The concrete wall would crack under design load

which is the fact and one of working principles in steel lined reinforced concrete penstocks. In order to release the contradiction between cracking and limiting crack width

model tests and FEM are adopted to study on some measures of crack control

and calculation method of crack width. The results show that cracking width would decrease when using more bars and thinner lining

that cracking width would decrease slowly when reducing the thickness of concrete wall

that waterproof painting has the better properties of cementation and deformation

and can be studied on improve durability of materials by long-term tests

and that the result using the calculation method in code П-780-83 to calculate crack width

is coincident with the result of model test.