摘要
在地下工程施工建设过程中,隧洞开挖导致的施工巷道塌腔问题较为常见。基于我国某地下水封洞库工程施工巷道开挖过程中出现的施工巷道顶板塌腔情况,借助离散元数值仿真软件进行分析,研究出现塌腔后围岩变形特征及破坏机理。结果表明,随强度折减系数增加,围岩剪应变破坏区域逐渐增大,主要发生在拱顶及掌子面处,但未形成贯通至桩基础附近的破坏连通区域;施工巷道洞顶塌腔对围岩特征变量影响不大,施工过程中严格按照设计方案施工,不会对储罐基础产生较大不利影响;塌腔顶部仍为沉降位移最大的相对危险点,需要注意施工时是否会产生局部失稳现象。
During the construction of underground engineering,collapsing cavities in construction tunnels caused by tunnel excavation are common.In view of collapsing cavities in the roof of construction tunnels during the tunnel excavation of an underground watersealed cavern project in China,this paper studies the deformation characteristics and failure mechanism of surrounding rock after cavity collapse by the discrete element numerical simulation software.The results show that with the increase in strength reduction coefficient,the shear-strain failure zone of surrounding rock expands gradually,which mainly occurs at the vault and the tunnel face,but no failure connected zone through to the vicinity of the pile foundation is formed.The collapsing cavity in the roof of construction tunnels has little influence on the characteristic variables of the surrounding rock.The construction is strictly in accordance with the design scheme,which will not have a great adverse impact on the storage tank foundation;the top of the collapsing cavity is still the relatively dangerous point of maximum settlement displacement,and it is necessary to pay attention to whether local instability will occur during construction.
作者
黄昕
HUANG Xin(Sinopec Wanneng Natural Gas Co.,Ltd.,Hefei 230000,China)
出处
《石油工程建设》
2023年第3期37-41,共5页
Petroleum Engineering Construction
关键词
塌腔
储罐
离散元软件
collapsing cavity
storage tank
discrete element software
