土压平衡盾构管片壁后同步双液浆开发及注浆效果研究
Synchronous Two-component Grout Development and Backfill Grouting Effect of EPB Shield
汪贵 1易斌斌 2李福东 1钟小春 2简永洲 1朱诚 3吴荣华4
作者信息
- 1. 中交二公局第四工程有限公司,河南 洛阳 471013
- 2. 河海大学土木与交通学院,江苏 南京 210098
- 3. 中交第二公路勘察设计研究院有限公司,湖北 武汉 430058
- 4. 中交隧道工程局有限公司,北京 100088
- 折叠
摘要
针对全断面稳定围岩地层管片上浮量过大的问题,通过将室内试验与现场试验相结合的方式,开发新型同步双液浆并应用于南京地铁 6 号线某区间,可大幅度减小管片上浮量、提高管片拼装质量.将现场使用的单液硬性浆作为A液,新型促凝剂作为B液,通过室内试验探究B液对于A液性质的影响规律,依据浆液胶凝时间、流动度及抗压强度要求并结合现场实际情况确定现场新型同步双液浆配比,最后通过现场试验检验该新型同步双液浆注浆效果.研究结果表明:1)B液掺A液总质量的 1%～2%,可使新型同步双液浆的胶凝时间缩短至 10～30 min,具有良好的泵送性及较高的早期强度;2)新型同步双液浆注入后 10 min内流动性不损失且不易堵管,在国内现有的施工管理水平下具有较大推广价值;3)监测数据表明,新型同步双液浆现场注浆效果优良,相比单液硬性浆,管片环整体上浮量减小 50%,管片环最大水平偏差减小 57%,管片环渗漏点数减少 50%,地表沉降最大值减小 74.3%.
Abstract
Aiming at the problem of excessive uplift of segment in full-section stable surrounding rock strata,a new type of synchronous two-component grout is developed and applied to a section of Nanjing metro line 6 through the combination of laboratory test and field test,which greatly reduces the uplift of segment and improves the quality of segment assembly.The single-liquid hard grout used in the field is used as liquid A,and the new coagulant is used as liquid B.The influence of liquid B on the properties of liquid A is determined by laboratory test.According to the requirements of slurry gel time,fluidity,compressive strength,and combined with the actual situation on site,the ratio of new synchronous two-component-liquid grout is determined.The grouting effect of the new synchronous two-component-liquid grout is verified by field test.The results show:(1)The gel time of the new synchronous two-component grout can be shortened to 10-30 minutes by mixing 1%-2%of the total mass of liquid A with liquid B.The slurry has good pumping performance and high early strength.(2)The fluidity of the new synchronous two-component grout can not be lost within 10 min after injection,and with good pumping perforrnance and not easy to block the pipe.(3)Monitoring data show that the new synchronous two-component grout has excellent field grouting effect.Compared with the single hard grout,the overall uplift of the segment ring is reduced by 50%,the maximum horizontal deviation of the segment ring is reduced by 57%,the number of leakage points of the segment ring is reduced by 50%,and the maximum surface settlement is reduced by 74.3%.
关键词
盾构隧道/管片上浮/现场试验/同步双液浆/胶凝时间Key words
tunnel engineering/segment uplifting/field test/synchronous two-component grout/gel time引用本文复制引用
基金项目
国家自然科学基金面上项目(52178387)
出版年
2024
NETL
NSTL
万方数据