摘要
盾尾同步注浆区域位于盾构隧道管片壁后,由于其空间的封闭性,难以对浆液的扩散情况进行观测,从而导致目前同步注浆材料的分布特性尚不明确。为此,研发了一种盾尾同步注浆模拟装置,进行了盾尾同步注浆模拟试验研究,对同步注浆过程中的土体内部的压力变化与上部土体的沉降进行了研究。结果表明,注浆开始后出浆口移动轴线上方土体内部的压力在注浆压力的影响下逐渐增大,在出浆口远离后逐渐减小,与此同时轴线两侧的土体压力逐渐增大,产生了明显的土拱效应;注浆稳定后浆液的内部压力主要由上部荷载决定,与注浆阶段注浆压力的大小无直接关系;注浆过程中引发的地表沉降的大小主要由注浆压力决定,其次受到浆液性质的影响;凝固后的注浆体横向上在出浆口附近厚度较小,两侧较大,纵向上厚度分布较为均匀。
The shield tail synchronous grouting area is located behind the shield tunnel segment wall.Due to its closed space,it is difficult to directly observe the slurry diffusion,which leads to the unclear distribution characteristics of synchronous grouting materials.Therefore,a shield tail synchronous grouting simulation device was developed,and the shield tail synchronous grouting simulation test was carried out.The pressure change in the soil mass and the settlement of the upper soil mass during the synchronous grouting process were studied.The results show that the pressure in the soil above the moving axis of the grout outlet gradually increases under the influence of the grouting pressure after the grouting starts,and gradually decreases after the grout outlet is far away.At the same time,the soil pressure on both sides of the axis gradually increases,resulting in an obvious soil arching effect;The internal pressure of grout after grouting stability is mainly determined by the upper load,which has no direct relationship with the grouting pressure in the grouting stage;The surface settlement caused by grouting is mainly determined by the grouting pressure,and secondly affected by the slurry property;The thickness of solidified grouting body is smaller in the transverse direction near the grout outlet,larger on both sides,and the thickness distribution is more uniform in the longitudinal direction.
作者
黄大维
石海斌
罗仲睿
罗文俊
方焘
宋森
Huang Dawei;Shi Haibin;Luo Zhongrui;Luo Wenjun;Fang Tao;Song Sen(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;Jiangxi Key Laboratory of Disaster Prevention-Mitigation and Emergency Management,East China Jiaotong University,Nanchang 330013,China;Suzhou Rail Transit Company,Suzhou 215004,China;Shanghai Civil Engineering Group Co.,Ltd.,of CREC,Shanghai 201906,China)
出处
《华东交通大学学报》
2023年第3期1-9,共9页
Journal of East China Jiaotong University
基金
国家自然科学基金项目(52078213)
江西省杰出青年基金项目(20192ACBL21003)。
关键词
盾构隧道
同步注浆
模型试验
注浆压力
浆液扩散
shield tunnel
synchronous grouting
model test
grouting pressure
slurry diffusion
