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本文探讨了四川盆地含膏盐红层类岩溶作用引起的坝基工程地质问题,首先是地下水化学成分的改变及其对水工结构混凝土的腐蚀作用及坝基渗漏问题,然后确定了表征类岩溶作用强度的类岩溶强度因子(k)。最后,通过类岩溶岩体Vp与主要岩体工程力学指标,诸如:允许承载力fak、抗剪(断)摩擦系数f(f′)、变形模量(E0)的回归关系,探讨了类岩溶作用对坝基岩体弱化的作用。
This paper discusses the engineering geological problems of dam foundation caused by karstification of salt-bearing red mudstone in Sichuan Basin. The first is the change of chemical composition of groundwater, the corrosion of hydraulic concrete and the seepage of dam foundation, and then the characterization of karstification Strength-like karst strength factor (k). Finally, through the regression relationship between the Vp of the karst body and the engineering mechanics indexes of the main rock mass, such as the allowable bearing capacity fak, the shear friction coefficient f (f ’) and the deformation modulus (E0) Role of weakening of dam foundation rock mass.