配比对盾构施工惰性浆液性能影响研究  

Influence of Proportioning on the Performance ofInert Slurry in Shield Tunnel Construction

作　　者：程雪松[1,2] 赵林嵩 郑刚[1,2] 索晓明 吴薪柳 CHENG Xuesong;ZHAO Linsong;ZHENG Gang;SUO Xiaoming;WU Xinliu(MOE Key Laboratory of Coast Civil Engineering Structure and Safety,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]天津大学滨海土木工程结构与安全教育部重点实验室,天津300072 [2]天津大学建筑工程学院,天津300072 [3]中国铁路设计集团有限公司,天津300308

出　　处：《重庆交通大学学报（自然科学版）》2023年第11期15-20,49,共7页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：中国国家铁路集团有限公司重点课题(N2020G009);国家自然科学基金项目(52178343)。

摘　　要：选择5因素(水胶比X_(1)、胶砂比X_(2)、粉灰比X_(3)、膨水比X_(4)、减胶比X_(5))、3水平开展惰性浆液正交试验,分析了各因素对的惰性浆液稠度(锥入度P)、凝结时间t_(s)、固结收缩率ε、28天抗压强度f 28及泌水率η等5个性能的影响规律;采用偏最小二乘回归(PLS)得到基于5个因素的惰性浆液各性能指标的回归公式,将各性能指标的PLS回归值与测试值进行对比以验证回归公式的合理性;在基准惰性浆液中分别掺入减水剂(减胶比X 5=0、0.002、0.004、0.006、0.008)和CMC增稠剂(掺量0、0.05%、0.10%、0.15%、0.20%),测得所制备惰性浆液的锥入度P、泌水率η、黏度μ和流动度F,分析了减水剂及CMC增稠剂的改性效果;讨论了惰性浆液的工程地质适用性。结果表明:水胶比对各个指标影响均较大,胶砂比对凝结时间、固结收缩率影响较大,膨水比与减胶比对锥入度、泌水率影响较大,粉灰比总体影响较小;PLS回归公式可用于惰性浆液配比的优化;浆液配比时,在保证稠度要求的前提下可加入适量减水剂以减小水胶比,也可添加适量CMC增稠剂来改善浆液黏度。Five factors(the water to binder ratio X 1,ratio of cementitious material to sand X_(2),ratio of fly ash to lime X_(3),ratio of bentonite to water X_(4),and ratio of water reducing agent to cementitious material X_(5)),and three levels were selected to conduct orthogonal experiments of inert slurry.The influence laws of various factors on the consistency(cone penetration P),setting time t_(s),and consolidation shrinkage rateε,28-day compressive strength f 28 and bleeding rateηof inert slurry were analyzed.Partial least squares regression(PLS)was used to obtain regression formulas for various performance indicators of inert slurry based on five factors.The PLS regression values of various performance indicators were compared with the test values to verify the rationality of the regression formula.In the experiment,water reducing agents(X 5=0,0.002,0.004,0.006,0.008)and CMC thickeners(dosage 0,0.05%,0.10%,0.15%,0.20%)were added to the reference inert slurry,and the cone penetration P,bleeding rateη,viscosityμ,and flowability F of the prepared inert slurry were measured.The modification effects of water reducing agents and CMC thickeners were analyzed,and the engineering geological applicability of inert slurry was discussed.The results show that the water to binder ratio has a significant impact on all indicators,the ratio of cementitious material to sand has a significant impact on the setting time and consolidation shrinkage rate,the ratio of bentonite to water and ratio of water reducing agent to cementitious material have a significant impact on the cone penetration and bleeding rate,and the overall impact of ratio of fly ash to lime is relatively small.The PLS regression formula can be used to optimize the proportion of inert slurry.When proportioning the slurry,an appropriate amount of water reducing agent can be added to reduce the water to binder ratio while ensuring the required consistency requirements.An appropriate amount of CMC thickener can also be added to improve the viscosity of the slurry.

关 键 词：隧道工程 惰性浆液 偏最小二乘回归 配比 

分 类 号：U455[建筑科学—桥梁与隧道工程]