An analytical solution for design of pressure tunnels considering seepage loads
An analytical solution for design of pressure tunnels considering seepage loads
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DOI：
10.1016/j.apm.2018.05.032
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发表时间：
2018-10
影响因子：
5
通讯作者：
M. R. Zareifard
中科院分区：
文献类型：
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作者：
M. R. Zareifard
在具有透水衬砌的压力隧道中，隧道渗流的发展引起了周围地面和衬砌的渗透应力。本文基于广义有效应力原理，提出了一种用于压力隧道分析与设计的解析解。该问题是轴对称的，假定衬砌和岩体是多孔弹性的、均匀的和各向同性的。所提出的方法涵盖了无衬砌、喷射混凝土衬砌、混凝土衬砌、钢筋混凝土衬砌和预应力混凝土衬砌压力隧道等各种类型的压力隧道。对于无衬砌和无裂缝衬砌压力隧道，水力分析与力学响应无关；由此导出了应力、应变和孔隙压力的封闭表达式。另一方面，在裂缝钢筋混凝土衬砌中，裂缝的发展在力学和水力响应中得到了考虑。在这种情况下，水力和力学分析是耦合的；因此，水力和力学分析是通过迭代程序进行的。并通过一个算例说明了该方法在压力隧洞设计中的适用性。
In a pressure tunnel with a permeable lining, development of flow from the tunnel induces seepage stresses in the surrounding ground and the lining. In this paper, an analytical solution for analysis and design of pressure tunnels is presented, based on a generalized effective stress principle. The problem is considered as axial-symmetric, and the lining and the rock mass are assumed to be poroelastic, homogeneous and isotropic. The proposed method covers various types of pressure tunnels, such as unlined, shotcrete lined, concrete lined, reinforced concrete lined and prestressed concrete lined pressure tunnels. For unlined and uncracked lined pressure tunnels, the hydraulic analysis is independent of mechanical responses; thus, closed-form expressions for stresses, strains and pore pressure are derived.On the other hand, in cracked reinforced concrete linings, the development of cracks are considered in the mechanical and hydraulic responses. In this case, the hydraulic and mechanical analyses are coupled; therefore, the hydraulic and mechanical analyses are carried out by an iterative procedure. The applicability of the proposed solution for the design of pressure tunnels is illustrated and discussed by using an illustrative example problem.