摘要
对软弱围岩隧道施工中的力学性态进行了计算机模拟与分析。以杭新景高速公路白炭坞隧道为实体建模,采用有限元程序对其施工全过程进行三维弹塑性分析;重点分析不同的施工方法和支护方式对控制围岩变形的作用。计算结果表明:隧道的支护方式对减少由开挖引起的扰动起着重要作用,掌子面距离支护段距离越短,引起的沉降越小;对于软弱围岩,采用台阶法开挖时,台阶的长度不宜过长,一般应在0.5倍的洞径左右。
For tunneling in soft rock,the main problems are the evaluation and the control of deformations and stability of the excavation front,loads and stresses in the lining.Thus,in this paper,a 3D finite element model is applied to simulate the conventional procedure of tunnel excavation and lining.A number of Finite Element Method analyses were conducted to investigate the effects of the factors,such as distance between tunnel face and support,partial-face excavation and closure of invert,on the deformation of surrounding mass in soft rock.The results proved that the tunnel support lining is the most relevant single factor analyzed in reducing induced settlements.When the bench method is adopted in soft rock,the bench length should not be too long.
出处
《地下空间与工程学报》
CSCD
2007年第6期1114-1118,共5页
Chinese Journal of Underground Space and Engineering
基金
浙江省交通厅科技计划项目2005H048
关键词
隧道工程
软岩
施工方式
有限元
tunnelling
soft rock
excavation pattern
finite element
