水泥水化作用对硬性浆液变形特性的影响  

Impact of cement hydration on deformation properties of cemented mortars

作　　者：袁小会[1] 韩月旺 钟小春[3] 

机构地区：[1]华北水利水电学院土木与交通学院,河南郑州450011 [2]郑州市轨道交通有限公司,河南郑州450046 [3]河海大学土木工程学院,江苏南京210098

出　　处：《华中科技大学学报（自然科学版）》2011年第5期51-54,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50908075)

摘　　要：通过选用不同水灰比和不同水化时间的硬性浆液,利用自制的浆液变形试验装置,针对盾构壁后注浆施工中常用的硬性浆液变形特性进行研究,探讨了水泥水化作用对硬性浆液变形的影响规律.结果表明:压缩应力越高,浆液产生的压缩变形量越大;随着浆液水灰比增加,水泥水化作用明显减弱,浆液的压缩变形量也随之增大;随水泥水化时间的延长,浆液的变形量呈减小趋势.在满足壁后注浆施工便利性和成本控制的条件下,适当地降低硬性浆液的水灰比,有利于控制由盾尾空隙闭合产生的地层沉降.By utilizing self-made grout deformation equipment, the cemented mortar deformation properties of shield backfill grouting were tested under different water-cement ratio and hydration time. The influence of hydration action on cemented mortar deformation was discussed. The results illustrate that the higher the consolidation pressure, the larger the compress variation of mortar generation. Cement hydration action is obviously weakened along with water-cement ratio increases, which lead to mortar deformation enlarging. With cement hydration time extend, mortar compress deformation presents decrease tendency. Therefore, during shield tunneling, water-cement ratio reasonable decrease is helpful to control stratum settlement induced by shield tail void closure under the conditions of backfill grouting implement convenience and cost controlling.

关 键 词：隧道 水泥 注浆 硬性浆液 水化作用 变形特性 

分 类 号：U451[建筑科学—桥梁与隧道工程]