考虑半渗透边界的隧道周围超孔隙水压力消散解

发布时间：2018-01-12 19:13

本文关键词：考虑半渗透边界的隧道周围超孔隙水压力消散解　出处：《岩土工程学报》2014年01期 　论文类型：期刊论文

【摘要】：通过引入衬砌半渗透边界条件,将Terzaghi-Rendulic固结理论和Burgers黏弹性模型相结合建立土体固结流变耦合模型,采用复变函数解法推导出求解黏弹性介质中半透水隧道周围超孔隙水压力的消散表达式,并以上海地铁二号线某区间隧道为工程背景分析了不同衬砌透水程度对隧道周围超孔隙水压力消散与分布的影响规律。研究发现,随着衬砌与土体相对渗透系数的增大,隧道外壁处超孔隙水压力的消散速度不断增快;隧道周围土体距离衬砌外壁越远,其初始超孔隙水压力越小,土体的超孔隙水压力消散速度也越慢。
[Abstract]:By introducing the semi-permeable boundary condition of lining, the Terzaghi-Rendulic consolidation theory and the Burgers viscoelastic model are combined to establish the soil consolidation and rheological coupling model. By using the complex variable function method, the dissipative expression of excess pore water pressure around semi-permeable tunnel in viscoelastic medium is derived. Based on the engineering background of a section tunnel of Shanghai Metro Line 2, the influence of different lining permeability on the dissipation and distribution of excess pore water pressure around the tunnel is analyzed. With the increase of the relative permeability coefficient of lining and soil, the dissipation rate of excess pore water pressure at the outer wall of tunnel increases rapidly. The further the soil around the tunnel is from the outer wall of the lining, the smaller the initial excess pore water pressure is, and the slower the dissipation rate of the soil excess pore water pressure is.
【作者单位】：中国建筑科学研究院地基基础研究所;建筑安全与环境国家重点实验室;同济大学地下建筑与工程系;
【分类号】：U452.11
【正文快照】： 0引言盾构机的开挖、剪切、挤压以及壁后注浆等作用,会对周围土层产生扰动,引起超孔隙水压力,超孔压的消散会导致隧道较大的长期沉降[1-2]。在软土地区,隧道的长期沉降尤为显著,这主要是由于其周围土体在变形过程中存在明显的固结和流变耦合作用。另外,隧道衬砌存在一定的渗透

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