摘要
为了揭示黄土盾构隧道壁后注浆浆液在地层中的扩散形式和规律,考虑盾构隧道盾尾间隙特征,建立含水率、渗流压力、土压力可实时监测以及扩散过程可视的模型试验系统。考虑黄土不同含水率,通过试验研究浆液扩散形式以及注浆过程中的含水率、渗流压力和土压力变化规律。研究结果表明:在相同干密度下,不同含水率对壁后注浆浆液扩散形式影响显著;含水率为10%时,浆液未发生明显扩散,浆-土形成了明显的分界面,仅分界面处的含水率发生显著变化,各分层土体土压力较大;含水率为20%和30%时,浆液扩散范围增大,各分层土体含水率均有变化,土压力和渗流压力出现了阶跃曲线,土体中形成了明显的浆脉。黄土盾构隧道壁后注浆中浆液的扩散形式主要为压密扩散、压滤扩散和劈裂扩散。
To reveal the diffusion form and law of backfill grouting in shield tunnels of loess,considering the characteristics of shield tail,a model test system with real-time monitoring for moisture content,seepage pressure and soil pressure and visualization of diffusion process is established.Considering the different moisture contents of loess,the grout diffusion form and the variation law of moisture content,seepage pressure and soil pressure during grouting process are studied through the model tests.The results show that under the same dry density,different moisture contents have a significant effects on the diffusion form of backfill grouting.When the moisture content is 10%,the grout does not diffuse obviously,and an obvious interface is formed between the grout and soil.Only the moisture content at the interface changes significantly,and the soil pressure of each layer is large.When the moisture content is 20%and 30%,the grout diffusion range increases,the moisture content of each layer of soil changes,the soil pressure and seepage pressure show step curves,and obvious grout veins are formed in the soil.The grout diffusion forms in shield tunnels of loess are mainly compaction diffusion,pressure filtration diffusion and splitting diffusion.
作者
叶飞
李思翰
夏天晗
张才飞
韩兴博
YE Fei;LI Sihan;XIA Tianhan;ZHANG Caifei;HAN Xingbo(School of Highway,Chang’an University,Xi'an 710064,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2024年第10期2051-2059,共9页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51878060,52108360)
中国博士后科学基金项目(2020M683398)。
关键词
黄土盾构隧道
壁后注浆
模型试验
浆液扩散形式
shield tunnel of loess
backfill grouting
model test
grout diffusion form