of Aerospace Engineering,Chongqing University,Chongqing 400045,China高影响力机构 出　　处：《Underground Space》索引2023年第3期,共22页高影响力期刊 基　　金：the financial support from National Major Scientific Instruments Development Project of China(Grant no.5202780029);High-end Foreign Expert Introduction program(No.DL2021165001L);Science and Technology Research Program of Chongqing Municipal Education Commission(No.KJCXZD2020002). 摘　　要：Groundwater level change stands a momentous role in affecting the geotechnical construction stability and safety of underground structures.Global warming and active underground construction cause conspicuous changes in the groundwater level,which further leaves an impact on the underground structures’serviceability.To reveal the interaction between underground structure and soil under groundwater level change in the sand layer,model tests of circular transportation tunnel and rectangular utility tunnel were carried out.With the self-designed experimental equipment and innovative experimental methods,the changes in tunnel stress,bending moment,buoyancy,and vertical displacement of the rise and drawdown of the groundwater level in the sand layer were studied.The results revealed the developments of concentrated structural forces during the rising and falling process of the groundwater water level,indi-cating critical locations that should be strengthened.Meanwhile,both tunnels showed the same movement trend:settling first,floating afterwards and settling at last.And it is concluded that no reduction is required when calculating buoyancy in sands using measured pore pressure.Conclusions can provide a notable reference for future related research and engineering designs. 关 键 词：Groundwater level change Circular transportation tunnel Rectangular utility tunnel Model test Mechanical behavior BUOYANCY
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