摘要
在考虑渗流的情况下,运用FLAC3D软件,分析浅埋偏压隧道围岩在CRD法施工时物理力学状态的变化规律。结果表明:在开挖周围产生较集中的漏斗形状的孔隙水压力区域;地形的偏压造成隧洞右侧的应力大于左侧,随着CRD法的分步开挖,每步开挖后造成的导洞在拱顶、底板、边墙处横向均产生了应力集中,左洞在完全开挖与支护后,应力集中现象逐渐减少;在考虑渗流时第三步开挖对初始开挖处围岩变形影响最大;在CRD法开挖过程中,对围岩变形影响较大的是第七步;拱腰和拱顶发生的位移,在考虑渗流时大于未考虑渗流时的情况,但拱底出现与上述相反的现象。
Under the condition of considering the seepage, the shallow bias tunnel surrounding rock of the physical and mechanical state was analyzed by using FLAC3D software when the CRD method was used. The results show that the excavation surrounding formed dense funnel of pore water pressure area. Due to the bias of terrain, tunnel on the right side of the stress is larger than the left. With step-by-step excavation of CRD method, pilot tunnel produce stress concentration in the vault, floor, wall transverse, and the stress concentration phenomenon continues to weaken after complete excavation supporting left hole. The third step excavation has the biggest influence on the surrounding rock deformation with initial excavation with considering the seepage. In the whole excavation process, the seventh step excavation had the greatest influence on the deformation of surrounding rock. Vault and arch waist displacement with considering the seepage is larger than displacement without considering seepage, but the arch bottom displacement appeared to be the opposite phenomenon.
出处
《科学技术与工程》
北大核心
2016年第6期100-105,共6页
Science Technology and Engineering
基金
国家自然科学基金(51304084)
江西省自然科学基金(20151BAB206026)资助
关键词
CRD法
渗流
偏压隧道
数值模拟
CRD method numerical simulation seepage shallow-buried tunnel under unsymmetrical pressure
