摘要
针对土压平衡盾构改良渣土坍落度试验,从改良渣土合适坍落状态指标、改良渣土坍落度影响因素及机理、坍落度试验流变理论和坍落度试验数值仿真4个方面,详细剖析了国内外坍落度试验技术、理论与数值计算发展动态,总结既有研究不足,并提出了研究方向建议:基于坍落发展全过程提出渣土改良状态新型评价指标;探究泡沫衰变、渣土化学特性和矿物成分对坍落度的影响规律和内在机理;完善描述改良渣土坍落行为的流变理论模型,构建坍落度与流变参数的映射关系;研究改良渣土坍落度与带压状态流动行为及流变参数的联系。
During the tunnelling of earth pressure balance shields,it is often necessary to evaluate the physical and mechanical properties of the conditioned spoil so that the parameters can be adjusted in real-time to optimize the shield tunneling parameters and ensure safe and efficient construction.Due to different advantages,such as simple equipment,convenient operation and intuitive results,slump test has been widely used in the field to measure and determine the plastic fluidity of conditioned spoil.In terms of tests on the slump of conditioned spoil of earth pres⁃sure balance shields,this paper offers a detailed analysis of domestic and foreign test techniques for slumps and de⁃velopments in theory and numerical calculation,from the following four perspectives:the suitable slump state indica⁃tors for conditioned spoil,influence factors and mechanism of conditioned spoil slump,rheological theory and nu⁃merical simulation of slump tests,This paper also summarizes gaps in existing researches,and puts forward a propos⁃al for future research direction:to propose new evaluation indicators for spoil conditioning state based on the whole process of slump development;to investigate the impact laws of foam decay,chemical properties and mineral compo⁃sition of the spoils on the slump and the inherent mechanisms;to improve the rheological theoretical model for de⁃scribing the slumping behavior of conditioned spoil,and construct the mapping relationship between the slump and the rheological parameters;to investigate the relationship between the slump of conditioned spoil and flow behavior and rheological parameters under pressure.
作者
刘霆宇
王树英
钟嘉政
LIU Tingyu;WANG Shuying;ZHONG Jiazheng(School of Civil Engineering,Central South University,Changsha 410075;Tunnel and Underground Engineering Research Center,Central South University,Changsha 410075;Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures,Central South University,Changsha 410075)
出处
《现代隧道技术》
CSCD
北大核心
2023年第2期1-13,共13页
Modern Tunnelling Technology
基金
国家自然科学基金项目(52022112)
湖南省研究生科研创新项目(2020zzts152)。
关键词
土压平衡盾构
渣土改良
综述
坍落度
流变学
Earth pressure balance shield
spoil conditioning
Review
Slump
Rheology
