关于高拱坝混凝土人工骨料原岩强度问题的讨论

Discussions on the Strength of Raw Rock of Artificial Aggregate for Concrete of High Arch Dam

以3个高拱坝工程为实例,对SL 251—2000《水利水电工程天然建筑材料勘察规程》中对骨料强度的判定值进行评价,认为其判定值不太科学。为此,建议应根据不同坝型区别对待,对于高拱坝混凝土骨料,原岩抗压强度应不小于混凝土强度等级的2.0倍,抗拉强度宜不小于混凝土抗拉强度设计值的1.5倍。

Taking three high arch dam projects as example, this paper assesses the strength of aggregate m the Specification on Investigation of Natural Building Material for Water Conservancy and Hydropower Engineering （SL 251-2000）and concluded that the dividing-line of the strength of aggregate is not scientific. The dividing-line should be established according to the type of the dam. If the aggregate is used in a high-arch dam, the strength of raw rock should be not less than twice as high as the strength degree of concrete ＆ the tensile strength of rock should be not less than 1.5 times as high as the tensile strength of concrete.