文献类型：期刊文献

英文题名：Investigating polymeric foam materials as compressible layer for tunnelling in squeezing ground conditions

作者：Tian, Hongming[1];Chen, Weizhong[1];Tan, Xianjun[1];Tian, Yun[2];Zhang, Ning[3]

机构：[1]Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[3]Nanjing Univ Sci & Technol, Sch Sci, Xiaolingwei 200, Nanjing 210094, Peoples R China

年份：2022

卷号：122

外文期刊名：TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000765025200005)、、EI(收录号：20220511560942)、Scopus(收录号：2-s2.0-85123578769)、WOS

基金：The authors gratefully acknowledge the support of the National Natural Science Foundation of China (Grant Nos. 5217090638, 51991392 and 51922104), the National Key Research and Development Program of China (Grant No. 2021YFB2300506).

语种：英文

外文关键词：Polymeric foam; Compressible layer; Rheological deformation; Squeezing ground conditions

外文摘要：Installation of a compressible layer between primary support and secondary lining is a feasible solution to decrease damage of the secondary lining induced by the time-dependent deformation in the squeezing tunnel. Laboratory tests and numerical analysis were conducted to investigate the feasibility of the polymeric foam for the compressible layer in a squeezing tunnel. The PU (Polyurethane) foam (density 70 kg/m(3)-100 kg/m(3)) and PE (Polyethylene) foam (density 90 kg/m(3)-130 kg/m(3)) are chosen as candidate filling materials of the compressible layer. The stress-strain curves of the candidate materials show a clear stress plateau stage, and the deformation capability and stress of the plateau stage can meet the requirements of the compressible layer. PU foam with density 80 kg/m(3) is finally selected due to its energy absorption capability for the compressible layer. The performances of the PU foam compressible layer under uniform and nonuniform squeezing deformation are simulated, the results show that the stress and failure zone of the secondary lining can be clearly decreased by the PU foam compressible layer, and the tension stress of secondary lining induced by non-uniform tunnel deformation can be avoided. The mechanical performance of the PU foam indicates the feasibility of using polymeric foam as the compressible layer in squeezing ground conditions.