The Analysis on Joint and Fault of the Dike and its wall rock in the Lailai Area of Northeastern Taiwan

• Main Authors: Zheng-Hao Wang, 王證豪
• Other Authors: 羅偉
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/5av5j4

碩士 === 國立臺北科技大學 === 資源工程研究所 === 101 === The strata of Tatungshan formation is well exposed in Lailai area of the northeastern coast of Taiwan. The dominant lithological is interbedded units of gray sandstone and shale. The rock layer bedding direction is northeast-southwest. This area has many joints which shows of sandstone and shale. Affected by normal fault, thrust fault and strike-slip fault of the dike, caused by separation and movement. We investigated the difference of sandstone and shale of interbedded units on faults and joints under the action. This is known by at least four directions of faulting on dike. Respectively, we know the E-W, N-S and extending direction of dike. By the slickenside, tension cracks, Riedel shear structure, to determine the direction of sliding. The measured strike of joint to do histogram or contour diagram for statistical analysis. The analysis on faults and joints in field investigation results, divided into three stages. The first stage is 100°-115° direction of the compressive stress. The second stage is near the north-south of shear stress. The third stage is 85°-100° of shear stress and about 10° direction of extension stress.