坑内空洞の周囲に見られる岩盤の破壊に関する研究
1956 年 72 巻 818 号 p. 439-444
詳細
1956 年 72 巻 818 号 p. 439-444
The authors have carried out researches on the mechanism of the failure appearing in the rock around an underground opening, and have got results as follows. There appear two types of failure, tensile and compressive, when the theoretical maximum tensile and compressive stresses, determined on the basis of elastic rocks, reach values, 1.5-2 times the tensile strength and about 1.1 times the compressive strength respectively. The former failure grows into a tensile crack extending vertically, while the latter into a number of shearing fractures. Lastly the progress of the failures has been discussed, considering the results above mentioned and the mechanical properties of rocks, and somewhat a new concept about the progress of the failure has been presented.
