PhysicoMechanical Properties of LargeSize Super Absorbent&nbsp;Polymer
Concrete Buffer Materials

WU Zheshu; CAO Jun; SUN Wenhao; CUI Zhen; ZHANG Jin

doi:10.3973/j.issn.2096-4498.2023.12.008

Tunnel Construction >

2023 , Vol. 43 >Issue 12: 2056 - 2065

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.12.008

PhysicoMechanical Properties of LargeSize Super Absorbent Polymer Concrete Buffer Materials

WU Zheshu ,
CAO Jun ,
SUN Wenhao ,
CUI Zhen ,
ZHANG Jin

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(1.China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,Hubei,China;2.National & Local Joint Engineering Research Center of Underwater Tunnel Technology,Wuhan 430063,Hubei,China;3.State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,Hubei,China;4.University of Chinese Academy of Sciences,Beijing 100049,China)

Online published: 2024-01-04

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Abstract

To improve the compressive performance of the buffer layer of the antidislocation structure of tunnels and enhance their capacity to absorb large dislocation displacement when crossing active faults, a novel porous concrete buffer material composed of centimetersized super absorbent polymer(SAP) particles is proposed and developed. Singlefactor experiments are conducted to analyze the effect of the sand content, SAP volume fraction, and particle size of SAP aggregates on the physicomechanical properties of SAP concrete. The results show that the SAP volume fraction and sand content considerably affect the mechanical properties of SAP concrete, with various influence patterns. However, the particle size of the SAP aggregate has a relatively minor effect. Based on these findings, the material mixing proportions are optimized to obtain a novel buffer material with adequate mechanical strength, a large void ratio, and brittle failure characteristics. The mechanical properties of the proposed SAP concrete meet the requirements of the lining structure, with a significant increase in compressibility, and can be effectively used for the antidislocation structure of tunnels crossing active faults with large dislocation displacement.

Key words： active fault; tunnel buffer material; super absorbent polymer concrete; compressive strength

Cite this article

WU Zheshu , CAO Jun , SUN Wenhao , CUI Zhen , ZHANG Jin .

PhysicoMechanical Properties of LargeSize Super Absorbent Polymer Concrete Buffer Materials

[J]. Tunnel Construction, 2023 , 43(12) : 2056 -2065 . DOI: 10.3973/j.issn.2096-4498.2023.12.008

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