大理岩抗拉强度的离散性及与厚度的关系

Size effect and discreteness of splitting tensile strength of marble

大理岩劈裂抗拉强度具有较大的离散性,并受非均质性、劈裂形式及尺寸效应等多种因素影响.采用钢丝垫条形式的大理岩劈裂抗拉强度离散度小于采用钢平板形式的离散度;大理岩劈裂抗拉强度值越高,其离散度越小;采用钢丝垫条形式的劈裂抗拉强度在总趋势上随厚度的增加先增加后减小;而采用平板形式的劈裂抗拉强度随厚度的增加而减小.

Discreteness of splitting tensile strength of marble is very great and it is influenced by the factors such as heterogeneous,splitting type and size effect and so on.Discrete degree of splitting tensile strength with steel wire is less than that of splitting tensile strength with steel bearing plate;Discrete degree of splitting tensile strength is more smaller when the tensile strength become larger;When diameter of specimens is same and its thickness is different,the discrete degree of splitting tensile strength become smaller with increase of thickness.Size effect of splitting tensile strength with steel wire testing type is not distinct with increase of thickness,tensile strength firstly increases and then decreases;But size effect of splitting tensile strength with steel plate testing type is distinct,tensile strength decreases with the increase of thickness.