铁道科学与工程学报2012，Vol.9Issue(4)：63-69,7.
地形偏压条件下隧道初始应力场及二次应力场分布特征
Secondary and primary stress distribution of terrain bias tunnel
摘要
Abstract
In order to obtain the distribution characteristics of primary and secondary stress field in terrain bias tunnel, the relationship among primary stress field and partial pressed angle and Poisson' s ratio was analyzed, and the distribution laws of secondary stress field along the radial and tangential direction in terrain bias tunnel were studied by theoretical derivation and calculation with typical values of engineering geology. The results show that terrain bias changes the stress field condition in compaison with the horizontal ground surface; shear stress appears in primary stress field and increases with the increase of the partial pressed angle; moreover, after the tunnel excavation, tensile stress appears in the secondary stress field when the partial pressed angle exceeds 20° and the stress on typical direction declines with the distance from tunnel center till to 2 times of tunnel span; the maximum shear stress under 30°partial pressed angle is twice of horizontal ground surface and occurs on vault, inverted arch and side wall, so these areas should be put emphasis on reinforcement.关键词
隧道工程/地形偏压/初始应力场/二次应力场Key words
tunnel engineering/ terrain bias/ primary stress field/ secondary stress field分类
交通工程引用本文复制引用
李文华,彭立敏,雷明锋,安永林..地形偏压条件下隧道初始应力场及二次应力场分布特征[J].铁道科学与工程学报,2012,9(4):63-69,7.基金项目
国家重点基础研究发展计划项目(2011CB013802) （2011CB013802）
国家自然科学基金资助项目(50808176) （50808176）
湖南省研究生创新基金项目(CX2010B094) （CX2010B094）
