软土盾构隧道横向大变形注浆治理长期效应研究  

A Study on the Long-term Effect of Grouting Treatment for Large Transverse Deformation of Shield Tunnels in Soft Soil

作　　者：牟公羽 张冬梅[2] MOU Gongyu;ZHANG Dongmei(Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,Shanghai 200092;Key Laboratory of Geotechnical and Subsurface Engineering of the Ministry of Education,College of Transportation Engineering,Tongji University,Shanghai 200092)

机构地区：[1]同济大学土木工程学院地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《现代隧道技术》2022年第4期147-157,共11页Modern Tunnelling Technology

基　　金：国家自然科学基金(41772295);上海市教委重大项目(2019-01-07-00-07-456 E00051)。

摘　　要：针对盾构隧道横向大变形注浆治理长期效应机理尚不明确的问题,结合上海地铁注浆治理案例,考虑水土耦合效应,利用虚拟膨胀应力法对不同注浆方式进行了数值模拟,揭示了固结期间的超孔隙水压力消散机理和隧道变形机理,得到超孔隙水压力消散对注浆长期效率的影响规律。研究发现,超孔隙水压力的消散分为局部超孔压力扩散和整体超孔隙水压力下降两种模式,不同消散模式对隧道变形的影响不同。隧道横向变形恢复量在固结初期较为稳定,随着超孔隙水压力下降,固结10~30 d后隧道变形恢复量进入快速回弹阶段,约100 d后逐渐减速达到稳定。注浆产生的超孔隙水压力分布模式是影响注浆长期效率最显著的因素。因此,通过改进注浆方法以改善注浆产生的超孔隙水压力分布,能有效提高隧道横向变形注浆治理的长期效果。This paper aims to address the problem that the long-term mechanism of grouting treatment for large transverse deformation of shield tunnels is still unclear. Based on the case of grouting treatment for the Shanghai metros and taking into considertation the coupling effect of water and soil, numerical simulations of different grouting methods are conducted by using the virtual swelling stress method. The study reveals the dissipation mechanism of excess pore water pressure and the deformation mechanism of the tunnel during the consolidation stage and unveils the patterns in the effects of excess pore water pressure dissipation on the long-term efficiency of grouting. It is found that the dissipation of excess pore water pressure could be divided into two modes: the diffusion of local excess pore pressure and the drop of the overall excess pore pressure, and different dissipation modes will have different effects on the tunnel deformation. The recovery of transverse deformation of the tunnel is relatively stable at the early stage of consolidation, and as the excess pore water pressure decreases, such recovery will enter a rapidly rebounding stage after 10~30 days of consolidation, and gradually decelerate to stability after about 100 days. The distribution pattern of the excess pore water pressure caused by grouting is the most significant factor that affects the long-term efficiency of grouting. Therefore, improving the grouting method as a way to improve the distribution of excess pore water pressure generated by grouting can effectively improve the long-term effect of grouting treatment for transverse tunnel deformation.

关 键 词：盾构隧道 软土 横向变形 注浆 长期效果 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]