Determination of effective anchorage length

Formula L = √(4ln10/t) distribution on anchorage interface for calculating the anchorage length. The influence to anchorage length caused by factors such as load, property of reinforced rock-soil body and radius of anchorage body was analyzed. The results show that under same conditions, the harder the rock, the smaller the anchorage length and the softer the rock, the larger the anchorage length. The anchorage length increases with the increase of the radius of anchorage body and decreases with the decrease of the radius of anchorage body. The anchorage length is nearly not influenced by drawing force and Poisson's ratio. A formula L ε = √(4ln10/t)+L was proposed for calculating effective anchorage length in view of various influencing factors, which was proven as practical by two case studies.