紫坪铺水利枢纽工程地下洞室围岩渗透性评价(附答辩文稿)

摘 要 针对裂隙岩体的非均质性、各向异性特点，本次毕业设计对紫坪铺水利枢纽工程地下洞室开挖后洞壁裂隙结构面进行了几何参数测量和分组，再利用渗透张量理论计算各测量洞段渗透张量值，获得裂隙介质三维渗透张量场。最后，对渗透张量在量级、方位以及与洞深关系等方面的特征进行了系统分析，以此达到准确刻画岩体渗透性的目的。 分析结果表明，洞室围岩渗透性总体上较弱，且水平方向强于垂直方向，地下水将沿向斜轴向山外和两翼排泄。顺洞轴方向，渗透性与岩体结构有关，在山体两侧呈规律性的对称分布。所以，地下水将不会对整个工程造成太大的影响。 关键词： 紫坪铺 裂隙 渗透张量 地下洞室 The Permeability Evaluation of Underground Chamber Wall-rock in Zipingpu Hydraulic Project Abstract In the light of heterogeneity and anisotropy of rock mass permeability,the graduation project carried on fractured parameter measurement of geometry underground chamber after excavating in Zipingpu hydraulic project and divided fractures into groups. Then, the permeability tensor theory is utilized to calculate permeability tensor value of each measured chamber section in order to obtain crack medium three-dimension permeability tensor field. At last, to analysis permeability tensor characteristic roundly in quantity grade, position and the deep relation of chamber ,etc. The aim of describing accurately the permeability of rock mass is achieved. The analysis result presents that the permeability of wall-rock of chamber is generally weak, and permeability in horizontal direction is stronger than in vertical direction. The groundwater will drainage to external part of mountain and synclinal limb along the synclinal axis. While along the chamber’s axis direction, the permeability which distributes symmetrically has relation to the rock mass construction. So, the groundwater wouldn’t cause severe impact to the whole project. Key words: Zipingpu fracture permeability tensor underground chamber