テイメン マサツ シケン ト DDA ニヨル キレツセイ ガンバンナイ クウドウ ノ アンテイ ヘンケイ ヨソク

Construction of tunnels in cracked rocks is still a subject of numerous problems to be solved. The discontinuous deformation analysis (DDA) which was proposed by G. H. Shi (1984) is considered as a new technique by which the displacement and strain can be used to calculate the displacement and strain of any block system. This method is considered more practical than other conventional methods from the point of view of numerical analysis. This paper presents a rational plan and stability analysis of tunnel construction in cracked rocks based on the DDA together with the base friction test