大邱 地域의 砂岩 및 硅長岩에 對한 分離面의 活動性

Kinematic properties of discontinuities on the sandstone and felsite in Taegu province

The Cretaceous sandstone and felsite distributed in north-western border part of Taegu city were studied in the viewpoint of engineering geology with an emphasis of their discontinuities. The probability of continuity of sandstone is 0.69 and that of felsite is 0.56. The correlation coefficients of sandstone are 0.52 and 0.54. Those of felsite are 0.47 and 0.48. These values reflect that the rocks have been strongly jointed. K0 value of the sandstone is close to its Ka value and the test suggests that the sandstone has been in active state. On the other hand, K0 value of the felsite is close to its Kp value, which reflects that the felsite has been in passive state, in order to maintain the stability of the sandstone. δ value should be changed to be less than 13.2.