Abstract In order to study the applicability of the macro-polyolefin fiber reinforced shotcrete layer to permanent single-shell lining in tunnels, the mechanical mechanism of the macro-polyolefin fiber reinforcement in concrete is firstly analyzed based on the mechanics principle of synthetic fiber shotcrete structure, and then the mechanical property and durability of macro-polyolefin fiber reinforced shotcrete is tested in the laboratory. Besides, the monitoring and measurement results of the crown settlement, horizontal convergence and the ground surface settlement are analyzed based on the project case of Xizhen Station of Qingdao Metro, and the three dimensional numerical analysis is also conducted by the FLAC3D. The results show that the macro-polyolefin fiber reinforced shotcrete has a high compressive and tensile strength, good toughness and excellent durability, low rebound rate in spraying operation during the field implementation process. Therefore, it is an ideal support material for the permanent singleshell lining with good application value.
Abstract：
In order to study the applicability of the macro-polyolefin fiber reinforced shotcrete layer to permanent single-shell lining in tunnels, the mechanical mechanism of the macro-polyolefin fiber reinforcement in concrete is firstly analyzed based on the mechanics principle of synthetic fiber shotcrete structure, and then the mechanical property and durability of macro-polyolefin fiber reinforced shotcrete is tested in the laboratory. Besides, the monitoring and measurement results of the crown settlement, horizontal convergence and the ground surface settlement are analyzed based on the project case of Xizhen Station of Qingdao Metro, and the three dimensional numerical analysis is also conducted by the FLAC3D. The results show that the macro-polyolefin fiber reinforced shotcrete has a high compressive and tensile strength, good toughness and excellent durability, low rebound rate in spraying operation during the field implementation process. Therefore, it is an ideal support material for the permanent singleshell lining with good application value.
LI Deming1 WEN Shuyi1 ZHANG Jianwei2 YAN Jinxiu1
.Performance Test and Engineering Application of Macro-polyolefin Fiber Reinforced Shotcrete Used as Single-shell Lining[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(2): 195-203
2021, Vol. 58 