摘要
盾构在有地下水和无地下水地区开挖有很大的不同,特别是在高水位下施工时,因为渗透力的影响可能会引起工作面的不稳定,而在实际工程中,这种影响很少被考虑,从而低估了盾构施工的风险。本文根据渗流场和温度场的相似性,将ANSYS软件的温度场分析功能应用于渗流场的分析,并利用ANSYS软件自带的APDL参数化语言开发渗流力计算模块,渗透力首先在流场进行计算,然后将其作为应力边界条件施加于各节点进行应力和变形分析,探讨渗流力的存在对盾构隧道开挖面稳定的影响。基于此,作者提出一种考虑渗流的新的开挖面稳定性分析方法,使盾构水下掘进的设计施工更加合理。
The Shield tunnels driven in a water-saturated soil are different from the tunnels driven in a dry soil, especially excavating in the high groundwater area, since the instability of tunnel work face may occur. When the water table is above the tunnel, the seepage force acting on the tunnel work face is an important factor on workface instability. In the practical engineering application, the influence of seepage force was rarely taken account into the workface stability analysis of shield tunnel excavation, which may underestimate the danger during the shield tunnel construction. In this paper, according to similarity of the fundamental equations and boundary conditions between the temperature field and seepage flow field, the Numerical Simulation of the seepage flow field is carried out by the FEM software ANSYS function of temperature field analysis, and a seepage program is developed using program redevelopment language APDL of ANSYS. The seepage force will be calculated first in the flow field and then will be added to the stress field. Subsequently, the deformation around the tunnel workface can be achieved and the work face stability was analyzed considering the seepage. Based on the above procedure, the authors propose a newly method of face stability analysis considering the seepage flow which can make the design more suitable for underwater shield tunnel excavation.
出处
《上海地质》
2010年第B11期68-72,79,共6页
关键词
盾构
工作面稳定
渗流力
ANSYS
shield tunnel
work face stability
seepage force
ANSYS
