This article provides an example to illustrate and explain the problem on borehole. Three boreholes are sunk at 3 points of an equilateral triangle whose sides are 480 m each. Is West of Q and R is North of midpoint PQ. Boreholes and R-reach the upper surface of a rich coal seam at 100 m, 220 m, and 260 m [...]
After reading this article you will learn about:- 1. Definition of Joint 2. Classification of Joints 3. Engineering Consideration. Definition of Joint: Joints are cracks or fracture present in the rocks along which there has been no displacement. Joints occur in all types of rocks. They may be vertical, inclines or even horizontal. Their dip and strike are measured in [...]
After reading this article you will learn about:- 1. Types of Unconformity 2. Field Evidences of Unconformities 3. Uses. Types of Unconformity: There are mainly three types of unconformity. They are: 1. Disconformity, 2. Angular unconformity, and 3. Nonconformity. 1. Disconformity: The rock beds on opposite sides of a disconformity are parallel as shown in Fig. 4.36. 2. Angular Unconformity: [...]