摘要
深埋隧洞施工过程中,层状围岩在一定条件下会产生层间开裂,进而出现弯曲变形,如果变形过大,将产生严重后果。根据极限平衡受力分析,首先推导了层状围岩转化为板裂体的应力条件,用以判断围岩是属于材料破坏还是弯曲破坏。考虑到参数的随机性,构造出层状围岩产生弯曲结构变形的功能函数模型,并建立基于Monte-Carlo的随机有限元模型。实例分析表明,2种方法计算结果基本一致,而且都可以计算出围岩发生不同变形量的概率,比一般的确定性分析更加科学,为类似工程研究提供了一个参考。
In the construction of deep tunnel, stratified surrounding rock may crack at some conditions and further become bent, causing severe consequences if the bending deformation is large. The limit stress of conversion from stratified structure to slab-rent structure is derived by limit equilibrium analysis and used to distinguish the bending failure from material failure. Given the randomness of parameters, the state function model for the bending deformation of stratified surrounding rock is constructed and a stochastic FEM model is also constructed by Monte-Carlo method. The analysis of real cases indicates that the two methods have obtained basically the same calculation results and can both calculate the probability of different deformation amounts, giving more scientific results than common deterministic methods can, which can be a reference to other similar engineering study.
出处
《金属矿山》
CAS
北大核心
2009年第4期11-15,共5页
Metal Mine
基金
国家“十一五”科技支撑项目(编号:2006BAB04A06)
关键词
深埋隧洞
层状围岩
弯曲变形
随机有限元
Deep tunnel, Stratified surrounding rock, Bending deformation, Stochastic FEM
