岩心体积节理数J_(V)′计算方法

Calculation method of core volume joint number J_(V)′

岩体体积节理数J_(V)与岩体完整性指数K_V具有良好的对应关系,是用于定性表征岩石完整程度的重要参数~([1])。目前,相应规范中对J_(V)的计算方法已有了明确的定义。但是这种计算方法仅适用于野外体积较大的岩体(测线大于5 m)的J_(V)的计算,却不适用于钻探取出的岩心的体积节理数J_(V)′的计算。通过对岩体体积节理数J_(V)计算公式的变换,并对岩心中的节理数进行了钻遇率校正,最终得出了岩心体积节理数J_(V)′的计算方法。

The volume joint number J_(V) of rock mass has a good correspondence with the integrity index K_(V)of rock mass,and it is an important parameter for qualitative characterization of rock integrity[1].At present,the calculation method of J_(V) has been clearly defined in the corresponding specification.However,this method is only suitable for the calculation of the J_(V) of large rock mass(measuring line is more than 5 meters)in the field,but it is not suitable for the calculation of the volume joint number J_(V)′of core taken out by drilling.By changing the calculation formula J_(V) rock mass volume joint number,and correcting the number of joints in core,the calculation method of core volume joint number J_(V)′is finnally obtained in this paper.