‘Weak Rock - Soft, Fractured and Weathered Rock’, includes Volume. 3 of 3 of the Proceedings of the International Symposium on Weak Rock held in Tokyo on the 21-24 September 1981. Some of the papers presented at the symposium were as follows : Deformation of Crushed Rock Under Plane Strain Conditions ( Al - Hussaini , M ); Relation ... Takaaki , K ( McClelland Engineers Incorporated , Texas ) Journal of Geotechnical Engineering, as well as Weak Rock - Soft, Fractured and Weathered Rock’.