大粒径SAP混凝土缓冲材料的物理力学性能研究

武哲书; 曹俊; 孙文昊; 崔臻; 张津

doi:10.3973/j.issn.2096-4498.2023.12.008

隧道建设 >

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

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

研究与探索

大粒径SAP混凝土缓冲材料的物理力学性能研究

武哲书 ,
曹俊 ,
孙文昊 ,
崔臻 ,
张津

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(1. 中铁第四勘察设计院集团有限公司，湖北武汉 430063； 2. 水下隧道技术国家地方联合工程研究中心，湖北武汉 430063； 3. 中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室，湖北武汉 430071； 4. 中国科学院大学，北京 100049)

武哲书（1991—），男，江苏淮安人，2020年毕业于清华大学，水利工程专业，博士，工程师，主要从事隧道与地下工程设计与研究工作。 E-mail: wzsfj@163.com。 *通信作者：崔臻， E-mail: zcui@whrsm.ac.cn。

网络出版日期: 2024-01-04

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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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摘要

为提高隧道抗错断结构缓冲层的压缩性能，增强穿越活动断层的隧道对于较大断层错动位移的消纳能力，提出并制备一种基于厘米级大粒径SAP成孔的新型多孔混凝土缓冲材料，开展基于含砂率、SAP体积分数与SAP集料粒径等因素设置的单因素试验，分析以上因素对SAP混凝土物理力学性能的影响。研究表明，SAP体积分数、含砂率对SAP混凝土力学性能具有显著影响，但影响规律有所差异，SAP集料粒径对SAP混凝土的影响较小。在此基础上对材料配比进行优化，获取具有一定力学强度、较大孔隙率且具有脆性破坏特性的缓冲材料，力学性能满足衬砌结构要求，压缩量大幅提高，可用于隧道穿越大位移活动断层抗错断结构。

关键词： 活动断层; 隧道缓冲材料; SAP混凝土; 抗压强度

本文引用格式

武哲书 , 曹俊 , 孙文昊 , 崔臻 , 张津 . 大粒径SAP混凝土缓冲材料的物理力学性能研究[J]. 隧道建设, 2023 , 43(12) : 2056 -2065 . DOI: 10.3973/j.issn.2096-4498.2023.12.008

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

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