广汕铁路红花嶂隧道贯通.pdf

现 代 隧 道 技 术
隧道单层衬砌结构水压力特征研究
MODERN TUNNELLINineering, Southwest Jiaotong University, Chengdu 611756)
: There have been substantial research results on the material properties and structural stress state of tunnel
Abstract
single-layer lining. However, limited studies have been done on the distribution characteristics of water pressure. In
view of this, taking the single-layer shotcrete lining structure and composite sandwich lining structure as the re⁃
search subjects, this paper deduces the water pressure calculation formula to analyze the pattern of how different fac⁃
tors, such as permeability coefficient of the shotcrete layer and thickness of the single-layer lining, affect the water
pressure, based on the seepage continuity equation and Darcy′s law. The results show that: (1) when carrying out the
design of single-layer linings, measures should be taken to reduce the permeability coefficient of the surrounding
rock, such as surrounding rock grouting, and necessary drainage measures shall also be taken, without too much em⁃
phasis placed on the seepage resistance of the outer shotcrete layer, so as to reduce the water pressure of the single-
layer lining structure; (2) the thickness of the single-layer lining should be minimized as much as possible, with the
recommended thickne