水库蓄水后, 在一定空间范围内形成了应力场、应变场和渗流场。我们建立了一个数学一力学模型, 以描述水压应力场的特征。通过运用弹塑性岩土体非线性应力一应变和稳定性静力分析NOLM83二维有限元程序发现, 水库水压应力场的最大主应力从水库中心向两侧、从水库表面向深部逐渐降低。在此基础上, 研究了在未来三峡水库水压应力场影响下, 水田坝断裂的应力、应变和影响范围。研究表明, 平面影响范围为该断裂两侧5～-6km.由于岩体的浮托作用, 地表面的累积位移量少于10mm, 并向下逐渐减小。因此, 水田坝断裂完全能够承受三峡水库蓄水后产生的水压应力, 不会出现中-强度水库诱发地震, 不会影响三峡工程的安全。
After the water stotage of the reservoir, underground stress field, strain field and flow field are formed in a certain spatial range. A mathematical-mechanical model is set up to describe the characteristics of hydraulic pressure stress field. By applying the NOLM83 two-dimensional finite-element program for non-linear stress-strain and stability static force analysis of elastic-plastic rock-soil system, we find that the maximum principal stress of the reservoirs hydraulic pressure stress field decreases gradually from the center of the reservoir to its both sides and from the surface to the depth. The stress, strain, and the range of the Shuitianba fault affected by future hydraulic pressure stress at the reservoir are further studied. The result shows that the affected range in plane is about 5～6 km at the both sides of the fault. Due to the floating effect of rock mass, the cumulative displacement of the surface is less than 10 mm and decreases downwards. Therefore, the fault can fully withstand the hydraulic pressure stress induced by the water storage of the reservoir, and will not affect the safety of the ThreeGorges project since no moderate-strong reservoir-induced earthquake will occur.