Visualizing the dynamic progression of backward erosion piping in a Hele-Shaw cell  

作　　者：Gang ZHENG Jing-bo TONG Tian-qi ZHANG Zi-wu WANG Xun LI Ji-qing ZHANG Chun-yu QI Hai-zuo ZHOU Yu DIAO 

机构地区：[1]MOE Key Laboratory of Coast Civil Structure Safety,Tianjin University,Tianjin 300072,China [2]School of Science,Tianjin University,Tianjin 300072,China [3]China Railway Design Corporation,Tianjin 300308,China [4]National Engineering Laboratory for Digital Construction and Evaluation Technology of Urban Rail Transit,Tianjin 300308,China

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2022年第11期945-954,共10页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：the National Engineering Laboratory for Digital Construction and Evaluation Technology of Urban Rail Transit(No.2021GY01);the National Natural Science Foundation of China(No.41630641)。

摘　　要：With the utilization of underground space,backward erosion piping(BEP)has been observed in many underground structures(e.g.,shield tunnels)founded on sandy aquifers.However,due to invisibility,the geometry of the eroded pipe and its spatial evolution with time during the piping process was still not clear.In this study,we developed a Hele-Shaw cell to visualize the dynamic progression of BEP.With imaging process technology,we obtained a typical process of BEP(the erosion process can be divided into a piping progression phase and a piping stabilization phase),quantitatively characterized the formation of erosion pipes,and compared the patterns of erosion(e.g.,the erosion area A and the maximum erosion radius R)that spontaneously develop under different fluxes of water.The most interesting finding is that the sand grains in a thicker Hele-Shaw model are easier to dislodge,which is possibly due to the granular system in a thicker model having more degrees of freedom,reducing the stability of the sand grains.

关 键 词：Backward erosion piping(BEP) Dynamic progression Hele-Shaw cell Visualize Imaging processing technology 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]