基于欧拉-拉格朗日耦合方法的盾构停机影响范围分析  

Analysis of the Influence Range of Shield Machine Shutdown Based on Euler-Lagrange Method

作　　者：阚绍德 瞿勇 翟利华 梁粤华 夏祎倩 傅金阳[2] KAN Shao-de;QU Yong;ZHAI Li-hua;LIANG Yue-hua;XIA Yi-qian;FU Jin-yang(Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,China;School of Civil Engineering,Central South University,Changsha 410075,China;Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University,Shanghai 201804,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广州510010 [2]中南大学土木工程学院,长沙410075 [3]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《科学技术与工程》2024年第32期14023-14032,共10页Science Technology and Engineering

基　　金：国家自然科学基金(52078496);广东省城市轨道交通工程建造新技术企业重点实验室资助项目(2017B030302009)。

摘　　要：盾构机在复杂地层中掘进时,常发生停机事故。既有相关案例的监测结果表明,盾构停机将加剧对周围地层的影响,甚至引起开挖面变形失稳。基于耦合欧拉-拉格朗日法(coupled Eulerian-Lagrangian,CEL),建立盾构隧道停机影响数值分析模型,研究盾构停机时刀盘前方地层土体在不同土舱填充率下的变形规律。结果表明:当填充率约为75%时,开挖面前方等效塑性应变和地层竖向位移变化率均发生突变,表明75%即为维持开挖面稳定性的临界土舱填充率。为减小盾构停机时对开挖面前方深层土体变形影响区范围,应保证盾构停机时土舱填充率,同时增大盾构在下穿既有地下工程前的安全检查距离。Shutdown accidents often occur when the shield machine is tunneling in complex strata.The monitoring results of existing related cases show that the shield shutdown will aggravate the impact on the surrounding strata,and even cause the deformation and instability of the excavation face.Based on the coupled Eulerian-Lagrangian(CEL)method,a numerical analysis model of the influence of shield tunnel shutdown was established,and the deformation law of the soil in front of the cutterhead under different soil chamber filling rates was studied.The results show that the surface subsidence results of numerical simulation are close to the measured data of monitoring points.When the filling rate is about 75%,the equivalent plastic strain in front of the excavation face and the vertical displacement change rate of the stratum are abruptly changed,indicating that 75%is the critical filling rate of the soil chamber to maintain the stability of the excavation face.In order to reduce the influence area of deep soil deformation in front of the excavation face when the shield is stopped,the filling rate of the soil chamber should be guaranteed when the shield is stopped,and the safety inspection distance of the shield before passing through the existing underground project should be increased.

关 键 词：土压平衡盾构 盾构停机 开挖面稳定性 地层沉降 

分 类 号：U459[建筑科学—桥梁与隧道工程]