摘要
地铁隧道盾构施工始发与到达段容易出现塌方、涌水(泥、砂)等工程事故,因此该区域地层的加固优化设计尤为关键.文中结合长株潭城际铁路树木岭盾构隧道始发段地层加固工程实际,首先采用弹性薄板理论计算不同安全系数下端头土体的纵向加固范围,并利用强度理论和滑移失稳理论对土体进行强度及稳定性验算;然后基于Terzaghi围岩压力理论确定浅埋盾构端头土体的横向加固范围,利用FLAC3D建模分析不同加固范围盾构施工对周边环境的影响,依据相关监测规程及设计文件要求,从经济性和稳定性角度确定优化后的端头土体加固范围,并应用到该工程中.优化后的数值模拟数据与实际监测结果吻合较好,说明优化后的设计方案是合理的.
As such accidents as landslide and water （mud, sand） gushing constantly occur in the starting and arri-ving stratums in the process of shield construction of subway tunnel, the reinforcing design of stratum in these areas should be optimized. In this paper, firstly, by taking the actual reinforcement in the starting stratum of the Shu- muling shield tunnel of Changsha-Zhuzhou-Xiangtan inter-city railway for example, the longitudinal reinforcement range of end soil under different safety factors was calculated in light of elastic thin plate theory, and the strength and stability of the soil were calculated by means of strength theory and sliding instability theory. Secondly, the transverse reinforcement range of end soil of shallow shield was determined by means of Terzaghi^ theory of rock pressure. Then, the influence of different reinforcement ranges on the surrounding environment was analyzed via FLAC3D modeling. Moreover, according to the relevant monitoring specifications and design documents, the opti-mized reinforcement range of end soil was determined from the viewpoints of economy and stability, and the opti-mized range was finally used in the actual engineering. The numerical simulation results accord with the actual mo-nitoring ones well, which means that the optimal design scheme is feasible.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第5期105-112,共8页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(41572275)
山东省自然科学基金资助项目(ZR2012EEM006)~~
关键词
土压平衡盾构
始发地层
加固优化
安全系数
数值模拟
earth-pressure balance shield
starting stratum
reinforcement optimization
safety factor
numerical simulation
