摘要
依托某富水黄土隧洞,应用有限元分析软件对常水位作用不同工况下洞周围岩渗流场和位移场进行了模拟,对开挖过程中不同加固方式对洞周围岩的响应(渗流场、应力场和位移场)进行了研究。结果表明:洞周加固体的渗透性能对围岩的渗流路径、孔隙水压力和流速都有较大影响,对隧洞周围土体位移也有影响。在进行富水黄土隧洞注浆加固材料设计时,既要考虑材料的阻水效果,同时还要考虑加固体阻水后导致的土体孔隙水增加引起的土体抗剪强度的降低效应。
Taking a water-rich loess tunnel as an example, the FEM software was adopted to simulate the influence of different strengthening methods on mechanical response of tunnel surrounding soil （seepage field and stress field and deformation field） in water-rich loess tunnel excavation. The influence of flow field characteristics and displacement field characteristics caused by variation of grouting-reinforcement structure permeability coefficient in ordinary water level was also analyzed. The results show that the permeability coefficient of grouting-reinforcement structure play an important role in the seepage path, pore water pressure and seepage velocity. It also has impacts on the displacement of surrounding rock. Therefore designs of grouting-reinforcement structure of water-rich loess tunnel should consider impacts of seepage-stress coupling effect. First, the waterproofing effect of grouting-reinforcement structure should be considered, otherwise, it will avoid the pore water pressure increasing by increase of waterproofing effect of grouting-reinforcement structure and the soil shear strength will reduce.
出处
《水利与建筑工程学报》
2016年第2期172-177,共6页
Journal of Water Resources and Architectural Engineering
基金
山西省交通运输厅科研项目(2012-1-1)
山西省基础研究项目(2015021113)
关键词
渗流
富水黄土隧洞
加固
变形
seepage
water-rich loess tunnel
grouting-reinforcement
deformation
