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%。
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%.
