摘要
在地下厂房洞室群自上而下进行开挖过程中,针对各洞室拱顶沉降位移随开挖步序是否发生回弹问题,基于施工力学分析方法,建立了模拟施工开挖过程的有限元列式。结合某地下厂房洞室群,在不同初始岩体地应力场下,分别针对单洞室和多洞室(洞室群)开挖过程进行数值仿真分析,基于各洞室拱顶沉降位移随开挖过程的变化规律,通过数值计算结果阐述这一疑虑,不论单洞室还是多洞室开挖,洞室拱顶沉降位移随开挖自上而下进行是否发生回弹与洞型和洞室布置以及岩体初始地应力场有关,在多洞室(洞室群)开挖情况下,各洞室拱顶沉降位移随开挖自上而下进行是否发生回弹的规律与单洞室开挖下的规律不尽相同。为地下工程的设计和合理支护时机提供理论依据。
In the excavating procedure of underground caverns from top to bottom,to solve the rebound problem of the subsidence displacement on the cavern with the excavation step,FEM formulae of construction excavation computation are established based on the analysis method of construction mechanics. For the caverns of the underground power house,the excavation process of the single cavern and the multiple caverns are analyzed by the numerical simulation in different initial stress fields. Based on change rules of subsidence displacement on the caverns with the excavation step,the rebound problem is solved by the results of numerical computation. Whether the excavation of single cavern or caverns,the rebound problem of the subsidence displacement on the cavern is related to the shape and arrangement of the caverns and the initial stress fields in the excavating procedure from top to bottom.In the multiplle caverns excavation case,the rebound change rules of the subsidence displacement on the cavern are different with that in case of excavation of single cavern. The theoretical basis is provided for underground engineering design and reasonable support time.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第S2期1911-1915,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金资助项目(51278169
50978083)
关键词
地下洞室
沉降位移
有限元
开挖模拟
数值仿真
underground cavern
subsidence displacement
FEM
excavating simulation
numerical simulation
