考虑时空效应的隧道工程黏弹性位移反分析  

Elastic-Visco Displacement Back Analysis in Tunnel Engineering Considering Temporal-Spatial Effects

作　　者：杨有海[1] 王长虹[2,3] 

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]同济大学地下建筑与工程系,上海200092 [3]上海建工集团技术中心,上海200083

出　　处：《地下空间与工程学报》2009年第3期468-472,629,共6页Chinese Journal of Underground Space and Engineering

摘　　要：工程材料受力变形的性态常与时间有关,这类现象一般称为材料变形的黏性效应,材料发生随时间而增长的变形时,如果始终处于弹性受力状态,则称发生的变形为黏弹性变形。结合乌鞘岭隧道穿越F7断层所取得的量测资料,将计算区域内的岩石视为均质各向同性体,初始地应力假设成均匀分布,采用三单元模型和工程实践及三维有限元分析结果,围岩变形规律通过引入位移释放系数考虑测点的时空效应,对有限元黏弹性问题进行优化反演分析,得出围岩区域内的水平侧压力系数和所使用模型中的弹性模量和黏滞系数,为挤压性断层中隧道的支护设计、施工组织提供可靠的依据。Usually, the loading-deformation character of material is connected with temporal variation, which is called as visco effects and the dispalcement is always kept in visco -elastic state. Combined with the measurement data from Wushaoling tunnel traversing the F7 fault, and taking the surround rock as isotropic body, the initial ground stress is postulated to be in well-proportioned distribution, the tri -element model was utilized. Moreover, according to the result of engineering practice and three dimensional FEM analysis, the displacement release coefficient was intreduced to consider the time-spatial effects of surround rock＇ s deforming characters. The optimum back analysis of elastic-visco finite element method proceeded. The results, include horizontal coefficient of lateral earth pressure, the elastic modulus and the coefficient of viscosity which provides the reliable basis for support designing and construction organizing in tunnel engineering with extrusion dislocation.

关 键 词：乌鞘岭隧道 F7断层 时空效应 黏弹性 位移反分析 流变 

分 类 号：TU921[建筑科学—建筑设计及理论]