摘要
依托南京长江新济洲供水廊道项目泥水盾构工程,针对江底粉细砂地层和岩石地层中泥水盾构施工产生的废弃砂土,研究其在盾构同步注浆材料中再利用的适用性。通过改变砂土地层弃砂的粒径分布,研究其对砂浆性能的影响;针对岩石地层产生的废弃砂土,研究其颗粒形状对砂浆性能的影响,并对岩层弃砂制备同步砂浆进行配比优化。结果表明:该工程砂土层弃砂可直接代替原配比中的砂进行再利用,岩层弃砂通过调整配比亦能满足工程要求;增大砂层弃砂细度模数和砂粒含量可改善砂浆的流动性,但砂土黏粒含量过大会使砂浆流动性变差、凝结时间缩短、强度降低;岩层弃砂颗粒表面越粗糙,所制备砂浆流动性越差,凝结时间越短。合适配比下,盾构施工废弃砂土可应用于同步注浆,砂浆配比应随废弃砂土粒径分布和颗粒形状的变化做出适当调整。
Based on the slurry shield engineering of Xinjizhou water supply corridor project in Nanjing Yangtze River,the applicability of reusing waste sand as shield synchronous grouting materials was studied,which was produced by slurry shield construction in silty fine sand layer and rock stratum.Through changing the particle size distribution of abandoned sand in sandy soil layer,its influence on the performance of mortar was examined;furthermore,the influence of the particle shape of rock stratum waste sand on the performance of mortar was investigated,and the proportioning optimizing of synchronous mortar prepared from rock stratum waste sand was discussed.The results indicated that the sand layer waste sand can be used to replace the original sand directly,and the rock stratum waste sand can also satisfy the engineering requirements by adjusting the proportion;the fluidity of mortar improves with the increase of fineness modulus and sand content of sand layer waste sand,but excessive clay content results in decreased fluidity,shorter setting time and lower strength of mortar;the rougher the surface of rock stratum waste sand particles,the worse the fluidity and shorter the setting time.The waste sand of shield construction can be used for synchronous grouting under the appropriate proportioning,but the mortar proportioning should be adjusted appropriately with the change of particle size distribution and particle surface shape of waste sand.
作者
刘慧刚
丁建文
吉锋
高鹏举
廖赵胜
LIU Huigang;DING Jianwen;JI Feng;GAO Pengju;LIAO Zhaosheng(School of Transportation,Southeast University,Nanjing 210096,P.R.China;The Eastern Route of South-to-North Water Diversion Project Jiangsu Water Source Co.,Ltd.,Nanjing 210029,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2023年第6期134-142,共9页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(51978159)
国家科技支撑计划(2015BAB07B06)。
关键词
泥水盾构
废弃砂土
岩层弃砂
同步注浆
资源化利用
slurry shield
waste sand
rock stratum waste sand
synchronous grouting
recycling
